GREAT PLANES U-Can-Do 3D Ep Instruction Manual

WARRANTY

Great Planes

®

Model Manufacturing Co. guarantees this kit to be free from defects in both material and workmanship at the date of
purchase.This warranty does not cover any component parts damaged by use or modification. In no case shall Great Planes’ liability
exceed the original cost of the purchased kit. Further, Great Planes reserves the right to change or modify this warranty without notice.

In that Great Planes has no control over the final assembly or material used for final assembly, no liability shall be assumed nor
accepted for any damage resulting from the use by the user of the final user-assemb led product.By the act of using the user-assembled
product, the user accepts all resulting liability.

If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is advised to return this
kit immediately in new and unused condition to the place of purchase.

To make a warranty claim send the defective part or item to Hobby Services at the address below:

Hobby Services

3002 N. Apollo Dr. Suite 1

Champaign IL 61822 USA

Include a letter stating your name, return shipping address, as much contact information as possible (daytime telephone number, fax
number, e-mail address), a detailed description of the problem and a photocopy of the purchase receipt. Upon receipt of the package
the problem will be evaluated as quickly as possible.

READ THROUGH THIS MANUAL BEFORE STARTING
CONSTRUCTION. IT CONTAINS IMPORTANT WARNINGS
AND INSTRUCTIONS CONCERNING THE ASSEMBLY
AND USE OF THIS MODEL.

GPMZ0303 for GPMA1275 V1.0© Copyright 2005

Champaign, Illinois

[phone], Ext 5

[e-mail]

INSTRUCTION MANUAL

Wingspan: 33.5 in [850mm]
Wing Area: 369 sq in [24 dm2]
Weight: 14-15 oz [380–400 g]
Wing Loading: 5 oz/sq ft [17–20 g/dm2]
Length: 36.5 in [925mm]
Radio: 4-channel w/ 4 micro ser vos and 30A brushed ESC
Power System: Ball-bearing 280-sized motor, 5:1 reduction gearbox (included)

™

2

INTRODUCTION................................................................2

AMA ...................................................................................2

SAFETY PRECAUTIONS..................................................2

LITHIUM BATTERY HANDLING AND USAGE.................3

ADDITIONAL ITEMS REQUIRED.....................................3

Radio Equipment and Electronics ...............................3

Adhesives and Building Supplies.................................3

Optional Supplies and Tools ........................................3

IMPORTANT BUILDING NOTES.......................................4

ORDERING REPLACEMENT PARTS...............................4

KIT CONTENTS .................................................................5

ASSEMBLE THE AIRFRAME ...........................................6

SET UP THE RADIO SYSTEM..........................................8

INSTALL THE PROPULSION SYSTEM..........................11

APPL Y THE DECALS ......................................................12

GET THE MODEL READY TO FLY..................................12

Check the Control Directions.....................................12

Set the Control Throws..............................................13

Balance the Model (C.G.)..........................................13

Balance the Model Laterally......................................13

PREFLIGHT.....................................................................14

Identify Your Model.....................................................14

Charge the Batteries ..................................................14

Range Check.............................................................14

MOTOR SAFETY PRECAUTIONS..................................14

AMA SAFETY CODE ......................................................14

CHECK LIST ....................................................................15

FLYING.............................................................................15

Launch.......................................................................15

Flight............................................................Back Cover

Landing........................................................Back Cover

Crashing......................................................Back Cover

Whether you’ re just learning aerobatics or are a seasoned 3D
veteran, you’ll enjo y the U-CAN-DO 3D EP ARF.This airplane
combines the proven flight characteristics of the U-CAN-DO
3D family with inexpensive, easy-to-operate electric power
and an extremely resilient structure. When your airplane is
capable of bouncing back from unintended impacts with

terra

firma

, it’s just that much easier to learn to do maneuvers like

torque rolls, harriers, high-alpha rolls, etc.
The EPP material that the U-CAN-DO 3D EP ARF is made

of allows it to bounce back from most crashes – just pick it
up, dust it off, and launch it again.Just because the airplane
is capable of withstanding crashes doesn’t mean it is
completely indestructible, however. If you drive the airplane
straight down into the ground at full throttle, y ou will probably
be making some repairs.

Take care to build straight and true as you complete the
airplane. Misaligned parts will hur t the airplane’s ability to
perform the extreme aerobatics it is designed for.

For the latest technical updates or manual corrections to the
U-CAN-DO 3D EP ARF visit the Great Planes web site at

www.greatplanes.com

. Open the “Airplanes” link, then

select the U-CAN-DO 3D EP ARF. If there is new technical
information or changes to this model a “tech notice” box will
appear in the upper left corner of the page.

