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DESIGNE
D BY:
www.flexinnovations.com
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BEFORE CONTINUING WITH THIS INSTRUCTION MANUAL OR ASSEMBLY OF
YOUR TWIN OTTER 80E, PLEASE VISIT OUR WIKI SUPPORT SITE FOR THE LATEST
PRODUCT UPDATES, FEATURE CHANGES, MANUAL ADDENDUMS AND
FIRMWARE CHANGES FOR BOTH YOUR TWIN OTTER 80E AND THE INSTALLED
AURA 8 ADVANCED FLIGHT CONTROL SYSTEM.
wiki.flexinnovations.com/wiki/TwinOtter_80E
wiki.flexinnovations.com/wiki/Aura
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TABLE OF CONTENTS
Introduction 2 ....................................................................................................
Includes/Requires 2 .........................................................................................
Specifications 3 .................................................................................................
Completion Items 3 .........................................................................................
Optional Items 3 ...............................................................................................
Replacement Parts Listing 3 .........................................................................
Special Language Definition 4 .....................................................................
Important Information Regarding Warranty 4 .......................................
Safety Warnings and Precautions 4 ............................................................
Low Voltage Cutoff 4 .......................................................................................
Before you Begin 5 ...........................................................................................
Battery Charging Guidelines 5 .....................................................................
Main Landing Gear Installation 6 ................................................................
Nose Gear Installation 7 .................................................................................
Tail Installation 8 ...............................................................................................
Horizontal Stabilizer Installation 9 .............................................................
Motor Installation 10 .......................................................................................
Main Wing Installation 11 ..............................................................................
Main Wing Installation (continued) 12 .....................................................
Night Twin Otter 80E LED Connections 13 ..............................................
Connecting a Battery to the LED Controller 13 .....................................
Aura 8 AFCS 14 ..................................................................................................
Aura 8 Servo Connections 14 .......................................................................
Transmitter Setup 15 .......................................................................................
Receiver Installation 15 ..................................................................................
Connecting Your Receiver to Aura 16 .......................................................
Rudder and Elevator Linkage Installation 17 .........................................
Rudder and Elevator Linkage Installation (continued) 18 .................
Connecting Battery/Arming ESC 19 ..........................................................
ESC Throttle Calibration 19 ...........................................................................
Control Direction Test 20 ...............................................................................
Aura Sensor Direction Test 21 ......................................................................
Nose Cone, Cowling, Propeller and Spinner Installation 22 ..............
Battery Installation 23 .....................................................................................
Center of Gravity Verification 23 .................................................................
Pre-flight Checklist 24 .....................................................................................
AMA Safety Code 24 ........................................................................................
Twin Otter 80E Aura Optional Features Configuration 25 .................
Flying your Twin Otter 80E 26 ......................................................................
Airframe Repairs 27 .........................................................................................
Replacing Servos 27 ........................................................................................
Aircraft Troubleshooting Guide 28 .............................................................
Limited Warranty 29 ........................................................................................
Compliance Information for the European Union 29..........................
INTRODUCTION
The Flex Innovations Twin Otter 80E offers something incredible for everyone. At first glance, it is a
forgiving general twin engine aviation aircraft with rough field capabilities but take a deeper look
into the heart of the Twin Otter, and you’ll find its expansive capabilities. From wild 3D aerobatics, to
a gentle touch and the ability for land or water, this incredible aircraft offers a perfectly balanced
airframe for all flying styles
Combine such an incredible airframe with today’s most Advanced Flight Control System, the Aura 8
AFCS (included), and you’ll get an unmatched flying experience unavailable anywhere else. The twin
counter rotating motors cancel torque making the airplane more forgiving. When Aura is set to
Flight Mode 3, the gyro rudder gain and rate is looped to the motors providing unbelievable
additional stability in forward flight as well as in hovering flight. This differential thrust is also
coupled with the rudder control bringing aerobatic capabilities to the next level. The large flaps offer
incredible lift, allowing the Twin Otter to fly at “walking speeds”. Large control surfaces offer strong
control authority at all air speeds. Additionally, the Twin Otter 80E can also be equipped with floats
for flying off water.
The Twin Otter 80E is the go-to, all around perfect airplane for maximum fun, unthinkable aerobatics,
and minimal hassle. From sport flying, touch and goes, to 3D aerobatics, crazy yaw maneuvering and
float flying, the Twin Otter 80E is sure to be your favorite daily flier that can do it all! Available in day
and night version with LED lights pre-installed.
For the latest updates, features, addendums and more, before assembly, please visit:
wiki.flexinnovations.com/wiki/TwinOtter_80E
wiki.flexinnovations.com/wiki/Aura
•
Pre-installed and custom-tuned Aura 8
Advanced Flight Control System with
bounce-back control, preset Aura Flap
System and optional differential thrust.
•
2 X 40-size, 550kV motors and 60A ESCs
for big power.
•
(6) High-Precision Potenza DS34 servos.
•
Light wing loading for easy handling.
•
4.5-9 minute flight times depending on
battery choice and throttle
management.
•
Light Weight EPO foam that is durable
and easy to repair.
•
Ball-links on all control surfaces.
•
Removable battery tray for easy battery
installation.
INCLUDES
•
Twin Otter 80E airframe with decals applied.
•
Aura 8 Advanced Flight Control System (programmed and ready to use).
•
(2) Potenza 40-3D 550kv Brushless Motor.
•
(2) HobbyWing 60A ESC with 7A BEC.
•
(6) Potenza DS34 High Performance Digital Servo.
•
(1) Potenza DS15 High Performance Digital Servo.
REQUIRES
•
Minimum 8 channel computer transmitter.
•
5200mAh - 6200mAh 6S 22.2V 35C+ LiPo
(FPZB62006S40 recommended).
•
Serial capable receiver to match your transmitter, e.g.
Spektrum 4651T or Futaba R2001SB.
•
6S LiPo capable battery charger.
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SPECIFICATIONS
REPLACEMENT PARTS LISTING
FPM5070A
Twin Otter 80E: Super PNP Flex Army Scheme Day
FPM5080A
Twin Otter 80E: Super PNP Flex Army Scheme Night
FPM507001
Twin Otter 80E: Fuselage
FPM507002L
Twin Otter 80E: Left Wing Panel
FPM507002R
Twin Otter 80E: Right Wing Panel
FPM507003
Twin Otter 80E: Vertical Fin
FPM507004
Twin Otter 80E: Horizontal Stabilizer set
FPM507005
Twin Otter 80E: Motor Cowling Set
FPM507006
Twin Otter 80E: Nose
FPM507007
Twin Otter 80E: Main Landing Gear Wire
FPM507008
Twin Otter 80E: Main Landing Gear Mount w/Cover
FPM507009
Twin Otter 80E: Landing Gear Foam Fairing Set
FPM507010
Twin Otter 80E: Nose Landing Gear Wire
FPM507011
Twin Otter 80E: Nose Wheel Steering Assembly
FPM507012
Twin Otter 80E: Aileron and Flap Wire Harness (2)
FPM507013
Twin Otter 80E: Hardware package
FPM507014
Twin Otter 80E: Pushrod Set Assembly
FPM507015
Twin Otter 80E: Interplane Wing Struts Set
FPM507016
Twin Otter 80E: Y Harness ESC EC3/EC5 w/extensions
FPM507017
Twin Otter 80E: Left Spinner (CCW)
FPM507018
Twin Otter 80E: Right Spinner (CW)
FPM507019
Main and Nose Wheel Set
FPM507020
Twin Otter 80E: C/F Tube Set
FPM507021
Twin Otter 80E: Hatch set
FPM507022
Twin Otter 80E: Steering Tray Plywood Part
FPM507023
Twin Otter 80E: Wing Servo PCV Board Set
FPM507024
Twin Otter 80E: Float Set With Led Lights
FPM507025
Twin Otter 80E: Decal set Flex Army Scheme
FPM508001
Twin Otter 80E: Fuselage with LED Lights
FPM508002L
Twin Otter 80E: Left Wing Panel w/LED Lights
FPM508003
Twin Otter 80E: Right Wing w/ LED Lights
FPM508004
Twin Otter 80E: Vertical fin w/LED Lights
FPM508005
Twin Otter 80E: Horizontal Stabilizer set
FPM508006
Twin Otter 80E: Nose w/LED Lights
HW60AESC
HobbyWing 60A ESC with BEC
FPMPF146EL
Flex Innovation Wood Prop 14x6 Left (CW)
FPMPF146ER
Flex Innovation Wood Prop 14x6 Right (CCW)
FPZM10403D
Potenza 40 3D 550Kv Brushless Electric Motor
FPZDS34
DS34 Digital MG Mini Servo
FPZDS15
DS15 Sub-Micro Servo
FPZM10203D1
Potenza 20-3D Bolt On Prop Adapter
FPZM10403DCCW
Potenza 40-3D Bolt On Prop Adapter Left Threaded
FPZM10203D2
Potenza 20-3D Aluminum Motor Mount
FPZM10403D3
Potenza 40-3D Motor Shaft
FPZAURA8ZZOTTER
Aura 8 Advanced Flight Control System For Twin Otter
OPTIONAL ITEMS
FPM507024
Twin Otter 80E: Float Set with Led Lights
FPZ507025
Twin Otter 80E: Wing Bag Set
FPZB52006S40
Potenza 6S 5200mAh 40C LiPo Battery
FPZB62006S40
Potenza 6S 6200mAh 40C LiPo Battery
FPZB5003S25
Potenza 3S 500mAh 25C LiPo Battery (night flight)
SPMXC2000
Spektrum Smart S2100 G2 AC Charger 2X100W
SPMXBC100
Spektrum XBC100 Smart Lipo Battery Checker
SPM4651T
DSMX SRXL2 Serial Telemetry Receiver
SPMR8200
Spektrum NX8 Transmitter Only
FUTT6K
Futaba T6K Transmitter with R3006SB Rx Mode 2
FUTR2001SB
Futaba R2001SB SFHSS S-Bus
COMPLETION ITEMS
Potenza 40-3D 550 KV Brushless
Outrunner Motor (FPZM10403D )
HobbyWing 60A ESC (with BEC)
(HW60AESC )
Potenza DS34 Digital Metal Gear
Mini Servo (FPZDS34)
Aura 8 Advanced Flight Control
System For Twin Otter
(FPZAURA8ZZOTTER )
14 x 6 (x2) Wood Propeller, CW &
CCW (FPMPF146EL, FPMPF146ER)
NEEDED TO
COMPLETE
5200-6200mAh 6S 22.2V 35C+ LiPo
(FPZB52006S40, FPZB62006S40)
NEEDED TO
COMPLETE
8+ Channel Computer Transmitter
NEEDED TO
COMPLETE
RECEIVER
Serial-Capable Receiver (e.g.
