E-flite UMX™ J-3 Cub Instruction Manual

1-2-3-4-5 Sec.

UMX™ J-3 Cub

Instruction Manual

Bind your Transmitter to the Aircaft

For a list of compatible DSM2/DSMX transmitters, please visit www.bindnﬂ y.com

Binding Procedure

CAUTION: When using a Futaba transmitter with a Spektrum DSM®

module, you must reverse the throttle channel and rebind. Refer to your Spektrum module manual for binding and failsafe instructions. Refer to your Futaba transmitter manual for instructions on reversing the throttle channel.

1. Refer to your transmitter’s unique instructions for binding to a receiver (location of transmitter’s Bind control).

2. Make sure the ﬂ ight battery is disconnected from the aircraft.

3. Ensure the transmitter is powered OFF.

4. Connect a fully charged ﬂ ight battery to the aircraft and turn the aircraft upright. The receiver LED will begin to ﬂ ash (typically after 5 seconds).

5. Ensure that control surface trims are centered and the throttle sticks

and trim are in the lowest position to correctly set the failsafe.

6. Put your transmitter into bind mode. Refer to your transmitter’s manual for binding button or switch instructions.

7. After 5 to 10 seconds, the receiver status LED will turn solid,

indicating that the receiver is bound to the transmitter. If the LED does not turn solid, refer to the Troubleshooting Guide at the back of the manual.

For subsequent ﬂ ights, power ON the transmitter for 5 seconds before connecting the ﬂ ight battery.

Centering the Control Surfaces

Before your ﬁ rst ﬂ ight make sure the aircraft’s control surfaces are centered.

1. Power on the transmitter and then the aircraft.

2. Set all transmitter trims and sub-trims to zero. 3 Check the control surfaces to make sure they are centered.

4. If centering is required, use a pair of pliers to carefully bend the metal linkage (see illustration).

In ﬂ ight trimming may be required

During your ﬁ rst ﬂ ight, the aircraft should ﬂ y straight and level. Use your transmitter trims to ﬁ ne tune the aircraft’s ﬂ ight path until its ﬂ ight path has been corrected. Any transmitter trim that requires 4 or more clicks of trim (per channel), should be mechanically centered. Note the control surface’s postion and return the transmitter trim to zero.

Adjust the linkages mechanically so that the control surfaces are in the ﬂ ight trimmed position.

Transmitter set up

A DSM2/DSMX transmitter is required for this aircraft.

Set wing type and servo reversing to normal.

NOTICE: Do not set your transmitter travel adjust over 100%, doing so may

overdrive the servo and cause damage.

For the ﬁ rst ﬂ ight, ﬂ y the model in low rate.

For landing, we recommend using high rate elevator.

Make the U-shape narrower to make the connector shorter. Make the U-shape wider to make the linkage longer.

Aileron 100% 70%

Elevator 100% 70%

Rudder 100% 70%

Dual Rates

High Low

motor will turn the propeller in response to any throttle movement.

Arming the ESC/receiver also occurs after binding as previously described, but subsequent connection of a ﬂ ight battery requires the following steps.

AS3X

The AS3X® system will not activate until the throttle stick or trim is increased for the first time. Once active, the control surfaces may move rapidly and noisily on the aircraft. This is normal. AS3X technology will remain active until the battery is disconnected.

1. Open the battery hatch from the fuselage.

2. Install the flight battery in the center of battery tray. Ensure the battery is secured by the hook and loop strip.

Center of Gravity (CG)

At the wing root, measure back 36mm from the leading edge where the wing meets the fuselage. The easiest way to achieve CG is to balance the aircraft inverted.

3. Lower the throttle and throttle trim to the lowest settings on your transmitter. Power on your transmitter, then wait 5 seconds.

4. Connect the battery to the ESC, noting proper polarity. Keep the plane immobile and away from wind for 5 seconds to allow the AS3X system to initialize. A series of tones and a continuous LED indicates a successful connection.

ﬂ ying to eliminate power supplied to the motor. The ESC does not have an arming switch and will respond to any transmitter input when a signal is present.

ﬂ ying to avoid over-discharging the battery. Batteries discharged to a voltage lower than the lowest approved voltage may become damaged, resulting in loss of performance and potential ﬁ re when batteries are charged.

ESC/Receiver Arming

CAUTION: Always keep hands away from the propeller. When armed, the

36mm

CAUTION: Always disconnect the Li-Po battery from the ESC when not

Low Voltage Cutoff (LVC)

LVC is a feature built into your ESC to protect the battery from over-discharge. When the battery charge becomes too low, LVC limits power supplied to the motor. When you hear the motor power pulse, land the aircraft immediately and recharge the ﬂ ight battery.

