Horizon Hobby UMX B-25 Mitchell Manual de usuario

UMX™B-25 Mitchell

Instruction Manual

Bedienungsanleitung

Manuel d’utilisation

Manuale di Istruzioni

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, trafﬁc 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 speciﬁcally 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 ﬂying.

• 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 superﬁcial injury.

To register your product online, go to www.e-ﬂiterc.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

Speciﬁcations

Preﬂight Checklist

Wing Area: 63.80 sq in

(4.1 sq dm)



1. Charge ﬂight battery.

2. Install ﬂight 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 ﬂight for ﬂying ﬁeld conditions.

12. Set ﬂight timer for 4 minutes for ﬁrst

ﬂight.

Binding is the process of programming the receiver to recognize the GUID (Globally Unique Identiﬁer)

code of a single speciﬁc 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.

bindnﬂy.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 ﬂight battery is disconnected from the aircraft.

3. Power off your transmitter.

4. Connect the ﬂight battery in the aircraft. The receiver LED will begin to ﬂash 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 ﬂight 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 ﬂight

battery.

Always disconnect and remove the Li-Po battery

from the aircraft after each ﬂight. 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 ﬁrst ﬂights, set your transmitter timer

or a stopwatch to 4 minutes. Adjust your timer for

longer or shorter ﬂights once you have ﬂown the

model.

NOTICE: Repeated ﬂying to LVC will damage the

battery.

Low Voltage Cutoff (LVC)

For subsequent ﬂights, power ON the transmitter for 5 seconds before connecting the ﬂight battery.

1-2-3-4-5 Sec.

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 ﬂight 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 ﬂying 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 ﬂying 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 ﬁre when batteries

are charged.

35mm

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.

Before the ﬁrst ﬂight, or in the event of an

accident, make sure the ﬂight control surfaces

are centered. Adjust the linkages mechanically if

the control surfaces are not centered. Use of the

transmitter sub-trims may not correctly center the

aircraft control surfaces due to the mechanical

limits of linear servos.

1. Make sure the control surfaces are neutral

when the transmitter controls and trims are

centered. The transmitter sub-trim must

always be set to zero.

2. When needed, use a pair of pliers to carefully

bend the metal linkage (see illustration).

3. Make the U-shape narrower to make the

connector shorter. Make the U-shape wider

to make the linkage longer.

Centering Controls After First Flight

For best performance with AS3X, it is important

that excessive trim is not used. If the aircraft

requires excessive transmitter trim (4 or more clicks

of trim per channel), return the transmitter trim to

zero and adjust the linkages mechanically so that

the control surfaces are in the ﬂight

trimmed position.

Control Horn Settings

The table to the right shows the factory settings for

the control horns. Fly the aircraft at factory settings.

CAUTION: When these are incorrectly

connected for the pilot’s skill level, unexpected

aircraft response to controls can result. This can

cause damage to the aircraft and personal injury.

Elevator

Dual Rates

To obtain the best ﬂight performance, we

recommend using a DSM2/DSMX radio capable

of adjustable Dual Rates. The suggested settings

shown here are the recommended starting settings.

Adjust according to the individual preferences after

the initial ﬂight.

NOTICE: Do not set your transmitter travel adjust

over 100%. If the TRAVEL ADJUST is set over

100%, it will not result in more control movement, it

will overdrive the servo and cause damage.

It is normal for linear servos to make signiﬁcant

noise. The noise is not an indication of a faulty

servo.

Tip: For the ﬁrst ﬂight, ﬂy the model in low rate.

Dual Rate

High Low

Aileron 100% 70%

Elevator 100% 70%

Rudder 100% 70%

Control Centering

Rudder

Landing Gear Installation

1. Carefully slide the landing gear into the plastic

mounts on the bottom of the fuselage.

When needed, disassemble in reverse order.

We recommend ﬂying your aircraft outside in calm

conditions. Always avoid ﬂying near houses, trees,

wires and buildings. You should also be careful to

avoid ﬂying in areas where there are many people,

such as busy parks, schoolyards or soccer ﬁelds.

Consult local laws and ordinances before choosing

a location to ﬂy your aircraft.

Takeoff

Place the aircraft in position for takeoff (facing into

the wind if ﬂying 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 ﬂight 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 ﬂare.

During ﬂare, 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 overheating. 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.

Repairs

Repair the aircraft using foam-compatible CA

(cyanoacrylate adhesive) or clear tape. Only use

foam-compatible CA, as other types of glue can

damage the foam. When parts are not repairable,

see the Replacement Parts List for ordering by

item number.

For a listing of all replacement and optional parts,

refer to the list at the end of this manual.

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 ﬁnished ﬂying, never leave

the aircraft in direct sunlight or in a hot, enclosed

area such as a car. Doing so can damage the foam.

Flying Tips and Repairs

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.

NOTICE:

Always decrease

throttle at propeller

strike.

Power Components Service

CAUTION: DO NOT handle propeller parts

while the ﬂight battery is connected. Personal

injury could result.

Disassembly

1. Disconnect the battery from the

ESC/receiver.

2. Carefully cut at the seam on each nacelle and

remove the bottom half.

3. Hold the prop shaft using needle-nose

pliers or hemostats.

4. Turn the propellers counterclockwise (facing

the front of the model) to remove. Turn the

propeller clockwise to install.

5. Hold the nut (A) on the end of the prop

shaft using needle-nose pliers or

hemostats.

6. Turn the gear on the shaft to remove the nut.

7. Gently pull the shaft (B) from the gearbox (C)

and make sure the washer (D) and two

bushings (E) are not lost.

8. Disconnect the motor from the ESC/

receiver.

9. Gently push the motor out of the

gearbox and remove the motor

through the bottom of the nacelle.

NOTICE: DO NOT remove the gearbox from

the aircraft. Damage to the aircraft will result.

Assembly

Assemble the aircraft using the instructions

above in reverse order.

• Correctly align the prop shaft gear with the

pinion gear on the motor.

• Connect the motor to the ESC/receiver so

that the powered motor turns the propeller

counterclockwise (facing the front of the model).

• Make sure the propeller size numbers (112 x 90)

face away from the motor (see illustration).

• Attach the spinner to the propeller using foam-

compatible CA (Cyanoacrylate adhesive).

• Assemble each nacelle into place and secure with

foam-compatible CA.

112 x 90

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