Spektrum 4651T, Futaba R2001SB)
INSTALLED!
INSTALLED!
INSTALLED!
INSTALLED!
INCLUDED!
SPECIFICATIONS
Recommended battery – 6S 6200mAh 40C (FPZB62006S40) LiPo
90.0 in. (2286mm)
74.25in. (1886mm)
Day Version: 9.8lb (4450g)
Night Version: 10.0lb (45
35g)
RTF with 6S 6200mAh baery installed
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SPECIAL LANGUAGE DEFINITIONS
The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:
NOTICE:
Procedures, which if not properly followed, create a possibility of physical property damage AND a little or
no possibility of injury.
CAUTION:
Procedures, which if not properly followed, create the probability of physical property damage AND a
possibility of serious injury.
WARNING:
Procedures, which if not properly followed, create the probability of property damage, collateral damage,
and serious injury OR create a high probability of serious injury.
WARNING
AGES 14+
This product is not intended for
use by children under 14 years
without direct adult supervision.
ATTENTION
Read the ENTIRE instruction manual to become familiar with the features of the product
before operating. Failure to assemble or operate the product correctly can result in
damage to the product, personal property, and cause serious or fatal injury.
All instructions, warranties and other collateral documents are subject to change at the
sole discretion of Flex Innovations, LLC. For up-to-date product literature, please visit our
website at www.flexinnovations.com and click on the Twin Otter 80E and Aura 8 product
pages.
IMPORTANT INFORMATION REGARDING WARRANTY
Please read our Warranty and Liability Limitations section before building this product. If you as the Purchaser or user are not prepared to accept the
liability associated with the use of this Product, you are advised to return this Product immediately, in new and unused condition, to the place of
purchase.
SAFETY WARNINGS AND PRECAUTIONS
Protect yourself and others by following these basic safety guidelines.
1. This manual contains instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in the
manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
2. This model is not a toy, rather it is a sophisticated hobby product and must be operated with caution and common sense. This product requires
some basic mechanical ability. Failure to operate this product in a safe and responsible manner could result in injury or damage to the product or
other property.
3. This model must be assembled according to these instructions. Do not alter or modify the model outside of these instructions provided by Flex
Innovations, LLC, as doing so may render it unsafe and/or un-flyable. It is your responsibility to ensure the airworthiness of the model.
4. Inspect and check for the correct operation of the model and all its components before every flight.
5. If you are not an experienced pilot or have not flown a high-performance model before, it is recommended that you seek assistance from an
experienced pilot in your R/C club for your first flights. If you’re not a member of a club, the Academy of Model Aeronautics (AMA) has
information about clubs in your area whose membership includes experienced pilots.
6. Keep the propeller area clear from such items such as loose clothing, jewelry, long hair, or tools as they can become entangled. Keep your hands
and body parts away from the propeller as injury can occur.
7. Never fly in visible moisture or submerge the airplane or any of its electronic components in water. Permanent damage to electronic
components may occur, or corrosion of components may lead to intermittent failures.
LOW VOLTAGE CUTOFF
LiPo batteries have a nominal (rated) voltage of 3.7v per cell, and fully charged, reach 4.2v per cell. Batteries are designed to be discharged below the
nominal voltage, however, if they are discharged below 3.0v per cell, damage will occur and the pack will loose capacity. For best long term battery
life, set a timer and land after a time that leaves approximately 15% of the battery’s capacity remaining.
Low voltage cutoff is a feature that is built into the HobbyWing 60A ESCs that is designed to protect the connected battery from being discharged too
far and causing permanent damage to the cells. Circuitry within the ESCs will automatically detect when the input voltage from the battery pack
reaches below 3.0V per cell (average) and will remove power to the motor, but still deliver power to the servos so that a safe landing may be made. If
the motor begins to lose power rapidly during flight, the LVC has sensed that the total voltage of the pack has dropped below 3.0V per cell average,
and the airplane should be landed immediately.
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NOTICE
Do not use thread locker when attaching plastic parts, the parts will soften and fail.
BEFORE YOU BEGIN
WARNING
Follow all instructions provided by your battery and charger manufacturer. Failure to comply can result in fire.
We recommend the use of an advanced LiPo balancing charger, such as the Spektrum Smart S2100 G2 AC 2X100W Charger for your batteries to get the
maximum performance and lifespan from them.
Our airplanes are designed around our Potenza LiPo batteries, and we recommend the Potenza 6S 6200mAh 40C LiPo in the Twin Otter 80E based on
our extensive testing and development. These batteries feature an EC5 connector, so no soldering is required for use in your Twin Otter 80E.
All are available online at www.flexinnovations.com and your local Flex Innovations retailer.
BATTERY CHARGING GUIDELINES
NOTICE
If you have the night version of the Twin Otter 80E we recommend that you dry assemble the airframe and test all the lights before
bonding anything permanently in place.
NOTICE
The assembly of the Twin Otter 80E can be accomplished in less than one hour. Prior to assembling the airplane, it is advisable to charge
your battery so that you are ready to begin setup upon completion of the assembly of your model.
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MAIN LANDING GEAR INSTALLATION
Required Tools and Fasteners: #1 Phillips Screwdriver (4) M3x12 Phillips Head Self-Tapping Screw
1.5mm Hex Driver Blue Thread Locker
15 Minute Epoxy
1. Insert the wire landing gear into the slot in the fuselage. Insert the landing gear mount cover and secure using four M3x12mm self tapping screws.
2. Mount the wheels to the end of the landing gear with a wheel collet on each side of each wheel. Use thread locker on all the set screws.
3. Glue the foam fairings to the landing gear wire leaving a 1-2mm gap to the fuselage to allow for landing gear wire movement. We recommend using
15 minute Epoxy.
(QTY 4)
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NOSE GEAR INSTALLATION
Required Tools and Fasteners: 1.5mm Hex Driver #1 Phillips Screwdriver
15-Minute Epoxy Craft Sticks (for mixing epoxy)
Mixing Cup Paper Towels
Thread Locker
1. Find the nose gear steering servo tray and test fit it. Once you are happy with the fit make sure surfaces all are clean and then bond the tray in place
with Epoxy adhesive. Fix it in place while the adhesive dries. Ensure that the adhesive is completely dry before proceeding.