We urge you to join the AMA (Academy of Model Aeronautics)
and a local R/C club.The AMA is the governing body of model
aviation and membership is required to fly at AMA clubs.
Though joining the AMA provides many benefits, one of the
primary reasons to join is liability protection. Coverage is not
limited to flying at contests or on the club field. It even applies
to flying at public demonstrations and air shows. Failure to
comply with the Safety Code (excerpts printed in the back of
the manual) may endanger insurance coverage. Additionally,
training programs and instructors are available at AMA club
sites to help you get started the right way. There are over
2,500 AMA chartered clubs across the countr y. Contact the
AMA at the address or toll-free phone number below:

Academy of Model Aeronautics

5151 East Memorial Drive

Muncie, IN 47302-9252

Tele.[phone]

Fax [phone]

Or via the Internet at:

http://www.modelaircraft.org

IMPORTANT!!! Two of the most important things you can do
to preserve the radio controlled aircraft hobby are to avoid
flying near full-scale aircraft and avoid flying near or over
groups of people.

1.Your U-CAN-DO 3D EP ARF should not be considered a
toy, but rather a sophisticated, working model that functions
very much like a full-size airplane. Because of its
performance capabilities, the U-CAN-DO 3D EP ARF, if not
assembled and operated correctly, could possibly cause
injury to yourself or spectators and damage to property.

2. You must assemble the model according to the
instructions. Do not alter or modify the model, as doing so
may result in an unsafe or unflyable model. In a few cases
the instructions may differ slightly from the photos.In those
instances the written instructions should be considered
as correct.

PRO TECT YOUR MODEL,Y OURSELF

& OTHERS...FOLLOW THESE

IMPORTANT SAFETY PRECAUTIONS

AMA

INTRODUCTION

TABLE OF CONTENTS

3

3.You must take time to build straight, true and strong.

4. You must use an R/C radio system that is in first-class
condition, and a correctly sized engine and components
(fuel tank, wheels, etc.) throughout the building process.

5.You must correctly install all R/C and other components so
that the model operates correctly on the ground and in the air .

6.You must check the operation of the model before every
flight to insure that all equipment is operating and that the
model has remained structurally sound. Be sure to check
clevises or other connectors often and replace them if they
show any signs of wear or fatigue.

7. If you are not an experienced pilot or have not flown this
type of model before, we recommend that you get the
assistance of an experienced pilot in your R/C club for your
first flights.If you’re not a member of a club, your local hobb y
shop has information about clubs in your area whose
membership includes experienced pilots.

8. While this kit has been flight tested to exceed normal use,
if the plane will be used for extremely high stress flying, such
as racing, or if an engine larger than one in the recommended
range is used, the modeler is responsible for taking steps to
reinforce the high stress points and/or substituting hardware
more suitable for the increased stress.

Remember:Take y our time and f ollo w the instructions to
end up with a well-built model that is straight and true.

WARNING!! Read the entire instruction sheet included with

this battery. Failure to follow all instructions could cause
permanent damage to the battery and its surroundings, and
cause bodily harm!

• ONLY use a Li-Po approved charger. NEVER use a
NiCd/NiMH peak charger!

• NEVER charge in excess of 4.20V per cell.

• ONLY charge through the “charge” lead. NEVER charge

through the “discharge” lead.

• NEVER charge at currents greater than 1C.

• ALWAYS set charger’s output volts to match battery volts.

• ALWAYS charge in a fireproof location.

• NEVER tr ickle charge.

• NEVER allow the battery temperature to exceed 150°F (65°C).

• NEVER disassemble or modify pack wiring in any way or

puncture cells.

• NEVER discharge below 2.5V per cell.

• NEVER place on combustible materials or leave unattended

during charge or discharge.

• ALWAYS KEEP OUT OF REACH OF CHILDREN.

Recommended part numbers are include in parentheses.

❏ 4-Channel radio
❏ 4 Micro ser vos (0.3 oz [9g] or less each) (FUTM0042)
❏ Micro receiver (FUTL0442-3)
❏ Two 6” servo extensions (HCAM2000)
❏ Two 12” servo extensions (HCAM2100)
❏ 30-amp brushed ESC (GPMP2030)
❏ 1500mAh 3-series Lithium Polymer battery (GPMP0831)
❏ Deans Ultra Male plug (WSDM1302)
❏ Lithium Polymer Charger (GPMP3150, GPMP3010)

In addition to common household tools and hobby tools, this
is the “short list”of the most important items required to build
the U-CAN-DO 3D EP ARF.

❏ Low-temperature hot-melt glue and glue gun
❏ 60/40 tin/lead solder
❏ 1/2 oz Pro

™

CA for the carbon pushrods (GPMR6001)

❏ Covering iron (or household iron)
❏ Hobby knife with #11 blade

Here is a list of optional tools mentioned in the manual that
will help you build the U-CAN-DO 3D EP ARF.

