Horizon Hobby UMX B-25 Mitchell Instruction Manual
UMX™ B-25 Mitchell
Instruction Manual
Bedienungsanleitung
Manuel d’utilisation
Manuale di Istruzioni
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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.
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 equipment (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 designed and protected for this
purpose. Moisture causes damage to electronics.
• Never place any portion of the model in your
mouth as it could 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.
Age Recommendation: Not for children under 14 years. This is not a toy.
NOTICE
All instructions, warranties and other collateral documents are subject to change at the sole discretion
of Horizon Hobby, LLC. For up-to-date 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.
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To register your product online, go to www.e-fl iterc.com
Installed
Motor: 8.5mm Brushed Motor
Receiver :
DSM2/DSMX 6 Ch Ultra Micro
AS3X® Receiver/ESC
(2) 2.3-Gram Performance Linear Long
Throw offset Servos
Needed to Complete
Recommended Battery: 300mAh 1S
3.7V 25C Li-Po
Recommended Battery Charger:
(DC) Celectra™ 1S 3.7 Variable Rate DC
Li-Po Charger
(USB) 300mAh 1S 3.7V 25C Li-Po,
26AWG with 1S to USB Charger Adapter
Recommended Transmitter:
Spektrum™ DSM2®/DSMX® full range
with dual-rates (DXe or DX4e and up)
17.17 in (436mm)
21.65 in (550mm)
3.30 oz
(93 g)
Transmitter and Receiver Binding ...........................4
Low Voltage Cutoff (LVC) ........................................4
ESC/Receiver Arming, Battery Installation
and Center of Gravity .............................................5
Control Direction Tests ...........................................6
Control Centering ...................................................7
Control Horn Settings .............................................7
Dual Rates .............................................................7
Landing Gear Installation .......................................8
Flying Tips and Repairs ..........................................9
Post Flight Checklist ..............................................9
Power Components Service .................................10
Troubleshooting Guide .........................................11
Limited Warranty .................................................12
Warranty and Service Information ........................14
IC Information ......................................................14
FCC Information ...................................................14
Compliance Information for the European Union ...15
Replacement Parts ..............................................55
Optional Parts ......................................................56
Decal Application .................................................57
Table of Contents
Specifi cations
Prefl ight Checklist
Wing Area: 63.80 sq in
(4.1 sq dm)
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 Test with
transmitter.
6. Perform AS3X Control Direction Test with
aircraft.
7. Set dual rates.
8. Adjust center of gravity.
9. Perform a radio system Range Check.
10. Find a safe and open area.
11. Plan fl ight for fl ying fi eld conditions.
12. Set fl ight timer for 4 minutes for fi rst
fl ight.
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Binding is the process of programming the receiver to recognize the GUID (Globally Unique Identifi er)
code of a single specifi c transmitter. You need to ‘bind’ your chosen Spektrum
™
DSM2/DSMX technology
equipped aircraft transmitter to the receiver for proper operation.
Any full range Spektrum DSM2/DSMX transmitter can bind to the DSM2/DSMX receiver. Please visit www.
bindnfl y.com for a complete list of compatible transmitters.
Transmitter and Receiver Binding
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. Power off your transmitter.
4. Connect the fl ight battery in the aircraft. The receiver LED will begin to fl ash rapidly (typically after
5 seconds).
5. Make sure the transmitter controls are neutral and the throttle and throttle trim are in low position.
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.
When a Li-Po battery is discharged below 3V per
cell, it will not hold a charge. The aircraft’s ESC
protects the fl ight battery from over-discharge
using Low Voltage Cutoff (LVC). Once the battery
discharges to 3V per cell, the LVC will reduce the
power to the motor in order to leave adequate
power to the receiver and servos to land the
airplane.
When the motor power decreases, land the aircraft
immediately and replace or recharge the fl ight
battery.
Always disconnect and remove the Li-Po battery
from the aircraft after each fl ight. Charge your Li-Po
battery to about half capacity before storage. Make
sure the battery charge does not fall below 3V per
cell. Failure to unplug a connected battery will result
in trickle discharge.
For your fi rst fl ights, set your transmitter timer
or a stopwatch to 4 minutes. Adjust your timer for
longer or shorter fl ights once you have fl own the
model.
NOTICE: Repeated fl ying to LVC will damage the
battery.
Low Voltage Cutoff (LVC)
For subsequent fl ights, power ON the transmitter for 5 seconds before connecting the fl ight battery.
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1-2-3-4-5 Sec.
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1
2
ESC/Receiver Arming, Battery Installation and Center of Gravity
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 occurs after binding, but
subsequent connection of a fl ight battery requires
the following steps.
AS3X
The AS3X
®
system will not activate until the
throttle stick 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. Remove the battery hatch from the fuselage.
2. Attach the battery to the hook and loop strip so
the battery is centered on the battery tray.
Center of Gravity (CG)
Measure back 35mm from the leading edge of the
wing, where the wing meets the fuselage and place
a mark. Balance the airplane on this CG mark with
all landing gear installed.
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.
35mm
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Aircraft
movement
AS3X Reaction
1. Advance the throttle above
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.
ElevatorAileronRudder
AS3X® Control Direction Test
This test ensures that the AS3X® control system is functioning properly.
Control Direction Tests
Traditional Control Direction Test
You should bind your aircraft and transmitter before doing these tests.
Move the controls 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.
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