ESC/Receiver Arming
Transmitter set up
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2
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
For subsequent fl ights, power ON the transmitter for 5 seconds before
connecting the fl ight battery.
9
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.
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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.
Dual Rates
High Low
Aileron
100%
70%
Elevator
100%
70%
Rudder
100%
70%
For the fi rst fl ight, fl y the model in low rate.
For landing, we recommend using high rate elevator.
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1-
2-
3-
4
-5
Sec.
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3
CAUTION:
Always keep hands away from the propeller. When armed, the
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.
CAUTION:
Always disconnect the Li-Po battery from the ESC when not
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.
CAUTION:
Always disconnect the Li-Po battery from the ESC when not
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.
36mm
3
Centering the Control Surfaces
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.
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 mechani-
cally 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.
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.
Make the U-shape narrower to make the
connector shorter. Make the U-shape wider to
make the linkage longer.
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.
Elev
ator
Elev
ator
1. Advance the throttle
to 25% to activate
the AS3X system.
2. Fully lower the
throttle.
3. Move the entire
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.
Once the AS3X
system is active,
control surfaces may
move rapidly. This is
normal. AS3X is active
until the battery is
disconnected.
Aileron
Aileron
Rudder
Rudder
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.
NOTICE:
Crash damage is not covered under the warranty.
CAUTION:
Always decrease
throttle at propeller
strike.
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.
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.
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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.
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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.
Post Flight Checklist
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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
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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.
Prefl ight Checklist
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i
WIDER
Replace the rear strut
included in the fl oat
set kit with the rear
strut included with the
aircraft.
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).
EN