❏ Stick-on segmented lead weights (GPMQ4485)
❏ 2 oz. [57g] spray CA activator (GPMR6035)
❏ CA applicator tips (HCAR3780)
❏ Robar t Super Stand II (ROBP1402)

Optional Supplies and Tools

Adhesives and Building Supplies

Radio Equipment and Electronics

ADDITIONAL ITEMS REQUIRED

LITHIUM BATTERY

HANDLING AND USAGE

We, as the kit manuf acturer, provide y ou with a top quality,
thoroughly tested kit and instructions, but ultimately the
quality and flyability of your finished model depends on
how you build it; therefore, we cannot in any way
guarantee the performance of your completed model, and
no representations are expressed or implied as to the
performance or safety of your completed model.

4

• When you see the term

test fit

in the instructions, it means
that you should first position the part on the assembly
without using any glue, then slightly modify or

custom fit

the part as necessar y for the best fit.

• Whenever the term

glue

is written you should rely upon
your experience to decide what type of glue to use.When
a specific type of adhesive works best for that step, the
instructions will make a recommendation. We recommend

using low-temperature hot melt glue for construction, but
some silicone adhesives (Shoe Goo, Goop, etc.) also work
well. When using hot-melt glue, it is possible to
disassemble parts after construction. Simply heat your
glue gun, and run the tip along the glue joint without
squeezing new glue into the joint.The glue will soften and
you can pull the apart the joint.

Do not use standard CA

glue on this model as it will dissolve the structure.

• Photos and sketches are placed before the step they

refer to .Frequently you can study photos in following steps
to get another view of the same parts.

IMPORTANT BUILDING NOTES

ORDERING REPLACEMENT PARTS

Replacement parts for the Great Planes U-CAN-DO 3D EP ARF are available using the order numbers in the Replacement
Parts List that follows.The fastest, most economical service can be provided by your hobby dealer or mail-order company.

To locate a hobby dealer, visit the Great Planes web site at

www.greatplanes.com

. Choose “Where to Buy” at the bottom
of the menu on the left side of the page. Follow the instructions provided on the page to locate a U.S., Canadian or
International dealer. If a hobby shop is not available, replacement parts may also be ordered from Tower Hobbies at

www.towerhobbies.com

, or by calling toll free [phone].

Parts may also be ordered directly from Hobby Services by calling [phone], or via facsimile at [phone], but
full retail prices and shipping and handling charges will apply. Illinois and Nevada residents will also be charged sales tax.
If ordering via fax, include a Visa®or MasterCard®number and expiration date for payment.
Mail parts orders and payments by personal check to:

Hobby Services

3002 N Apollo Drive, Suite 1

Champaign IL 61822

Be certain to specify the order number exactly as listed in the Replacement Parts List.Payment by credit card or personal
check only; no C.O.D. If additional assistance is required for any reason contact Product Support by e-mail at

[e-mail]

, or by telephone at [phone].

Replacement Parts List

Order Number Description How to Purchase

Missing pieces ................................................Contact Product Support

Instruction manual...........................................Contact Product Support

Full-size plans.................................................Not available

Kit parts listed below .......................................Hobby Supplier

GPMG0215.............Gear Drive

GPMG0860.............Replacement Shaft with Spur Gear

GPMG0239.............Pinion Gear

GPMG0311.............Replacement Motor

GPMA2786 .............11x4.7 Propeller

GPMQ4620.............Prop Saver

GPMA2785 .............Hardware Bag

GPMA2787 .............Decal Set

GPMG0216.............Motor/Gear Drive Assembly

GPMA2788 .............Cowl

GPMA2789 .............Wing

GPMA2790 .............Fuselage

GPMA2791 .............Tail Set

5

Before starting to build, take an inventory of this kit to make sure it is complete, and inspect the parts to make sure they
are of acceptable quality.If any parts are missing or are not of acceptable quality, or if y ou need assistance with assemb ly,
contact Product Support. When repor ting defective or missing parts, use the part names exactly as they are written in
the Kit Contents list.