NOTICE: Do not rely on LVC to determine when to land your aircraft. Set a flight timer to the recommended flight time. Repeated flying to LVC will damage the battery.

Control Direction Tests

There are 2 types of control direction tests to perform on your aircraft. One is to conﬁ rm that your transmitter inputs are correctly performed by your aircraft. The second test is to conﬁ rm that AS3X

technology is operating correctly in your aircraft. Use the chart below to assist you with performing these test.

Test 1 Control Direction Test Test 2 AS3X Direction Test

Transmitter Input Aircraft Reaction Move Aircraft

Move the control sticks on the transmitter to make sure the aircraft control surfaces move correctly and in the proper direction. Make sure the tail linkages move freely and that paint or decals are not adhered to them.

Elevator

Aileron

1. Advance the throttle to 25% to activate the AS3X system.

2. Fully lower the throttle.

3. Move the entire

Elevator

aircraft as shown and ensure the control surfaces move in the direction indicated in the graphic. If the control surfaces do not respond as shown, do not fly the aircraft. Refer to the receiver manual for more

information.

Aileron

Once the AS3X system is active, control surfaces may move rapidly. This is normal. AS3X is active until the battery is disconnected.

Preﬂ ight Checklist

1. Charge ﬂ ight battery.

2. Install ﬂ ight battery in aircraft (once it has been fully charged).

3. Bind aircraft to transmitter.

4. Make sure linkages move freely.

5. Perform Control Direction Tests

Flying Tips

We recommend ﬂ ying your aircraft outside in calm conditions. Always avoid ﬂ ying near houses, trees, wires and buildings. You should also be careful to avoid ﬂ ying in areas where there are many people, such as busy parks, schoolyards or soccer ﬁ elds. Consult local laws and ordinances before choosing a location to ﬂ y your aircraft.

Takeoff

Place the aircraft in position for takeoff (facing into the wind if ﬂ ying outdoors). Set dual rates to low position and gradually increase the throttle to ¾ to full and steer with the rudder. Pull back gently on the elevator and climb to check trim. Once the trim is adjusted, begin exploring the ﬂ ight envelope of the aircraft.

Landing

Land into the wind. Fly the aircraft to approximately 6 inches (15cm) or less above the runway, using a small amount of throttle for the entire descent. Keep the throttle on until the aircraft is ready to ﬂ are.

During ﬂ are, keep the wings level and the airplane pointed into the wind. Gently lower the throttle while pulling back on the elevator to bring the aircraft down on all three wheels.

Failure to lower the throttle stick and trim to the lowest possible positions during a crash could result in damage to the ESC in the receiver unit, which may require replacement.

Over Current Protection (OCP)

This aircraft is equipped with Over Current Protection (OCP). This feature protects the ESC from damage. OCP stops the motor when the transmitter throttle is set too high and the propeller cannot turn. The OCP will only activate when the throttle stick is positioned just above 1/2 throttle. After the ESC stops the motor, fully lower the throttle to re-arm the ESC.

6. Set dual rates and expos.

7. Adjust center of gravity.

8. Perform a radio system Range Check.

9. Find a safe and open area.

10. Plan ﬂ ight for ﬂ ying ﬁ eld conditions.

CAUTION:

Always decrease throttle at propeller strike.

Rudder

Optional Float installation (EFLUA1190)

Follow the instructions included with your optional ﬂ oat set for assembly. Replace the rear strut on the ﬂ oat assembly with the rear strut included with the J-3 Cub. Once the rear strut has been switched, install the fully assembled ﬂ oat set as shown.

Replace the rear strut included in the ﬂ oat

WIDER

set kit with the rear strut included with the aircraft.

Rudder

NOTICE: Crash damage is not covered under the warranty.

Repairs

Repair the aircraft only with foam-compatible CA (cyanoacrylate adhesive) or clear tape. Use of other types of glue can damage the foam. For a listing of all replacement and optional parts, refer to the product page online at Horizonhobby.com.

NOTICE: Use of foam-compatible CA accelerant on your aircraft can damage paint. DO NOT handle the aircraft until the accelerant fully dries.

NOTICE: When you are ﬁ nished ﬂ ying, never leave the aircraft in direct sunlight or in a hot, enclosed area such as a car. Doing so can damage the foam.

Post Flight Checklist

1. Disconnect the flight battery from the ESC (required for safety and battery life).

2. Power OFF the transmitter.

3. Remove the flight battery from the aircraft.

4. Recharge the flight battery.

5. Store the flight battery apart from the aircraft and monitor the battery charge.

6. Make note of the flight conditions and flight plan results, planning for future flights.

Remove the main gear by removing 2 screws and front bracket.

