User Manual

ManualsBrandsE-flite ManualsAirplanesUMX Ultrix BNF Basic with AS3X and SAFE Select, 342mm

Low Voltage Cutoff (LVC)

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). Before the battery charge decreases too much, LVC removes

power supplied to the motor. Power to the motor quickly decreases and increases, showing that some battery power is

reserved for ﬂ ight control and safe landing.

When the motor power pulses, land the aircraft immediately and recharge the ﬂ ight battery.

Disconnect and remove the Li-Po battery from the aircraft after use to prevent trickle discharge. During storage, make

sure the battery charge does not fall below 3V per cell.

TIP: Due to the quiet nature of the aircraft, you may not hear the pulsing of the motor.

For your ﬁ rst ﬂ ights, set your transmitter timer or a stopwatch to 3 minutes. Adjust your timer for longer or shorter ﬂ ights

once you have ﬂ own the aircraft. Flights of 4 minutes or more are achievable if using proper throttle management.

NOTICE: Repeated ﬂ ying to LVC will damage the battery.

1 2

Arming the ESC

Arming the ESC also occurs after binding as previously described, but subsequent connection of a ﬂ ight battery requires

the steps below.

Lower throttle and throttle trim

to lowest settings.

Power on the transmitter then

wait 5seconds

Install the ﬂ ight battery and

connect it to the ESC.

Slide battery to nose

Keep plane immobile,

upright, and away from

wind for 5 seconds.

A series of tones indicates

aircraft is armed and ready.

Before the ﬁ rst ﬂ ights, or in the event of an accident, make

sure the ﬂ ight 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. Ensure SAFE Select is OFF.

2. 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.

3. When needed, use a pair of pliers to carefully bend the metal linkage (see illustration).

4. Make the U-shape narrower to make the connector shorter. Make the U-shape wider to make the linkage longer.

Centering Controls After First Flights

For best performance with AS3X, it is important that excessive trim is not used. Do not trim the aircraft while SAFE

Select is active. Always trim the aircraft in AS3X mode. If the model 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 ﬂ ight trimmed position.

Control Centering

Settings for Control Horns

The following illustration shows the factory settings for

linkages on the control horns. After the initial ﬂ ights, adjust

the linkage positions for the desired control response.

Elevons