Great Planes Product Support:

3002 N Apollo Drive, Suite 1

Champaign, IL 61822

Telephone: [phone], ext. 5

Fax: [phone]

E-mail:

[e-mail]

KIT INSPECTION

1 Wing
2 Ailerons (2)
3 Fuselage
4 Stabilizer
5 Elevator Halves (2)

6 Elevator Joiner
7 Propeller
8 Rubber Bands
9 Prop Saver

10 Motor/Gearbox Assembly

Kit Contents (Photographed)

Control Horns (4)
Control Horn Retainers (4)
Z-Bend Clevises (8)
Small-Spline Servo Arms (4)
Medium-Spline Servo Arms (4)
Large-Spline Servo Arms (4)

1x130mm Carbon Aileron Pushrods (2)
1x150mm Carbon Rudder Pushrod
1x80mm Carbon Elevator Pushrod
Nylon Pinned Hinges (8)
Hook-and-Loop Fastener
Gearbox Screw

Kit Contents (Not Photographed)

KIT CONTENTS

1

10

2

3

6

8

9

7

2

5

5

4

❏ 1. Slide the horizontal stabilizer into the slot at the rear of

the fuselage. Check the alignment using the sketch above
as a reference. Be careful not to flex the fuselage as you
make measurements.

❏ 2. When you are satisfied with the alignment of the

stabilizer, glue it in place with low-temperature hot-melt glue
or shoe goo type adhesive.

“Welding”EPP with Hot-Melt Glue

When gluing EPP parts together with hot-melt glue, you can
use this technique to create a very strong bond if the parts
form an angle between them.

A. Run a small bead in the cor ner between the two par ts.

B. Use the glue-gun tip to re-melt the glue bead, causing it

to penetrate into the joint and form into a fillet. The gun tip
will also slightly melt the foam, allowing the glue to fuse with
it somewhat, forming a

very

strong joint.

❏ 3.Slide the wing into the cutout in the fuselage. Pull the

aileron servo lead strings up into the cockpit.

❏ 4. Make sure the wing is centered and square in the

fuselage, and parallel with the stabilizer when viewed from
the front. Again, be careful not to flex the fuselage as you
make your measurements.

AA

BB

B=B

A=A

ASSEMBLE THE AIRFRAME

6

B

B=B

B

F

A

A=A

A

O
A
M

Glue Fillet

FOAM

F
O
A

M

Glue Bead

FOAM

❏ 5.When you are satisfied with the alignment of the wing,

glue it in place with hot-melt glue.

❏ 6. Use hot-melt glue to secure four hinges in the precut

slots in each aileron. Do not worry about a little excess glue
squeezing out onto the hinge pivots–it is easily removed
with a hobby knife after the glue hardens.

❏ 7. Test fit the ailerons to the wings.If necessary, enlarge

the precut hinge slots with a hobby knife.

❏ 8. Glue the outermost hinge into the wing, making sure

to keep the hinge line parallel with the TE of the wing.

❏ 9. Using the flex of the aileron to allow you to glue one

hinge in at a time, work your way inward until all four hinges
are glued in place.

❏ 10. Use a hobby knife to clean any excess glue from

the hinges.

7

❏ 11. Slide the 3mm carbon elevator joiner tube into the

plastic tubes on the stabilizer.Make sure it is centered.

❏ 12. Run a small bead of hot melt glue into the groove on

the leading edge of an elevator half. Run the glue-gun tip
back through the bead to re-melt and spread it, and press
the elevator half onto the joiner tube.

❏ 13. Repeat the previous step with the other elevator half,

making sure to keep the elevator halves aligned with each
other.The trailing edge of the elevator should be even when
viewed from behind.

❏ 1. Secure a 6" extension to each of your aileron servos

with tape or heat-shrink tubing. Use the strings in the wings
to pull the leads through into the cockpit area.

❏ 2. Use hot-melt glue to glue the servos into the wing

cutouts with the output shafts forward.

❏ 3. Secure 12" extensions to your tail servos using tape or

heat shrink tubing. Use the string in the fuselage to pull both
servo leads into the cockpit area.

❏ 4. Glue the tail servos into the cutout in the fuselage with

hot-melt glue. Both servos should have their output shafts
toward the front of the airplane, and the lower servo should
project out the left side of the plane, while the upper servo
projects out the right side.

SET UP THE RADIO SYSTEM

8

❏ 5. Cut a slot in the left elevator half in the location shown.

The front of the slot is even with the start of the hinge bevel
on the elevator.

❏ 6.Cut a slot in the rudder in the location shown.The front of

the slot is even with the start of the hinge bevel on the rudder.

❏ 7. Cut a slot in each aileron in the location shown. The

front of the slots are even with the start of the hinge bevels
on the ailerons.

❏ 8. Press a plastic z-bend clevis into each of the four

control horns.

❏9.Glue a control horn into the underside of the elevator half.

❏ 10.Secure the back side of the control horn with a control

horn retainer. Secure it with a small bead of glue.

Elevator Cross Section

9

Bevel

Slot

Elevator Leading Edge

❏ 11. Install a control horn into the right side of the rudder

using the same procedure.

❏ 12. Install control horns in the underside of the ailerons

using the same procedure.