2. Mount the wheel to the end of the nose gear strut with a wheel collet on each side of the wheel. Use thread locker on all the set screws.
3. Install the nose gear strut to the airplane with a wheel collet in the middle of each of the mounts. The steering arm goes on top of the assembly. Use
thread locker on all set screws. View picture to the right for assembly details.
4. The servo arm should be pre-installed, ensure that the push-rod is crossed over as in the picture below. Connect the servo lead to the Y-harness on
port S8 of the Aura (rudder). Once the radio is set up return to this assembly and ensure that the nose wheel is properly centered.
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TAIL INSTALLATION
Required Tools and Fasteners: 30-Minute Epoxy 220 Grit Sandpaper
Craft Sticks (for mixing epoxy) Paper Towels
Mixing Cup Isopropyl Alcohol
Low-tack Painters tape
The tail assembly uses the short carbon fiber rod for reinforcement.
1. Dry fit the tail assembly and reinforcement rod to the fuselage. If you have the night version test the lights to ensure that they work before bonding
anything permanently.
2. Once everything fits correctly, remove the carbon fiber rod and lightly scuff it with 220 grit sandpaper to aid in adhesion. Clean all surfaces with
Isopropyl alcohol before bonding.
3. If you have the night version first connect the LEDs. Bond the tail assembly to the fuselage using 30-minute epoxy. Ensure that you get adhesive on
all the mating surfaces as well as both ends of the carbon fiber rod.
4. Insert the horizontal stab tube and the wing tube into the airplane, ensure that they are parallel before taping the tail section to the fuselage, this
step is critical or the airplane will not end up straight.
5. Tape the assembly in place with low-tack painters tape while the adhesive dries.
Note: Do not apply tape directly to any painted part as this will strip the paint off the part, place the tape only on the white areas.
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HORIZONTAL STABILIZER INSTALLATION
Required Tools and Fasteners: #1 Phillips Screwdriver (4) M3x8 Phillips Head Self-Tapping Screw
1. Insert and roughly center the carbon fiber horizontal stabilizer tube in the fuselage.
2. Insert both halves of the horizontal stabilizer onto the tube. Ensure that the control horn faces the bottom of the fuselage and that the elevator
jointer tabs line up properly.
3. If you have the night version, connect the LED power connectors.
4. Once both halves of the horizontal stabilizer are seated in place, secure them using four M3x8mm self tapping screws.
(QTY 4)
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MOTOR INSTALLATION
Required Tools and Fasteners: Motor Assembly (4) M4x8 Phillips Flat Head Screw
Prop Adapter Assembly 2.5mm Hex Driver
(4) M3x10 Socket Head Cap Screw #2 Phillips Screwdriver
(4) M3x22 Phillips Button Head Screw Blue Thread Lock
1. Install the x-braces on the back of the motors using four M4x6mm flat head screws and thread locker.
2. Install the prop adapters on the front of the motors using the provided socket head hex screws and thread locker.
3. Mount the motors to the nacelles using four M3x22mm button head screws and thread locker. Note that the prop adapters are threaded for the
appropriate propeller rotation. When viewed from the rear of the airplane, the black prop adapter (normal or right handed thread) is used on the
right wing (CW) and the silver prop adapter (reverse or left handed thread) is used on the left wing (CCW).
4. Temporarily remove the ESC covers and connect the the three motor leads to the ESC leads inside the
nacelles (when you test the motors, if they spins in the wrong direction you can reverse the direction of rotation by swapping any two leads).
5. Note: Do NOT install the motor cowlings or the propellers at this point, these will be installed after radio setup and testing is complete.
(QTY 4) (QTY 4) (QTY 4)
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MAIN WING INSTALLATION
Required Tools and Fasteners: (4) M4x18 Thumb Machine Screw #2 Phillips Screwdriver
Blue Thread Lock
1. Install and secure a wing strut on each one of the wing nacelles using a pin keeper. Do not fly the Twin Otter 80E without the wing struts, they are
a critical structural component that is required due to the motors and nacelles being on the wings.
2. Remove the hatch from the fuselage.
3. Insert and roughly center the carbon fiber wing tube in the fuselage.
4. Slide the left and right wing panels onto the tube. Ensure the servos orient towards the bottom of the fuselage.
5. Connect the single wing connector from each wing panel to the provided wing harnesses and run the servo wires through the corresponding
opening into the fuselage.
6. Run the motor power lead (with the EC3 connector) into the fuselage through the corresponding opening in the fuselage.
7. If you have the night version, run the LED power connectors into the fuselage through the corresponding openings in the fuselage.
8. Seat the wings completely in the wing saddles and secure the wings using the thumb screws through the aluminum tabs. Since the Twin Otter
80E has the motors and nacelles on the wings, and as such carry more weight on the wings, it is important that the wings are secure. For that
reason tighten the wing screws using a Phillips screwdriver before each flight.
WARNING
REMOVE THE AILERON AND FLAP SERVO ARM RETAINING SCREWS (NOT THE MOUNTING SCREWS) AND APPLY BLUE
THREAD LOCK TO THE SCREWS. RE-INSTALL THE SCREWS AND TIGHTEN FULLY. FAILURE TO DO SO MAY RESULT IN A CRASH
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MAIN WING INSTALLATION (CONTINUED)
9. Connect the wing harness servo wires to the Aura as specified in the table on page 14 of this guide.
10. Connect each power lead to one end of the provided power lead Y-harness (2 EC3 connectors and 1 EC5 connector).
11. If you have the night version, connect the LED power connectors to the light controller. The two spare leads are used by the optional night floats.
12. Fasten the wing struts to the fuselage using the retaining pins and pin keepers.
The two spare JST connectors
are for the floats.
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NIGHT TWIN OTTER 80E LED CONNECTIONS
If you have purchased the Night version of the Twin Otter 80E, this page will cover all LED light connections. If you did not purchase the night version,
skip ahead to the next page.
1. The first connection for the LED lights is under the carbon tube in the tail junction. This connection is made once before the tail is bonded in place.
2. There is a connection for each horizontal stabilizer half. Connect each one of these connectors the horizontal stab half while installing them.
3. There is a connection for each wing panel and a connection for each float coming out of the wing. While installing the wings route these
connectors into the fuselage through the opening provided for them. Connect each one of the two power connectors to the two unused leads in
the LED controller.
4. The nose cone has LED lights, connect these to the LED wire that is routed to the nose of the plane.
5. If using the floats with lights, connect each connector for the float set to the spare leads coming into the fuselage from the wings. You will need to
cut a hole in the bottom of the fuselage to route the LED wires coming from the floats. For details on where to cut this hole refer to the installation
manual for the Twin Otter floats. Secure the wires to the strut and fuselage using water proof tape.
LED
CONTROLLER
3S Li-Po
Black/Negative Lead
CONNECTING A BATTERY TO THE LED CONTROLLER
The LEDs on your aircraft are switchable via the transmitter, and are designed to be powered by 12 volts (3S LiPo) through the 6S JST-XH balance tab on
the LED controller. By default, the LED controller is left unplugged. If the servo lead of the LED controller is not plugged into the Aura or a
receiver, the LED controller will default in the ON position when powered, allowing the Night Version to be flown at night with a basic 8-
channel transmitter or receiver.
IN ORDER TO CONTROL THE LEDS FROM THE TRANSMITTER, YOU MUST USE A STANDARD RECEIVER THAT IS CAPABLE OF 9+ CHANNELS, AND
KEEPS THE SERVO PORTS ACTIVE WHEN USING A DIGITAL DATA STREAM (like S.Bus, SRXL2 etc.).
WARNING
You MUST use an independent 3S LiPo battery to power the LEDs in the Twin Otter 80E. Failure to do so can damage your flight batteries. We
recommend the use of the Potenza 3S 2200mAh 45C LiPo (FPZB22003S45) or the Potenza 3S 500mAh 25C LiPo (FPZB5003S25).
WARNING
Do not leave the battery plugged into the LED controller for extended periods of time. Doing so can damage the battery. Average current draw for the
lighting system is 2.2A/h
NOTICE
If you have the night version of the Twin Otter 80E we recommend that you dry assemble the airframe and test all the lights before
bonding anything permanently in place.
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AURA 8 AFCS
The Aura 8 AFCS (Advanced Flight Control System) comes programmed and pre-installed in your Twin Otter 80E, making setup a breeze. This highlyrefined 3-axis gyro makes the Twin Otter 80E fly like it is a larger aircraft and in less wind. Thanks to the Aura’s advanced implementation, it not only
enhances the flying experience, but it never interferes with the pilot’s control.