Install the ﬂ oat assembly to the fuselage.

Secure the ﬂ oat assembly with the front and rear bracket and screws. (the rear bracket and 2 screws are included in the box).

NOTICE

All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, LLC. For up-todate product literature, visit www.horizonhobby.com and click on the support tab for this product.

Meaning of Special Language:

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 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 superﬁ cial injury.

WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to

operate the product correctly can result in damage to the product, personal property and cause serious injury.

This is a sophisticated hobby product. It must be operated with caution and common sense and 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. This product is not intended for use by children without direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. 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.

Age Recommendation: Not for children under 14 years. This is not a toy.

designed and protected for this purpose. Moisture causes damage to electronics.

• Never place any portion of the model in your mouth as it could

Safety Precautions and Warnings

• Always keep a safe distance in all directions around your model to avoid collisions or injury. This model is controlled by a radio signal subject to interference from many sources outside your control. Interference can cause momentary loss of control.

• Always operate your model in open spaces away from full-size vehicles, trafﬁ c and people.

• Always carefully follow the directions and warnings for this and any optional support equip-ment (chargers, rechargeable battery packs, etc.).

• Always keep all chemicals, small parts and anything electrical out of the reach of children.

• Always avoid water exposure to all equipment not speciﬁ cally

cause serious injury or even death.

• Never operate your model with low transmitter batteries.

• Always keep aircraft in sight and under control.

• Always use fully charged batteries.

• Always keep the transmitter powered on while aircraft is powered.

• Always remove batteries before disassembly.

• Always keep moving parts clean.

• Always keep parts dry.

• Always let parts cool after use before touching.

• Always remove batteries after use.

• Always ensure failsafe is properly set before ﬂ ying.

• Never operate aircraft with damaged wiring.

• Never touch moving parts.

UMX™ J-3 Cub

Speciﬁ cations Component List

26.4 in (670mm)

16.9 in (430mm)

Wing Area: 100.1 sq. in. (646 sq. cm.)

Replacement Parts

Part #

EFLU3401 Painted Fuselage: UMX J-3 BL

EFLU3402 Wing with struts: UMX J-3 B

EFLU3403 Complete Tail: UMX J-3 B

EFLU3404 Landing Gear Set: UMX J-3 B

EFLU3405 Plastic Parts Set: UMX J-3 B

EFLU3406 Pushrod Set: UMX J-3 B

EFLU3407 Decal Sheet: UMX J-3 B

SPMSA2030L 2.3-Gram Performance Linear Long Throw Servo

EFLUP575225 5.75x2.25 Electric Propeller: UMX Yak 54

EFLU4067 Prop Adapter: UMX Beast

EFLUM180BL2 180 Brushless Outrunner Motor 2500KV

EFLU4864 DSM2 6 Ch Ultra Micro AS3X Receiver BL ESC

Created 12/15 48975.1 (EN)

Description

E-ﬂ ite, AS3X, UMX, DSM, DSM2, DSMX, ModelMatch, Bind-N-Fly, Celectra and the Horizon Hobby logo are trademarks or registered trademarks of Horizon Hobby, LLC.

3.6oz, (102g)

The Spektrum trademark is used with permission of Bachmann Industries, Inc.

Futaba is a registered trademark of Futaba Denshi Kogyo Kabushiki Kaisha Corporation of Japan.

All other trademarks, service marks and logos are property of their respective owners.

Installed

Motor: BL180 Brushless Outrunner Motor, 2500Kv

Receiver : DSM2 6 Ch Ultra Micro AS3X

(2) 2.3-Gram Performance Linear Long Throw Servo

Required to Complete

Recommended Battery: 200mAh 2S 7.4V 30C Li-Po, 26AWG

Recommended Battery Charger:

Celectra™ 2S 7.4V DC Li-Po Charger

Recommended Transmitter: Spektrum™ DSM2®/DSMX® full range with dual-rates (DX4e and up)

Patents pending.

Receiver BL-ESC

Optional Parts and Accessories

Part #

PKZ1039 Hook and Loop Set (5): Ultra Micros

EFLUA1190 Float Set w/Accessories

SPMA3060 USB-Interface: UM AS3X Programmer

EFLUC1007 Celectra 2S 7.4V DC Li-Po Charger

EFLC1105 1S-2S AC/DC Li-Po Balancing Charger

EFLUC1008 Power Cord for EFLUC1007

EFLB2002S30 200mAh 2s 7.4V DC Li–Po, 26AWG

EFLB2802S30 280mAh 2s 7.4V DC Li–Po, 26AWG

EFLA700UM Charger Plug Adapter: EFL

EFLA7001UM Charger Plug Adapter: Thunder Power

EFLU4068 Harness Adapter: UMX Beast

SPM6825 Ultra Micro Linear Servo Reverser

EFLC4000/UK/ AU/EU

Description

AC to 12V DC,1.5 Amp Power Supply (Based upon your sales Region)