❏ 13. Remove the servo arms from all of your servos. Find

4 long output arms with the spline size that fits your servos.
Press a plastic z-bend clevis into the outer hole on each of
these arms.

❏ 14. Center all ser vos with your radio.

❏ 15. Install a servo arm pointing straight up onto your

elevator servo. Slide an 80mm long, 1mm carbon rod
through the clevises on the servo and the control horn.
Adjust the linkage by sliding the rod in the clevises until you
have the elevator straight when the servo is centered.Once
you are satisfied with the linkage, secure it with a

small

drop
of thin CA between the clevises and the rod.Be very careful
not to get CA in the pivoting joint between the horns and the
clevises, or on the foam parts of the model.

❏ 16. Set up the rudder linkage using the same technique.

❏ 17.Set up the aileron linkages using the same techniques.

In this case, both servo arms should be offset 15 degrees
forward to create a small amount of aileron differential.

10

❏ 1. If necessary, extend the motor wires on your ESC so

that they are at least 8" [203mm] long.

❏ 2. Pull the ESC output wires forward from the canopy and

out the hole in the firewall using the preinstalled string.

❏ 3. Solder your ESC output wires to the motor.The positive

pole is marked by a red dot. Solder the wires to the same
point that the capacitors and brush wires are presoldered to.

❏ 4. Slide the gearbox assembly onto the motor stick. Line

the hole in the gearbox up with the hole in the motor stick,
and secure it with a small wood screw.

❏ 5. Install the prop saver onto the gearbox output shaft.

make sure that the screws seat down into the two flat spots
on the shaft.

❏ 6. Install the cowl onto the nose. Secure it with 4 small

drops of hot melt glue. This will make it easy to remove if
needed for motor maintenance or replacement.

INSTALL THE PROPULSION SYSTEM

11

❏ 7. Install the hook side of the hook and loop fastener into

the battery compar tment.

❏ 8. Secure the propeller to the prop saver using two

rubber bands. An APC or GWS 11X4.7 slow-flyer propeller
will also work for this airplane.

❏ 9. Drill two 1/16" holes through the fin.Route the receiver

antenna out the back of the canopy opening and “stitch” it
through the two holes in the fin.

1.Use scissors or a sharp hobby knife to cut the decals from
the sheet.

2. Be certain the model is clean and free from oily
fingerprints and dust. Prepare a dishpan or small bucket with
a mixture of liquid dish soap and warm water—about one
teaspoon of soap per gallon of water.Submerse the decal in
the soap and water and peel off the paper backing. Note:
Even though the decals hav e a “sticky-back”and are not the
water transfer type , submersing them in soap & water allo ws
accurate positioning and reduces air bubbles underneath.

3. Position decal on the model where desired. Holding the
decal down, use a paper towel to wipe most of the water a way.

4.Use a piece of soft balsa or something similar to squeegee
remaining water from under the decal. Apply the rest of the
decals the same way.

❏ 1. Turn on the transmitter and receiver and center the

trims. If necessary, remove the servo arms from the servos
and reposition them so they are centered. Reinstall the
screws that hold on the servo arms.

❏ 2. With the transmitter and receiver still on, check all the

control surfaces to see if they are centered.If necessary, adjust
the clevises on the pushrods to center the control surfaces.

❏ 3. Make cer tain that the control surfaces and the speed

control respond in the correct direction as shown in the
diagram.If any of the controls respond in the wrong direction,
use the servo reversing in the transmitter to reverse the
servos connected to those controls. Be cer tain the control
surfaces have remained centered. Adjust if necessary.

Check the Control Directions

GET THE MODEL READY TO FLY

APPLY THE DECALS

12

4-CHANNEL RADIO SETUP

(STANDARD MODE 2)

4-CHANNEL

TRANSMITTER

ELEVATOR MOVES UP

4-CHANNEL

TRANSMITTER

RIGHT AILERON MOVES UP

LEFT AILERON MOVES DOWN

RUDDER MOVES RIGHT

FULL THROTTLE

4-CHANNEL

TRANSMITTER

4-CHANNEL

TRANSMITTER

Use a ruler to accurately measure and set the control throw of
each control surface as indicated in the chart that follows.If your
radio does not have dual rates, we recommend setting the
throws at the high rate setting.NOTE:The throws are measured
at the widest part of the elevators, rudder and ailerons.

At this stage the model should be in ready-to-fly condition
with all of the systems in place including the engine, landing
gear, covering and paint, and the radio system.

❏ 1.Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately

mark the C.G. on the top of the wing on both sides of the
fuselage. The C.G. is located 2-7/8" [73mm] back from

the leading edge of the wing.

❏ 2. With all parts of the model installed, including the

battery (ready to fly) lift it upside-down on your fingertips at
the balance point you marked.