The Aura 8 AFCS comes configured with Flight Modes (dual rates, expos and gyro settings) set by the Flex Innovations team, and offers a great starting
point for most pilots. Since these are already configured for you in the Aura, there is no need to set up dual rates, expos or flaps in your
transmitter. Simply follow the Transmitter Configuration Guide in this manual for complete details on the transmitter programming required for the
Twin Otter 80E and Aura 8 AFCS.
Visit wiki.flexinnovations.com/wiki/Aura for the latest Aura-related product information and updates.
The following shows the pre-configured Aura flight modes in the Twin Otter 80E.
Twin Otter 80E Aura Profile
Flight Mode 1: Sport (Gyro Off)
• For safety only, do not fly in this mode unless you suspect that the gyro is behaving incorrectly or erratically.
• Rates and Expos are tuned for general flying.
• Live Wing (flaps coupled to ailerons) is inactive.
• Gyro is set to off.
Flight Mode 2: Sport (Gyro On)
• For sport flying and for all taxying on the ground.
• Rates and expos are tuned for sport flying.
• Live Wing is active.
• Gyro is set to low.
Flight Mode 3: Advanced (Gyro On)
• For advanced aerobatic flight, note: do not taxi in this mode.
• Rates are highest and expos are tuned for 3D flight.
• Live Wing is active.
• Differential thrust is used (if enabled via switch).
• Gyro is set to moderately high.
In all flight modes, the flaps function with the operation of CH6 (Aux 1) on the transmitter.
NOTE - Rudder stick movement will also move the ailerons and elevator. Flap (CH6) movement will also move the elevator. This is NORMAL and is
the pre-programmed mixing.
Each of the modes has been tuned by our team to offer a solid start. Because tastes in control feel are unique, if changes in rate, expo or gains are
needed, adjustments can be made through Aura. We highly recommend that you do not change any of these in your transmitter.
The Aura 8 AFCS Profile for the Twin Otter 80E can be enhanced with optional features without the need of a computer. For further details, please see
the section of this manual titled Twin Otter 80E Aura Optional Features Configuration on page 25.
DEFAULT AURA CONNECTIONS
S1 – Left Throttle
S2 - Right Throttle
S3 – Left Aileron
S4 – Right Aileron
S5 – Elevator
S6 – Rudder
S7 – Left Flap
S8 – Right Flap
Port B – Serial Receiver Input
Mini Port A&B – Remote Receiver Inputs
Mini Port A
Mini Port B
Micro USB Port
Port B
AURA 8 SERVO CONNECTIONS
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TRANSMITTER SETUP
The included Aura 8 is designed to work seamlessly with all popular transmitter and receiver brands, however, transmitter setup is significantly
different than when setting up a model without Aura. Follow these steps:
1. Start with a new model memory in your transmitter. Reset it to be certain it is set to defaults.
2. Adjust your transmitter settings according to the Transmitter Configuration Guide below.
3. Make ONLY the changes shown in the Transmitter Configuration Guide. No other changes are required.
Transmitter Configuration Guide
Spektrum, Futaba, JR ¹ &
Graupner
FrSky
Jeti (EX-Bus)
Wing/Tail Type
1 Aileron, 1 Elevator, 1
Rudder
1 Aileron, 1 Elevator, 1
Rudder
1 Aileron, 1 Elevator, 1
Rudder
End Points
(Travel Adjust or ATV)
Ail/Ele/Rud – 125%
Ail/Ele/Rud – 100%
Aileron/Ele/Rud – 100%
Thro/CH5/CH6 – 100%
Thro/CH5/CH6 – 84%
Thro/CH5/CH6 – 80%
Reversing ²
Not Allowed
Sub-Trim
Verify at Zero, NOT ALLOWED
Trim Levers
Verify at Zero
CH5 (Gear) – Flight Mode
Assign to a 3 Position Switch
CH6 (Aux 1) – Flaps
Assign to a 3 Position Switch
(Do NOT use Transmitter Flap System)
CH7 (Aux 2) – Differential
Thrust On/Off
Assign to a 2 Position Switch
(We recommend that you use the same switch as you use for throttle cut)
CH8 (Aux 3) – Crow ³
Assign to a 2 Position Switch
First Flight Timer
4
For your first flight, set to 4:30
1 JR customers should use JR XBUS Mode A, and follow the chart above. This is the preferred JR DMSS connection to Aura.
2 If you are using a Futaba transmitter, please note that some Futaba transmitters have the throttle set to reversed by default. We recommend that
you leave the reversing set to the defaults and reverse it if needed after testing. NOTE: do all throttle testing with the props removed!
3 The default Aura program has Crow disabled, please see the section of this manual titled Twin Otter 80E Aura Optional Features Configuration
on page 25 to enable Crow.
4 This time is a safe starting point for most pilots. This aircraft can typically fly anywhere between 4.5 to 9 minutes (with 6S 6200mAh LiPo),
depending on an individual’s flying style.
FOR CUSTOMERS USING TRANSMITTERS OTHER THAN WHAT IS LISTED IN THE CHART ABOVE, PLEASE VISIT OUR WIKI PAGE
FOR INSTRUCTIONS SPECIFIC TO YOUR TRANSMITTER AND RECEIVER BRAND
HITEC – wiki.flexinnovations.com/wiki/Aura/HitecSbusUse
RECEIVER INSTALLATION
Choosing a Receiver
Aura will auto-detect modern serial receiver connections. For use in the Twin Otter 80E, only a serial receiver connection or two Spektrum
Remote Receivers can be used. Below are a few examples of serial receivers that can be used with the Aura 8. This is not a complete list of
compatible receivers, rather a short list to assist in your receiver selection.
Spektrum Remote Receivers – SPM9745 (2 Required)
Spektrum SRXL – SPMAR6610T, SPMAR8020T, SPMAR10100T
Spektrum SRXL2 – SPM4651T, SPM4650
Futaba S.Bus – Futaba R7008SB, R2001SB, R6202SBW
Hitec S.Bus – Optima SL, Maxima SL
FrSky S.Bus – RX4R, RX6R
Graupner HoTT (Sum D of 8) – GR12L, GR16L
JR XBus (Mode A & Mode B) – RG012BX, RG613BX, RG821BX
Jeti EX-Bus – REX10, R9 EX, REX6
Page 17
16
Note: SRXL2 receivers like the
4651T require the use of a
different cable to connect to
Aura. The cable is included with
the receiver when it is purchased
directly from Flex Innovations.
You can also purchase the cable
itself at flexinnovations.com
(FPZA1039). Other receivers like
the AR6610T provide a standard
servo port for the SRXL2 signal.
Serial Receivers
If using a standard serial receiver, connect the provided male to male cable to
your receiver’s serial port. Connect the other end of the cable to Aura Port B
noting proper polarity.
Note: If you are using Futaba
S.Bus, be sure to use the
proper S.Bus port in your
receiver. DO NOT use the
S.Bus2 port, as it is not
supported for use with the
Aura 8. Refer to your
manufacturer's instructions
for proper S.Bus use.
Note: When using Spektrum SRXL or SRXL2 to connect to the Aura, always
connect the remote receivers to the Spektrum receiver, NOT to the Aura.
4651T
ESC
-
+
-
+
ESC
Binding Your Receiver
Bind your receiver to your transmitter per your receiver and transmitter
manufacturer’s instructions.
CONNECTING YOUR RECEIVER TO AURA
Spektrum Remote Receivers
If using two Spektrum Remote Receivers, connect them to
Aura Mini Port A and Mini Port B using the cable provided
with your receivers.
Binding Your DSMX Remote Receivers
1. With the transmitter and aircraft powered OFF, place a
bind plug into Aura Port S8.
2. Power on the aircraft. Your remote receivers should flash
rapidly, indicating it is in bind mode.
3. Bind your transmitter to the remote receivers per your
transmitter manufacturer’s instructions. This is typically
done by pressing and holding the bind button on your
Spektrum transmitter while powering it on.
4. Verify the receivers are bound by looking at the LED on
the Remote Receivers. This is typically indicated by a
solid orange LED on Spektrum Remote Receivers.
5. Remove the bind plug from Aura Port S8.
Aura 8 Auto-Detect
Note: Before powering up the airplane for the first time ensure that there is not trim or sub-trim on any of your main channels (aileron,
elevator or rudder) as this may lead the Aura 8 Auto-Detect feature to fail or work improperly. Once your receiver is bound, powered, and
connected to the Aura, the Aura will begin the Auto-Detect process to learn what type of receiver you are using and set itself up for that specific
system. Auto-Detect is indicated by a series of sweeping LEDs of various colors. After Auto-Detect is completed, verify that Aura is on and receiving
data from your receiver by looking at the LEDs on the Aura.
