User manual

The flaperon arrangement enables the ailerons not only to move in the usual opposite
directions to produce roll, but also to move together downward to produce flap action (and
possibly upward to produce spoiler action), thus controlling lift and drag.
This dual function capability requires that each aileron servo have its own channel:
normally channel 2 for right aileron (RAil) and channel 6 for left aileron (LAil). The
stabilizer passes the control inputs sent by the transmitter through to the two aileron
channels. The inputs can include not only flaperon mixing but also differential aileron
(more up than down to compensate for adverse aileron drag). Unlike V-tail and Elevon,
where the mixing happens in the stabilizer, aileron/flaperon mixing takes place in the
transmitter. For the stabilizer to apply corrections to both ailerons in response to wind
gusts, etc., switch J6 must be ON. (If it is OFF, only the right aileron (CH2) will have
stabilizer action.) In the transmitter, wing type should be set to Dual Aileron or Flaperon,
as appropriate. If flaperon is used, then Flap mixing must be applied; this usually includes
mixing to the elevator channel to compensate for the pitch effects of flap action. Also,
differential aileron can be applied if required. In the receiver, DIP switch J6 (flaperon) is ON
to enable stabilization on the second aileron channel. DIP switches J4 and J5 are ON (except
for a model with a V-tail, when J4 must be OFF) . The right and left aileron servos are
plugged into channels 2 and 6 respectively.
Reversing Controls and Corrections
The direction of response of the control surfaces to the transmitter inputs must be checked
and corrected, if necessary, AFTER any mixing is set up for V-Tail, Elevons and Flaperons.
To avoid distracting control surface motions, stabilizer action should be turned OFF with
the Gear switch during this process (mixing occurs whether the stabilizer is on or off).
Note that it may be necessary not only to use channel reversing in the transmitter but also
to interchange the plugs of the two servos involved in the control mixing. For example, if
both V-tail surfaces move sideways when the elevator Stick is moved, interchange the plugs
in channels 3 and 4. Then use channel reverse in the transmitter to adjust the direction.
When all control settings and mixing are completed, and the control directions are correct,
the direction of the stabilizer’s response to a flight disturbance must be set for each axis.
Checking must be done with the stabilizer turned ON and in accordance with the
instructions provided earlier (see page 5). To change the direction of response for an axis,
use the appropriate DIP switch: J1 (aileron), J2 (elevator) or J3 (rudder).
Recalibrating the Gyros
The stabilizer as supplied is fully calibrated and normally requires no further adjustment. A
problem in manufacturing, or a situation such as operation in temperatures far from the
nominal 25 degrees Celsius (77F), might require recalibration of the gyros to avoid control
surface offset when stabilization is turned on.
What causes the problem?
The stabilizer reads gyro values and multiplies them by the gains set by the
potentiometers; this creates output values used to generate corrections that drive the
servos. Every gyro has an inherent offset that is calibrated out when the stabilizer is
manufactured. Normally, this initial calibration lasts for the life of the stabilizer, but if for