DX6 DSMX 6-Channel Transmitter

DX7 DSMX 7-Channel Transmitter

DX9 DSMX 9-Channel Transmitter

DX18 DSMX Transmitter

Instruction Manual

Trouble Shooting

Problem Possible Cause Solution

AS3X

Control surfaces not at neutral position when transmitter controls are at neutral

Model ﬂ ies inconsistently from ﬂ ight to ﬂ ight

Controls oscillate in ﬂ ight, (model rapidly jumps or moves)

Aircraft will not respond to throttle but responds to other controls

Extra propeller noise or extra vibration

Reduced ﬂ ight time or aircraft underpowered

LED on receiver ﬂ ashes and aircraft will not bind to transmitter (during binding)

LED on receiver ﬂ ashes rapidly and aircraft will not respond to transmitter (after binding)

Control surface does not move

Controls reversed Transmitter settings reversed Adjust controls on transmitter appropriately

Motor loses power Damage to motor or power components Do a check of motor and power components for damage (replace

Motor power quickly decreases and increases then motor loses power

Motor/ESC is not armed after landing

Servo locks or freezes at full travel

Control surfaces may not have been mechanically centered from factory

Aircraft was moved after the ﬂ ight battery was connected and before sensors initialized

Aircraft was not kept immobile for 5 seconds after battery was plugged in

Trims are moved too far from neutral position Neutralize trims and mechanically adjust linkages to center

Propeller is unbalanced, causing excessive vibration Remove propeller and rebalance or replace it if damaged

Prop screw is too loose, causing vibration Tighten the prop screw

Throttle stick and/or throttle trim too high Reset controls with throttle stick and throttle trim at lowest

Throttle channel is reversed Reverse throttle channel on transmitter

Motor disconnected from receiver Open fuselage and make sure motor is connected to the receiver

Damaged propeller, spinner or motor Replace damaged parts

Prop screw is too loose Tighten the prop screw

Prop is out of balance Remove and balance propeller, or replace with a balanced propel-

Flight battery charge is low Completely recharge ﬂ ight battery

Propeller installed backwards Install propeller with numbers facing forward

Flight battery damaged Replace ﬂ ight battery and follow ﬂ ight battery instructions

Flight conditions may be too cold Make sure battery is warm before use

Battery capacity too low for ﬂ ight conditions Replace battery or use a larger capacity battery

Transmitter too near aircraft during binding process Power off transmitter, move transmitter a larger distance from

Bind switch or button not held long enough during bind process

Aircraft or transmitter is too close to large metal object, wireless source or another transmitter

Less than a 5-second wait between ﬁ rst powering on transmitter and connecting ﬂ ight battery to aircraft

Aircraft bound to different model memory (ModelMatch radios only)

Flight battery/transmitter battery charge is too low Replace/recharge batteries

Transmitter may have been bound to a different model (or with a different DSM Protocol)

Aircraft or transmitter is too close to large metal object, wireless source or another transmitter

Control surface, control horn, linkage or servo damage Replace or repair damaged parts and adjust controls

Wire damaged or connections loose Do a check of wires and connections, connect or replace as

Flight battery charge is low Fully recharge ﬂ ight battery

Control linkage does not move freely Make sure control linkage moves freely

Battery power is down to the point of receiver/ESC Low Voltage Cutoff (LVC)

Over Current Protection (OCP) stops the motor when the transmitter throttle is set high and the propeller cannot turn

Travel adjust value is set above 100%, overdriving servo Set Travel adjust to 100% or less and/or set sub-trims to zero

™

Center control surfaces mechanically by adjusting the U-bends on control linkages

Disconnect and reconnect the ﬂ ight battery while keeping the aircraft still for 5 seconds

Keep the aircraft immobile for 5 seconds after plugging in the battery

control surfaces

setting

ler

aircraft, disconnect and reconnect ﬂ ight battery to aircraft and follow binding instructions

Power off transmitter and repeat bind process. Hold transmitter bind button or switch until receiver is bound

Move aircraft and transmitter to another location and attempt binding again

Leaving transmitter on, disconnect and reconnect ﬂ ight battery to aircraft

Select correct model memory on transmitter and disconnect and reconnect ﬂ ight battery to aircraft

Select the right transmitter or bind to the new one

Move aircraft and transmitter to another location and attempt linking again

needed

as needed)

Recharge ﬂ ight battery or replace battery that is no longer performing

Fully lower throttle and throttle trim to arm ESC

and adjust linkages mechanically