Ready-To-Fly:
Solid Orange LED: Aura On and Calibrated
Solid Green LED: Aura receiving Valid receiver data
Possible Errors:
Flashing Orange LED: Aura Moved During Power Up
No Green LED: Aura NOT receiving receiver data
Page 18
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RUDDER AND ELEVATOR LINKAGE INSTALLATION
Required Tools and Fasteners: Elevator and Rudder Pushrod Assemblies #2 Phillips Screwdriver
(4) M2x10 Phillips Head Machine Screw #0 Phillips Screwdriver
(4) M2 Flat Washer Needle-Nosed Pliers (or Hemostats)
(4) M2 Lock Nut Blue Thread Lock
(2) M3x6 Phillips Head Machine Screw
1. Locate the rudder and elevator pushrod assemblies, as well as the servo arms and hardware. Note the shorter pushrod is for the elevator and the
longer one is for the rudder.
2. Power on your transmitter, and power on the airplane. Once the Aura 8 has initialized and you can verify that the servos are operating properly. Set
the flight mode to FM1before making any adjustments to servo arm positions or to pushrod lengths. This will disable the Gyro and ensure that the
control surfaces are centered and don’t have any motion if the airplane is accidentally moved.
3. With the aircraft still powered on, install the rudder and elevator servo arms perpendicular to the servo case, being sure to orient the servo arm
towards the top of the fuselage for the elevator and towards the bottom of the fuselage for the rudder (as shown below). Apply blue thread lock to
the M3x6 Phillips head machine screw, and secure the servo arm in place with a #2 Phillips screwdriver.
(QTY 4) (QTY 4) (QTY 4) (QTY 2)
WARNING
DUE TO VARIANCES IN PRODUCTION AND THE LARGE CONTROL SURFACE THROWS ON THIS AIRCRAFT, PROPER SERVO CENTERING AND
TRAVEL ADJUSTMENT IS CRITICAL TO PREVENT SERVO OVER TRAVEL AND FAILURE. IF THE SERVO ARMS ON YOUR AIRCRAFT DO NOT SIT
PERPENDICULAR TO THE SERVO CASE, YOU MUST USE THE AURA CONFIG TOOL TO ADJUST THE SUB-TRIM AND OUTPUT SCALE VALUES TO
PREVENT OVER TRAVEL OF THE SERVOS.
To download the Aura Config Tool, please visit: https://www.flexinnovations.com/aura-config-tool-install/
Page 19
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RUDDER AND ELEVATOR LINKAGE INSTALLATION (CONTINUED)
4. Use a #0 Phillips screwdriver, M2x10 machine screw, M2 washer and M2 lock nut to secure the linkage to the control horn and servo arm. Use the
diagrams below for proper control horn and servo arm linkage locations. The sequence of the hardware components is as follows:
M2x10 Machine Screw
M2 Washer
Ball Link
Servo Arm or Control Horn
M2 Lock Nut
5. Repeat the process for the other control linkage.
Take this this moment to check and finalize the position of the servo arms and pushrod lengths on your ailerons, flaps and nose gear steering. Also
ensure that the motors are spinning in the correct direction, left motor is CCW and right motor is CW when viewed from the tail of the airplane (as
shown below) swap any 2 motor → ESC wires to reverse motor rotation.
Make any final control surface adjustments as necessary either mechanically or in the Aura configuration, do not use trim or sub-trim on the radio.
WARNING
Note: Do not use thread locker on the bolts holding the push rods to the servo arms or the control horns!
Using thread locker will weaken the plastic, void your warranty, and cause your airplane to crash!
Control Horns
Elevator Rudder
Servo Arms
Elevator Rudder
Page 20
19
ESC THROTTLE CALIBRATION
In order to map the full range of the ESCs output to your throttle stick motion you will have to preform an ESC throttle calibration. Both ESCs will
calibrate simultaneously so you only need to calibrate once. NOTE: Execute ESC throttle calibration with the propellers and spinners removed.
1. Power on your transmitter, DISABLE any throttle hold or throttle kill switches, completely lower the throttle trim and set the stick to full throttle.
2. Connect the flight pack to your Twin Otter 80E.
3. Listen for the tones coming from the ESCs through the motors, about 2 seconds after RF is engaged you should hear two tones.
4. Pull your throttle stick back to idle.
5. Listen for the ESC arming tones from the motor.
6. Unplug the flight battery to complete calibration.
The ESC throttle range has now been properly calibrated, and is stored in the ESC's memory until it is calibrated again. You can repeat this process as
many times as necessary.
CONNECTING BATTERY/ARMING ESC
Observe the following procedures to safely power up your model after
it has been bound. Ensure propellers are removed unless this
sequence is followed to power up before flight.
1. Turn on the transmitter. Lower the throttle stick AND throttle
trim to their lowest settings. Be sure to wait for your transmitter to
indicate it the radio signal is being broadcast before proceeding.
If a battery is connected to the ESCs with the throttle fully open
on the transmitter, the ESCs will enter programming mode. If
this occurs, simply disconnect the battery, lower the throttle
and reconnect the battery.
2. Ensure the aileron, elevator and rudder gimbals are centered.
3. With the airplane on a solid surface, connect the battery to the
ESCs and wait. The ESCs will make the motors emit a series of
audible tones during their initialization process.
4. The ESCs will make the motors emit a short, final tone sequence
indicating that the ESCs are now armed and that the motors will
spin in response to throttle stick movement.
WARNING
When making adjustments to linkages, transmitter settings,
or the Aura 8 flight control system, remove the propellers to
guard against accidental spool up.
WARNING
Hold aircraft securely when connecting the battery before flight.
Always ensure that the propellers are clear of any and all objects as
they may become entangled.
CAUTION
Always connect the battery when the throttle stick and throttle trim
are in the idle/cut-off position.
CAUTION
Note: After throttle calibration is complete it is necessary to reset the failsafe on your receiver
(see your radio documentation, this may require a re-bind).
Page 21
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CONTROL DIRECTION TEST
Refer to the chart below to determine the proper control surface directions, test these in Flight Mode 3. To test differential thrust, PROPELLERS MUST
BE REMOVED and channel 7 must be active (typically throttle hold off ).
If controls are reversed, DO NOT REVERSE CONTROLS IN YOUR TRANSMITTER OR IN THE AURA CONFIG TOOL. Email us at
support@flexinnovations.com for corrective action. Note that BOTH the Transmitter Control Direction Test AND the Flight Controller Sensor
Direction Test MUST BE PASSED! IF EITHER ONE DOES NOT PASS, DO NOT FLY!
NOTE: There is pre-configured rudder to aileron and rudder to elevator mixing programmed into the Aura. Simultaneous
movement of these control surfaces with rudder input is intentional and completely NORMAL.
Additionally: Aura has a built-in flap system that moves the flaps at a slower speed. There is also flap to elevator mixing
configured in the Aura Flap System. This speed and mixing is intentional and completely NORMAL.
Transmitter
Command
Proper Control
Surface Deflection
Stick Left
Stick Right
Stick Forward
Stick Aft
Stick Left
Stick Right
RUDDER
ELEVATOR
AILERON
Page 22
21
AURA SENSOR DIRECTION TEST
Perform a test of the gyro system to verify the corrections made for a given movement are correct. If any of the tests do not result in the correct
reaction from the airplane's gyro system, DO NOT FLY THE AIRPLANE, and contact us via email at support@flexinnovations.com
The flight control system activates with RF broadcast. Perform these tests in Flight Mode 3 (higher gain) for better visibility and then in Flight Mode 2.
Gyro is disabled in Flight Mode 1 so there will be no motion when performing this test. Control surface deflections are exaggerated in the pictures
below for clarity. Please note that the control surfaces will move ONLY while the aircraft is being ROTATED. To test differential thrust, PROPELLERS
MUST BE REMOVED and channel 7 must be active (typically throttle hold off ).
Aircraft
Movement
Proper Control
Surface Deflection
RUDDER
ELEVATOR
AILERON
Page 23
22
NOSE CONE, COWLING, PROPELLER AND SPINNER INSTALLATION
Required Tools and Fasteners: (3) M2x7 Phillips Self Tapping Screw M8 Nut & Washer for Propeller Adapter
(4) M2x13 Phillips Self Tapping Screw #1 Phillips Screwdriver
(2) M3x10 Phillips Button Head Screw
1. Install the nose cone using three M2X7mm self tapping screws, if you have the night version connect the LED lead first.