❏ 3. If the tail drops, the model is “tail heavy”and the battery

pack and/or receiver must be shifted forward or weight must
be added to the nose to balance.If the nose drops, the model
is “nose heavy”and the battery pack and/or receiver must be
shifted aft or weight must be added to the tail to balance. If
possible, relocate the battery pack and receiver to minimize
or eliminate any additional ballast required. If additional
weight is required, begin by placing incrementally increasing
amounts of weight on the bottom of the fuse until the model
balances. Once you have determined the amount of weight
required, it can be permanently attached.

❏ 4. IMPORTANT: If you found it necessary to add any

weight, recheck the C.G. after the weight has been
permanently installed.

❏ 1. With the wing level, have an assistant help you lift the

model by the engine propeller shaft and the bottom of the
fuse under the TE of the fin.Do this several times.

❏2.If one wing always drops when you lift the model, it means

that side is heavy.Balance the airplane by adding weight to the
other wing tip. An airplane that has been laterally balanced

will track better in loops and other maneuvers.

Balance the Model Laterally

This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 1/2" [12.7mm] forward or 3/8" [9.5mm] back to
change the flying characteristics. Moving the C.G. forward
may improve the smoothness and stability, but the model
may then require more speed for tak eoff and mak e it more
difficult to slow for landing.Moving the C.G.aft makes the
model more maneuverable, but could also cause it to
become too difficult to control. In any case, start at the
recommended balance point and do not at any time
balance the model outside the specified range.

More than any other factor, the C.G. (balance point) can
have the greatest effect on how a model flies, and may
determine whether or not your first flight will be
successful. If you value this model and wish to enjoy it for
many flights, DO NOT OVERLOOK THIS IMPORTANT
PROCEDURE. A model that is not proper ly balanced will
be unstable and possibly unflyable.

Balance the Model (C.G.)

IMPORTANT: The U-CAN-DO 3D EP ARF has been
extensively flown and tested to arrive at the throws at

which it flies best. Flying your model at these throws will
provide you with the greatest chance for successful first
flights. If, after you have become accustomed to the way
the U-CAN-DO 3D EP ARF flies, you would like to change
the throws to suit your taste, that is fine. However, too
much control throw could make the model difficult to
control, so remember, “more is not always better.”

These are the recommended control surface throws:

High Rate Low Rate

ELEVATOR: 3" [76mm] up 1-1/2" [38mm] up

3" [76mm] down 1-1/2" [38mm] down

RUDDER: 4-1/2" [114mm] right 1-1/2" [38mm] right

4-1/2" [114mm] left 1-1/2" [38mm] left

AILERONS: 2-5/8" [67mm] up 1" [25mm] up

2" [51mm] down 7/8" [22mm] down

Set the Control Throws

13

2-7/8" [73mm]

No matter if you fly at an AMA sanctioned R/C club site or if you
fly somewhere on your own, you should always have your
name, address, telephone number and AMA number on or
inside your model.It is required at all AMA R/C club flying sites
and AMA sanctioned flying events. Fill out the identification tag
on the decal sheet and place it on or inside your model.

Follow the battery charging instructions that came with your
radio control system to charge the batteries.You should always
charge your transmitter batteries the night before you go flying,
and at other times as recommended by the radio manuf acturer.

Charge the flight battery using a charger designed for
Lithium Polymer batteries. Charging with any other type of
charger is very dangerous, and may cause the batteries to
combust violently.

Ground check the operational range of your r adio before the
first flight of the day. With the transmitter antenna collapsed
and the receiver and transmitter on, you should be able to
walk at least 100 feet away from the model and still have
control. Have an assistant stand by your model and, while
you work the controls, tell you what the control surfaces are
doing. Repeat this test with the motor running at various
speeds with an assistant holding the model, using hand
signals to show you what is happening. If the control
surfaces do not respond correctly, do not fly! Find and
correct the problem first.Look for loose servo connections or
broken wires, corroded wires on old servo connectors, poor
solder joints in your battery pack or a defective cell, or a
damaged receiver crystal from a previous crash.

Keep your f ace and body as w ell as all spectators a wa y from
the plane of rotation of the propeller whenever the battery
is connected.

Keep these items away from the prop: loose clothing, shir t
sleeves, ties, scarfs, long hair or loose objects such as
pencils or screwdrivers that may fall out of shirt or jacket
pockets into the prop.

Read and abide by the following excerpts from the Academy
of Model Aeronautics Safety Code.For the complete Safety
Code refer to

Model Aviation

magazine, the AMA web site or

the Code that came with your AMA license.

1) I will not fly my model aircraft in sanctioned events , air shows,

or model flying demonstrations until it has been proven to be
airworthy by having been pre viously , successfully flight tested.

