E-flite UMX Yak 54 180 BNF - Manual (Page 9)

9
EN
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. 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 Flights
For best performance with AS3X, it is important
that excessive trim is not used. If the aircraft re-
quires 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
Control Horn Settings
The illustration shows linkage positions chosen for
the most aerobatic response. Linkage connections
on the control horns directly affect aircraft response.
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.
EXTREME EXTREME
Aileron Elevator Rudder
Dual Rates and Expos
To obtain the best fl ight performance, we
recommend using a DSM2/DSMX radio capable
of adjustable Dual Rates and Expo. The suggested
settings shown here are the recommended
starting settings. Adjust according to the individual
preferences after the initial fl ight.
For activation and deactivation of Expo in the DX4e
and DX5e, refer to the next section.
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 signifi cant
noise. The noise is not an indication of a faulty
servo.
Tip: For the fi rst fl ight, fl y the model in low rate.
Dual Rate Expo
High Low High Low
Aileron 100% 70% 25% 15%
Elevator 100% 70% 30% 25%
Rudder 100% 70% 15% 5%
EXTREME 3D FLYING
INTERMEDIATE 3D FLYING
EXTREME