2. Install the cowlings to the motor nacelles using two M2X13mm self tapping screws. Glue the exhaust to each side of the nacelles using CA or Epoxy.
3. Install the propellers to the motors using the provided washer and nut, note that they are labeled L and R, defined as viewed from the rear of the
airplane.
4. Install the spinners to the prop adapters using the provided M3X10mm screw (don’t use thread locker). There is a left and a right spinner, use the
shape of the prop to determine which side each spinner should be installed on.
(QTY 3) (QTY 4) (QTY 2)
Page 24
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CENTER OF GRAVITY VERIFICATION
The Twin Otter 80E does not fly like your typical acrobatic or 3D model, for
that reason it is important that you do not stray from the recommended CG.
Flex has done extensive flight testing to arrive with this range. In particular,
DO NOT fly the airplane more tail heavy than recommended, it will not
perform as expected.
The CG is located between 3-5/16 and 3-3/4 inches (85mm and 95mm)
from the leading edge of the wing.
These CGs were measured by lifting the completed airplane upright, with all
components installed. This location was determined from many test flights
by designer and multi-time world aerobatic champion, Quique Somenzini.
Lift the airplane from the underside of the wing to check CG.
Note that the wing tube is at exactly 95mm so this can be used to find the
rearmost CG quickly if desired. This can be done by removing the hatch and
lifting the airplane from the wing tube to check for CG.
Setting the center of gravity is one of the most important steps for success,
particularly with a new airplane. The Twin Otter 80E is a high-performance
airplane with large control surface throws, and a high thrust-toweight ratio. These two factors combined make it a very enjoyable
aircraft to fly, but if the CG is not within an acceptable range, it will
make the aircraft difficult, if not impossible, to control.
NOTICE
The CG measurement should be made with the completed airframe with all
components (batteries, servos, receiver, linkages, screws, bolts, hardware, etc.)
installed. Failure to do so will result in inaccurate measurement.
BATTERY INSTALLATION
1. Push the spring-loaded battery latch tab back to release the battery hatch. Lift the hatch away from the fuselage, starting at the front.
2. Remove the battery tray by loosening the thumb screw. Slide the tray rearward as you gently lift the tray away from the fuselage.
3. Install an adhesive-backed hook strip to the battery tray, and an adhesive-backed loop strip to the battery.
4. Place the battery on the tray, and secure it in place with the hook and loop straps provided.
5. Re-install the tray into the battery compartment by aligning the front tab on the tray with the appropriate slot in the fuselage sub-frame. Once
seated in place, secure the tray to the sub-frame using the thumb screw.
6. Reinstall the hatch, and confirm that the latch has positively engaged.
WARNING
When making adjustments to linkages,
transmitter settings, or the Aura 8 flight
control system, remove the propellers to
guard against accidental spool up.
CAUTION
Always keep limbs clear from the propellers when the battery is connected. After the ESC
arms, the propellers will rotate when the throttle is moved. Unlike an internal combustion
engine, electric motors apply more voltage to counteract resistance, therefore any object
that is entangled in the propellers will be severely damaged before the motors will stop
Recommended CG
3-5/16 in. - 3-3/4 in.
(85mm - 95mm)
Page 25
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PRE-FLIGHT CHECKLIST
To help ensure a successful first flight, as well as many flights after, perform a few simple pre-flight checks to be sure the aircraft is ready
to fly:
1. Verify the ailerons, flaps, elevators and rudder are properly hinged and in good working order. Pinch a control
surface between your thumb and forefinger and grasp the stabilizers with your other hand. Attempt to move the
control surface back and forth perpendicular to the stabilizer (see Figure 1). Watch the hinges for movement. If you
find any loose hinges, apply Foam-Cure or 15/30 minute Epoxy, being sure to stay away from the hinge pivot, to the
loose side(s) of the hinge(s) and re-insert into its location. DO NOT apply thin CA to pin hinges! Ensure that the
hinge moves freely.
2. Verify all control surfaces move freely when disconnected from the servo. If you have a tight or binding surfaces that
use pin hinges, apply a small drop of light oil to each hinge pivot. Move the surface back and forth to work the oil
into the hinge. Repeat as needed.
3. Verify that all hardware and other aircraft parts are properly secured, including those connections that require blue
thread lock. This includes hardware and parts installed by the factory.
4. Verify your battery is fully charged and in good condition. Avoid using batteries with swollen cells, or batteries that
do not charge back to their full capacity.
5. Verify that the CG is in the proper location and that the battery is secured in place.
6. Ensure the Aura is on and functioning properly. Power on your transmitter, followed by the aircraft. Ensure the Aura
is calibrated properly and receiving a valid radio source (solid orange+solid green LEDs).
7. Verify transmitter stick inputs result in the proper control surface movements (reference page 20) and the Aura flight
modes work properly.
8. Verify aircraft movement results in proper Aura sensor corrections (reference page 21).
9. Verify the motor and ESC function properly. Point the aircraft in a safe direction. Hold the airframe firmly, smoothly
advance the throttle to full and back to idle. Listen and watch for any odd or unusual behavior for the motor or
speed controller.
AMA SAFETY CODE
When flying your aircraft, we recommend following the guidelines set by the Academy of Model Aeronautics (AMA). You can
find their safety handbooks as well as more information on the AMA at their website, located at the address below:
www.modelaircraft.org
Figure 1 - Test for hinge movement and loose hinges
DIFFERENTIAL THRUST WARNING!
The Twin Otter 80E implements differential thrust when in Flight Mode 3, this means that one of the motors can spool up whenever rudder input is
provided or the airplane is rotated. For this reason please follow these recommendations:
•
Never activate Flight Mode 3 until you are ready to take-off, the airplane may accelerate unexpectedly. Taxi to and from the runway in Flight Mode 2.
•
If the battery is plugged in, always handle and carry the airplane from the rear and with all body parts clear of the propellers.
•
We recommend that you assign the differential thrust disable switch to your throttle hold and only engage throttle when you have cleared
the airplane and are ready to taxi and take off.
Page 26
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TWIN OTTER 80E AURA OPTIONAL FEATURES CONFIGURATION
The Aura installed in your Twin Otter 80E comes with the Quick Set feature. Quick Set allows the pilot to adjust options in the Aura without the use of a
computer. The options of the Twin Otter 80E are described below:
•
Crow Mode switch: A switch can be used to activate Crow Mode (sometimes called Butterfly) during any Flight Mode. Crow Mode
simultaneously deflects the ailerons up and the flaps down to act as air brakes. The crow configuration is inversely proportional to throttle so that
full crow deflection at 0% throttle reducing to zero crow deflection at 50% throttle .
To use this feature, you will need a minimum 8 channel transmitter. If you wish to have a switchable Night LED setup, with crow, you will need a
minimum 9 channel transmitter with the 9th channel enabled on your receiver .
Twin Otter 80E Optional Feature Transmitter Setup
CH 8 (Aux 3) | Crow Switch (Optional) → Assign to 2-position switch
Flight Modes are as described in the table on page 14
•
Quick Set Procedure
Step 1 - Enter Quick Set Mode
1. Make sure all power is off on the Twin Otter 80E
2. Remove the prop before making changes
3. Turn on your transmitter
4. Remove the Servo lead from Aura Port S2.
5. Install a bind plug in Aura Port S2.
6. Plug in the motor battery to power up the Twin Otter 80E
7. After entering the Quick Set mode, the Orange LED will be off and the Green LED will be on SOLID. Initially the Blue and Red LEDs will also be
off.
Step 2 - Choose Profile
After entering Quick Set mode as described above, you toggle the Crow Mode switch (CH8) on the transmitter to enable or disable the different
options.
8. If you want to activate the Crow Mode switch, toggle the CH8 switch on your transmitter .
• If the RED LED is ON, the Crow Mode switch is ENABLED .
• If the RED LED is OFF, the Crow Mode switch is DISABLED .
Step 3 - Saving your Selections
9. After setting the Crow Mode option as desired, remove the bind plug to save your settings. The Blue, Green, and Red LEDs will briefly turn on
while the Aura is saving, the return to their previous state .
10. Completely power off the Twin Otter 80E and Aura
11. Replace the Servo Lead in Aura Port S2
12. Power up and Fly as usual with your new Aura Profile!
Note: This process can be repeated as many times as desired to enable or disable Crow Mode.