2) I will not fly my model aircraft higher than approximately

400 feet within 3 miles of an airport without notifying the
airpor t operator. I will give right-of-way and avoid flying in
the proximity of full-scale aircraft. Where necessary, an
observer shall be utilized to supervise flying to avoid
having models fly in the proximity of full-scale aircraft.

3) Where established, I will abide by the safety rules for the

flying site I use, and I will not willfully and deliberately fly my
models in a careless, reckless and/or dangerous manner.

5) I will not fly my model unless it is identified with my name

and address or AMA number, on or in the model. Note:
This does not apply to models while being flown indoors.

7) I will not operate models with pyrotechnics (any device

that explodes, burns, or propels a projectile of any kind).

1) I will have completed a successful radio equipment ground

check before the first flight of a new or repaired model.

2) I will not fly my model aircraft in the presence of

spectators until I become a qualified flier, unless assisted
by an experienced helper.

3) At all flying sites a straight or curved line(s) must be

established in front of which all flying takes place with the
other side for spectators. Only personnel involved with

Radio Control

General

AMA SAFETY CODE (

EXCERPTS

)

Failure to follow these safety precautions may result
in severe injury to yourself and others.

MOTOR SAFETY PRECAUTIONS

Range Check

CAUTION: Unless the instructions that came with your

radio system state differently, the initial charge on new
transmitter batteries should be done for 15 hours using
the slow-charger that came with the radio system.This
will “condition” the batteries so that the next charge may
be done using the fast-charger of your choice.If the initial
charge is done with a fast-charger the batteries may not
reach their full capacity and you may be flying with
batteries that are only partially charged.

Charge the Batteries

Identify Y our Model

PREFLIGHT

14

flying the aircraft are allowed at or in the front of the flight
line. Intentional flying behind the flight line is prohibited.

4) I will operate my model using only radio control
frequencies currently allowed by the Federal
Communications Commission.

5) I will not knowingly operate my model within three

miles of any pre-existing flying site except in
accordance with the frequency sharing agreement
listed [in the complete AMA Safety Code].

9) Under no circumstances may a pilot or other person
touch a powered model in flight; nor should any part of

the model other than the landing gear intentionally
touch the ground, except while landing.

❏ 1. Check the C.G. according to the measurements

provided in the manual.

❏ 2. Be certain the battery and receiver are securely

mounted in the fuse. Simply stuffing them into place
with foam rubber is not sufficient.

❏ 3. Extend your receiver antenna and make sure it has a

strain relief inside the fuselage to keep tension off the
solder joint inside the receiver.

❏ 4. Balance your model

laterally

as explained in

the instructions.

❏ 5. Use threadlocking compound to secure critical

fasteners such as the set screws that hold the wheel
axles to the struts, screws that hold the carburetor arm
(if applicable), screw-lock pushrod connectors, etc.

❏ 6. Make sure all hinges are securely glued in place.
❏ 7. Confirm that all controls operate in the correct direction

and the throws are set up according to the manual.

❏ 8. Secure connections between servo wires and

Y-connectors or servo extensions , and the connection
between your battery pack and the on/off switch with
vinyl tape, heat shrink tubing or special clips suitable
for that purpose.

❏ 9. Make sure any servo extension cords you may have

used do not interfere with other systems (servo arms,
pushrods, etc.).

❏ 10. Balance your propeller (and spare propellers).
❏ 11.Place your name, address, AMA number and telephone

number on or inside your model.

❏ 12. If you wish to photograph your model, do so before

your first flight.

❏ 13.Range check your radio when you get to the flying field.

The U-CAN-DO 3D EP ARF is a great-flying model that flies
smoothly and predictably. The U-CAN-DO 3D EP ARF does
not, however, possess the self-recovery characteristics of a
primary R/C trainer and should be flown only by experienced
R/C pilots.

For the first flight, it is a good idea to hav e a friend launch the
airplane for you. This allows you to keep your hands on the
radio sticks and correct any trim problems that are present.

Have your friend hold the U-CAN-DO 3D EP ARF by the
canopy.Throttle up to full power, and hav e y our friend give the

Launch

CAUTION (THIS APPLIES TO ALL

R/C AIRPLANES): If,
while flying, you notice an alarming or unusual sound
such as a low-pitched “buzz,” this may indicate control
surface

flutter.

