Specifi cations
Component List
Installed
Motor:
BL180 Brushless Outrunner Motor, 2500Kv
Receiver :
DSM2 6 Ch Ultra Micro AS3X
®
Receiver BL-ESC
(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)
Optional Parts and Accessories
Trouble Shooting
©2015 Horizon Hobby, LLC.
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.
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.
Patents pending.
UMX
™
J-3 Cub
Instruction Manual
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.
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
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.
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.
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.
Register your product online at www.e-fl iterc.com
Created 12/15 48975.1 (EN)
Problem
Possible Cause
Solution
AS3X
Control surfaces not
at neutral position
when transmit-
ter controls are at
neutral
Control surfaces may not have been mechanically centered
from factory
Center control surfaces mechanically by adjusting the U-bends
on control linkages
Aircraft was moved after the fl ight battery was connected and
before sensors initialized
Disconnect and reconnect the fl ight battery while keeping the
aircraft still for 5 seconds
Model fl ies incon-
sistently from fl ight
to fl ight
Aircraft was not kept immobile for 5 seconds after battery was
plugged in
Keep the aircraft immobile for 5 seconds after plugging in the
battery
Trims are moved too far from neutral position
Neutralize trims and mechanically adjust linkages to center
control surfaces
Controls oscillate in
fl ight, (model rapidly
jumps or moves)
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
Aircraft will not
respond to throttle
but responds to
other controls
Throttle stick and/or throttle trim too high
Reset controls with throttle stick and throttle trim at lowest
setting
Throttle channel is reversed
Reverse throttle channel on transmitter
Motor disconnected from receiver
Open fuselage and make sure motor is connected to the receiver
Extra propeller noise
or extra vibration
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-
ler
Reduced fl ight time
or aircraft under-
powered
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
LED on receiver
fl ashes and aircraft
will not bind to
transmitter (during
binding)
Transmitter too near aircraft during binding process
Power off transmitter, move transmitter a larger distance from
aircraft, disconnect and reconnect fl ight battery to aircraft and
follow binding instructions
Bind switch or button not held long enough during bind
process
Power off transmitter and repeat bind process. Hold transmitter
bind button or switch until receiver is bound
Aircraft or transmitter is too close to large metal object, wire-
less source or another transmitter
Move aircraft and transmitter to another location and attempt
binding again
LED on receiver
fl ashes rapidly and
aircraft will not re-
spond to transmitter
(after binding)
Less than a 5-second wait between fi rst powering on transmit-
ter and connecting fl ight battery to aircraft
Leaving transmitter on, disconnect and reconnect fl ight battery
to aircraft
Aircraft bound to different model memory (ModelMatch
™
radios only)
Select correct model memory on transmitter and disconnect and
reconnect fl ight battery to aircraft
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)
Select the right transmitter or bind to the new one
Aircraft or transmitter is too close to large metal object, wire-
less source or another transmitter
Move aircraft and transmitter to another location and attempt
linking again
Control surface does
not move
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
needed
Flight battery charge is low
Fully recharge fl ight battery
Control linkage does not move freely
Make sure control linkage moves freely
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
as needed)
Motor power quickly
decreases and in-
creases then motor
loses power
Battery power is down to the point of receiver/ESC Low Voltage
Cutoff (LVC)
Recharge fl ight battery or replace battery that is no longer
performing
Motor/ESC is not
armed after landing
Over Current Protection (OCP) stops the motor when the trans-
mitter throttle is set high and the propeller cannot turn
Fully lower throttle and throttle trim to arm ESC
Servo locks or
freezes at full travel
Travel adjust value is set above 100%, overdriving servo
Set Travel adjust to 100% or less and/or set sub-trims to zero
and adjust linkages mechanically
16.9 in (430mm)
26.4 in (670mm)
3.6oz,
(102g)
Wing Area: 100.1 sq. in.
(646 sq. cm.)
i
i
i
Replacement Parts
i
Part #
Description
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
Part #
Description
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
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