Page 27
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FLYING YOUR TWIN OTTER 80E
Selecting a Flying Site
Selecting a flying site is critical to a successful flight. Airplanes require a lot
more room than other R/C products, therefore, a neighborhood or
parking lot is less than ideal. A large open field with short grass and
generous overfly area are the best candidates if no AMA field is available
in your area. Know your overfly area - ensure that there are no houses,
playgrounds, or other buildings that may be damaged if the airplane were
to crash.
Takeoff
Taxi or place the aircraft on the runway centerline, with the nose pointed
into the wind. Select Flight Mode 2, then set throttle trim so that the
motor spins at its lowest RPM without stopping. For the first flight, leave
the flaps in the up position. Smoothly advance the throttle to full while
maintaining directional control with the rudder and slight back pressure
on the elevator. The airplane should lift off smoothly before the throttle is
fully open. Fly in Flight Mode 2 until the aircraft is fully trimmed (see
special trimming instructions), and you are comfortable with its handling,
then explore the other modes as desired.
Flying
Altitude is your friend on the first flight. Briskly climb to a safe altitude and
trim the airplane out. The airplane should fly straight and level at 2/3 to
3/4 power with no hands on the transmitter. Try some basic maneuvers,
and slowly progress into the airplane’s flight envelope as you become
more comfortable with the airplane’s flight qualities and perfect your
setup. Note: If at any time you experience unexpected control system
inputs or oscillations, switch to Flight Mode 1 and reduce speed
immediately, land and troubleshoot the issue.
Landing
Be mindful of your flight time and allow adequate battery reserve for a
couple of go-arounds, if necessary, on the first few flights. Select Flight
Mode 2 and slow the airplane and align with the runway, into the wind.
For your first landing, leave the flaps in the up position. The airplane
should descend smoothly in this configuration with proper airspeed. Once
you are close to the ground, gradually close the throttle fully and begin to
smoothly apply up elevator as required to arrest descent and the airplane
should gently touch down with a short roll out.
Trimming
Transmitter trim or sub-trim will cause trim shifts when
different flight modes are selected. To eliminate this trim shift,
the model should be mechanically trimmed, or Aura Quick
Trim may be used instead.
Aura Quick Trim
The Aura 8 features a Quick Trim Mode that eliminates the need for
mechanical linkage adjustments during test flights. Aura will learn
the trim values from your transmitter, and apply them to the control
surfaces at power up when enabling quick trim mode.
NOTE: Quick Trim can also be used BEFORE flying to make small
changes to center the control surfaces before flight.
1. Fly the airplane in Flight Mode 2 at 2/3 power. Trim the aircraft
with the transmitter trimmers and land. DO NOT CHANGE
FLIGHT MODES.
2. Power off the Twin Otter 80E. Insert a bind plug into Aura Port
S3 (you will need to remove the servo lead that is currently in
S3). Check the transmitter is on and re-power the Aura to enter
Quick Trim.
3. Wait 5 seconds for the Aura to completely initialize. Confirm
Quick Trim mode is active by checking the Blue LED is slowly
flashing.
4. Remove the bind plug from Aura Port S3 to save your trim
settings. The Blue LED will flash quickly after control surface trim
values are stored. While the trim values are stored in Aura, they
are not applied to the control surface(s) until the Aura is repowered.
5. Remove power from the Twin Otter 80E and center all control
surface trims on the transmitter.
6. Re-install the servo that was previously removed into port S3.
7. Re-power the Twin Otter 80E. The control surfaces should be
unchanged even though the trim has been centered on the
transmitter.
8. Switch between other Flight Modes to ensure you do not see
any changes in trim.
NOTE: Quick Trim may be repeated as needed for fine tuning,
or if changes to the aircraft are made.
NOTE: Ensure Aileron/Elevator/Rudder sub-trims are at zero
in the transmitter BEFORE flying for the Quick Trim
process to work properly.
DIFFERENTIAL THRUST WARNING!
The Twin Otter 80E implements differential thrust when in Flight Mode 3, this means that one of the motors can spool up whenever rudder input is
provided or the airplane is rotated. For this reason please follow these recommendations:
•
Never activate Flight Mode 3 until you are ready to take-off, the airplane may accelerate unexpectedly. Taxi to and from the runway in Flight Mode 2.
•
If the battery is plugged in, always handle and carry the airplane from the rear and with all body parts clear of the propellers.
•
We recommend that you assign the differential thrust disable switch to your throttle hold and only engage throttle when you have cleared
the airplane and are ready to taxi and take off.
Page 28
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REPLACING SERVOS
Required Tools and Fasteners: #1 Phillips Screwdriver
1. Disconnect the servo from the Aura 8.
2. Unscrew the servo arm from the servo and remove the servo arm.
3. Unscrew the two servo mounting screws at each end of the servo and remove. Note that some servos may be connected to a servo extension. This
extension should be left in the wing or fuselage when the servo is replaced.
AIRFRAME REPAIRS
The Twin Otter 80E is molded from durable EPO foam and is repairable with most adhesives. Similar to building and repairing wood or composite
airplanes, the correct glue for a given application is critical to the repair holding and not breaking again. For major repairs, such as a broken fuselage,
epoxy is preferred because it allows time to correct any misalignment. For smaller repairs, such as a cracked control surface or small chunk of material
missing from the airframe, regular CA is very effective. The use of odorless (foam safe) CA is not required and not recommended on EPO foam aircraft
because it takes a longer period of time to cure than regular CA and the bond tends to be weaker.
If a part is damaged too badly to be repaired, please refer to the table on page 3 for a complete listing of spare airframe parts.
NOTE: Avoid the use of CA accelerant in repairs. It can damage paint and will weaken the bond of the glue. If CA accelerant is used, be
mindful of the locations of CA to prevent premature bonding of parts, or bonding a hand or clamp to the airframe.
NOTE: Avoid keeping the airplane in direct sunlight when not flying. Excessive heat can damage the airplane’s structure and UV damage
can permanently discolor decals.
NOTICE
If a crash is imminent, fully reduce the throttle to prevent further damage to the power system and reduce energy to lessen impact
damage. Never allow the propeller to contact the ground under power, even idle.
CRASH DAMAGE IS NOT COVERED UNDER ANY PRODUCT WARRANTY.
WARNING
Note: Do not use thread locker on any metal to plastic connection including the bolts holding the push rods to the
servos or the control horns (they use lock nuts and will not back out)!
Using thread locker will weaken the plastic, void your warranty, and cause your airplane to crash!
Page 29
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AIRCRAFT TROUBLESHOOTING GUIDE
Should you encounter any abnormal situations with your Twin Otter 80E, refer to the table below to determine the probable cause and a recommended
solution for the issue. If the required solution does not rectify the problem, please contact product support at support@flexinnovations.com for further
NOTICE
Unless specifically required, ALWAYS troubleshoot the airplane with the propeller removed.
DISCREPANCY
PROBABLE CAUSE
RECOMMENDED SOLUTION
Motor non-responsive (no ESC
initialization tones audible)
Throttle not at idle and/or throttle trim too high
Lower throttle stick and trim completely. If problem persists, ensure that the sub-trim and travel
adjust are properly set in the radio’s programming
Motor disconnected from ESC
Ensure plugs are fully seated. Check battery and/or plugs for damage and replace any damaged
components found - DO NOT ATTEMPT REPAIR
Motor non-responsive (throttle
calibration tones received)
Throttle channel is reversed
Reverse throttle channel in radio programming
Motor turns in the wrong direction
The three motor wires are connected incorrectly to the ESC
Swap any TWO motor wires
Reduced flight time or aircraft
underpowered
Battery not fully charged
Ensure battery is fully charged prior to installing in aircraft
Propeller installed backwards
Install propeller so that the convex side faces forward (tractor configuration)
Battery is too weak or damaged
Remove battery from service completely and replace with a different battery
Ambient temperature is too cold
Ensure battery packs are adequately warm (70°F/21°C) before flight
Battery capacity too small for intended use
Replace battery with one of proper capacity and discharge capacity
ESC reaching preset LVC (low-voltage cutoff)
Recharge flight battery or reduce flight time
Battery’s discharge rating may be too small
Replace battery with one with higher ‘C’ rating
Excessive propeller noise and/or
vibration
Damaged spinner and/or propeller, collet, or motor
Replace damaged components - DO NOT ATTEMPT REPAIR
Propeller is not balanced
Balance or replace the propeller
Prop nut is loose
Tighten prop nut with appropriate-sized wrench
Spinner is not fully in place or tightened
Loosen the spinner bolt, adjust as required, retighten spinner bolt
Propeller nut or propeller adapter threads not cut straight
Replace propeller nut or propeller shaft - DO NOT ATTEMPT REPAIR
Control surfaces nonresponsive
Airframe or control linkage system damage
Examine airframe for damage, repair as required; inspect control linkage system (servo, pushrod,
control horn) for damaged components and replace as required
Wire damaged or connector loose
Examine wires and connections, replace as necessary
Transmitter bound incorrectly, incorrect active model
memory, incorrect Aura data input configuration, incorrect
Aura transmitter settings
Consult radio manual for proper binding and model selection instructions
Battery voltage too low
Use volt meter to check battery; recharge or replace as necessary
Battery disconnected from ESC
Check that the EC5 plugs are fully seated
BEC (battery elimination circuit) damaged
Replace ESC - DO NOT ATTEMPT REPAIR
Damaged Servo
Replace Servo - DO NOT ATTEMPT REPAIR
Failed control direction test
Incorrect Aura 8 or Transmitter Setting - DO NOT FLY!