Flutter occurs when a control surface (such
as an aileron or elevator) or a flying surface (such as a
wing or stab) rapidly vibrates up and down (thus causing
the noise). In extreme cases, if not detected immediately,
flutter can actually cause the control surface to detach or
the flying surface to fail, thus causing loss of control
followed by an impending crash. The best thing to do
when flutter is detected is to slow the model immediately
by reducing power, then land as soon as safely possible.
Identify which surface fluttered (so the problem may be
resolved) by checking all the servo grommets for
deterioration or signs of vibration. Make certain all
pushrod linkages are secure and free of play. If it fluttered
once, under similar circumstances it will probably flutter
again unless the problem is fixed.Some things which can
cause flutter are; Excessive hinge gap; Not mounting
control horns solidly; Poor fit of clevis pin in horn; Side­play of wire pushrods caused by large bends; Excessive
free play in servo gears; Insecure servo mounting; and
one of the most prevalent causes of flutter;Flying an over­powered model at excessive speeds.

FLYING

During the last few moments of preparation your mind may
be elsewhere anticipating the excitement of the first flight.
Because of this, you may be more likely to overlook certain
checks and procedures that should be performed before the
model is flown.To help avoid this, a check list is provided to
make sure these important areas are not overlooked. Many
are covered in the instruction manual, so where appropriate,
refer to the manual for complete instructions. Be sure to
check the items off as they are completed.

CHECK LIST

15

plane a gentle underhanded toss at about a 30-degree angle
upward. Since this air plane has a very high thrust to weight
ratio, the plane will accelerate to flying speed almost instantly.
Climb to a comfortable altitude and throttle back to a lower
power setting.This plane flies great at about half-throttle when
in standard forward flight.

For reassurance and to keep an eye on other traffic, it is a
good idea to have an assistant on the flight line with you.Tell
him to remind you to throttle back once the plane gets to a
comfortable altitude.While full throttle is usually desirable for
takeoff, most models fly more smoothly at reduced speeds.

Tak e it easy with the U-CAN-DO 3D EP ARF for the first few
flights, gradually getting acquainted with it as you gain
confidence. Adjust the trims to maintain straight and level
flight. After flying around for a while, and while still at a safe
altitude with plenty of fuel, practice slow flight and execute
practice landing approaches by reducing the throttle to see
how the model handles at slower speeds.Add power to see
how she climbs as well. Continue to fly around, executing
various maneuvers and making mental notes (or having
your assistant write them down) of what trim or C.G.
changes may be required to fine tune the model so it flies
the way you like. Mind your fuel level, but use this first flight
to become familiar with your model before landing.

To initiate a landing approach, low er the throttle while on the
downwind leg. Allow the nose of the model to pitch
downward to gradually bleed off altitude. Continue to lose
altitude, but maintain airspeed by k eeping the nose down as
you turn onto the crosswind leg.Make your final turn toward
the landing area (into the wind) keeping the nose down to
maintain airspeed and control. Level the attitude when the
model reaches an altitude of about 10 feet, modulating the
throttle as necessary to maintain your glide path and
airspeed. If you are going to overshoot, smoothly advance
the throttle (always ready on the right rudder to counteract
torque) and climb out to make another attempt.When you’re
ready to make your landing flare and the model is a foot or
so off the deck, cut your throttle and smoothly increase up
elevator until it gently touches down on its belly.

Make sure
that you cut your power completely before touchdown, or
gearbox damage may result.

One final note about flying your model: have a goal or flight
plan in mind for every flight. This can be learning a new
maneuver(s), improving a maneuver(s) y ou already kno w, or
learning how the model behaves in certain conditions (such
as on high or low rates). This is not necessarily to improve
your skills (

though it is never a bad idea!)

, but more

importantly so you do not surprise yourself by impulsively

attempting a maneuver and suddenly finding that you’ve run
out of time, altitude or airspeed. Every maneuver should be
deliberate, not impulsive.For example, if you’re going to do
a loop, check your altitude, mind the wind direction
(anticipating rudder corrections that will be required to
maintain heading), remember to throttle back at the top, and
make certain you are on the desired rates (high/low rates).
A flight plan greatly reduces the chances of crashing your
model just because of poor planning and impulsive moves.

Remember to think.

Even though the U-Can-Do 3D EP ARF is a very durable
airplane, learning to crash properly will extend the life of
your airplane. Since this is a 3D airplane, recoveries can
happen in very little altitude, so keep trying with power to
recover until the last possible second – you may find that
you can “fly out” of a lot more crashes than you thought.

When you do know that impact is imminent,

cut your

throttle

– plowing the propeller into the ground at full power
will almost certainly strip out your spur gear. Also, try to
avoid allowing the airplane to build up speed into a crash –
keep the nose up and the speed down, and the airplane will
take impact in almost any attitude. Pound it in fast on the
nose, however, and you’ll be gluing the nose section back
on.

Have a ball!

But always stay in control and fly in a safe manner.

GOOD LUCK AND GREAT FLYING!

Crashing

Landing

Flight