Reference transmitter and receiver sections of this manual. Refer to control surface direction
chart and transmitter setup; adjust appropriate settings as required. Check Twin Otter 80E and
Aura wiki web pages for additional information. If no solution is found, contact customer support
at support@flexinnovations.com
Failed Sensor Direction Test
Aura 8 is not mounted in the proper orientation
Mount Aura in the proper orientation
Aura 8 settings incorrect
Reference the transmitter and receiver sections of this manual. If no is solution is found, contact
customer support at support@flexinnovations.com
Control surface oscillation
Exceeding maximum airspeed for configuration
Reduce airspeed
Gains too high for aircraft/flight configuration
Refer to Aura 8 manual to decrease desired control surface gain
Propeller/spinner not balanced
Balance or replace propeller and/or spinner
Motor vibration
Inspect motor mounting bolts and re-tighten as necessary
Loose Aura 8 mounting
Re-align and secure the Aura 8 to the aircraft
Control linkage slop
Examine control system and repair or replace worn components
Improper transmitter setup
Refer to Aura 8 manual to correctly configure transmitter
Damaged propeller or spinner
Replace damaged component- DO NOT ATTEMPT REPAIR
Improperly set master gain
Ensure master gain is set for proper gain value
Trim changes between flight
modes
Trims are not properly zeroed
Readjust control linkage and re-center trims in radio
Sub-trim is not properly zeroed
Remove sub-trim; adjust the servo arm or clevis to achieve proper geometry
Transmitter is not properly calibrated (aileron/elevator/
rudder are not neutral with sticks centered; reference
transmitter monitor
Calibrate transmitter (reference manufacturer’s instructions, or return to manufacturer for
calibration
Gyro doesn't respond to aircraft
movements
Incorrect Flight Mode selected
Gyro is only enabled in Flight Modes 2 and 3, check that you are not testing the gyro in Flight
Mode 3
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LIMITED WARRANTY
Warranty Coverage
Flex Innovations LLC and its authorized resellers (“Flex”) warrant to the
original purchaser that this product (the “Product”) will be free from
defects in materials and workmanship at the date of purchase.
Outside of Coverage
The warranty is not transferable and does not cover:
(a) Products with more than 45 days after the purchase date
(b) Damage due to acts of God, accident, misuse, abuse,
negligence, commercial use, or due to improper use,
installation, operation, or maintenance
(c) Damage to other components or assemblies associated with
the use of the Product.
(d) Modification of or to any part of the Product
(e) Product not purchased from an authorized Flex Innovations
dealer or distributor.
(f) Product that has been partially, or fully assembled
(g) Shipping damage
(h) Cosmetic damage
(i) Services or labor associated with the repair, use or assembly of
the Product.
OTHER THAN THE EXPRESS WARRANTY ABOVE, FLEX MAKES NO
OTHER WARRANTY REPRESENTATION, AND HEREBY DISCLAIMS ALL
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. THE PURCHASER
ACKNOWLEDGES THAT THEY ALONE HAVE DETERMINED THAT THE
PRODUCT WILL SUITABLY MEET THE REQUIREMENTS OF THE
PURCHASER’S INTENDED USE.
Purchaser’s Remedy
Flex’s sole obligation and purchaser’s sole and exclusive remedy shall be
that Flex will, at its option, either (i) service, (ii) replace any part of the
Product determined by Flex to be defective, or (iii) replace the Product
determined by Flex to be defective. Flex reserves the right to inspect all
Product(s) involved in a warranty claim. Service or replacement decisions
are at the sole discretion of Flex. Proof of purchase is required for all
warranty claims. SERVICE OR REPLACEMENT AS PROVIDED UNDER
THIS WARRANTY IS THE PURCHASER’S SOLE AND EXCLUSIVE
REMEDY.
Limitation of Liability
FLEX SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES, LOSS OF WAY, REGARDLESS OF WHETHER
SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, TORT, NEGLIGENCE,
STRICT LIABILITY OR ANY OTHER THEORY OF LIABILITY, EVEN IF FLEX
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Further, in no event shall the liability of Flex exceed the individual price
of the Product on which liability is asserted. As Flex has no control over
use, setup, assembly, modification or misuse, no liability shall be
assumed nor accepted for any resulting damage and/or injury. By the act
of use, setup or assembly, the user accepts all resulting liability. If you as
the purchaser or user are not prepared to accept the liability associated
with the use of the Product, purchaser is advised to return the Product
immediately in new and unused condition to the place of purchase.
Law
These terms are governed by Florida law (without regard to conflict of
law of principals). This warranty gives you specific legal rights, and you
may also have other rights which vary from state to state. FLEX RESERVES
THE RIGHT TO MODIFY THIS WARRANTY AT ANY TIME WITHOUT NOTICE.
Questions & Assistance
Contact Us By:
E-Mail – support@flexinnovations.com
Phone – 1 (866) 310-3539
Inspection or Services
If this Product needs to be inspected or serviced and is compliant in the
region you live and use the Product in, please contact your regional Flex
authorized reseller. Pack the Product securely using the original shipping
carton. Please note that both the inner and outer boxes need to be
included. The inner box is not designed to withstand the rigors of
shipping without additional protection from the outer shipping carton.
Ship via a carrier that provides tracking and insurance for lost or
damaged parcels, as Flex is not responsible for merchandise until it
arrives and is accepted at our facility.
Warranty Requirements
For Warranty consideration, you must include your original sales receipt
verifying the proof of purchase date. Provided any warranty conditions
have been met, your Product or its defective parts will be replaced or
serviced free of charge. Responsibility of shipping charges are as follows:
To Flex from customer, Customer is responsible.
To Customer from Flex, Flex is responsible.
Service or replacement decisions are at the sole discretion of Flex.
COMPLIANCE INFORMATION FOR THE
EUROPEAN UNION
Declaration of Conformity (In accordance with ISO/IEC 17050-1)
Product(s): Twin Otter 80E Super PNP
Item Number(s): FPM5070A
FPM5080A
The object of declaration described above is in conformity with the
requirements of the specifications listed below, following the provisions of
the EMC Directive 2004/108/EC.
EN 55022: 2010+AC: 2011
EN 55024: 2010
EN 61000-3-2: 2006+A2:2009
EN 61000-3-3: 2013
EN 61000-6-3: 2007/A1:2011
EN 61000-6-1: 2007
Instructions for disposal of WEEE by users in the
European Union
This product must not be disposed of with other waste.
Instead, it is the user’s responsibility to dispose of their waste
equipment by handing it over to a designated collections
point for the recycling of waste and electronic equipment. The
separate collection and recycling of your waste equipment at
the time of disposal will help to conserve natural resources
and ensure that it is recycled in a manner that protects human
health and the environment. For more information about
where to drop off your waste equipment for recycling, please
contact your local city office, your household waste disposal
service or where you purchased the product.
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Building and Flying Notes
Page 32
www.flexinnovations.com
© 2023 Flex Innovations, LLC. All rights reserved.
Potenza™ is a trademarks of Flex Innovations LLC
DSM®, DSM2™, and DSMX™ are trademarks of Horizon Hobby, Inc.
Futaba is a registered trademark of Futaba Denshi Kogyo Kabushiki Kaisha Corporation of Japan.
Jeti, UDI, and Jeti Model are trademarks or registered trademarks of Jelen, Ing. Stanislav of Czech Republic
HoTT is a registered trademark of SJ, Inc.
Rev. A
Created 09/2023
Enjoy your Flex Innovations Twin Otter 80E!
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