FUTABA CGY755, Руководство пользователя

Страница: 69 / 112

70
WARNING
Always level the swash plate using the cyclic stick before applying throttle
and spooling up the main rotor blades. During takeoff small corrections may be
necessary. If you make large corrections while the helicopter is on the ground, it
may tip over since the helicopter is firmly on the ground and the gyros are over-
compensating due to the lack of movement.
Some helicopters may have a tendency to resonate/shake during spool up.
Always leave the helicopter on the ground until this resonance or shaking goes
away. If this issue continues, it is recommended to try some rubber skid stops or
take off from a softer surface such as grass. Vibrations contribute to this ground
resonance. Verify that everything on your model is balanced correctly.
*When the CGY is used with an ESC or BEC and a power switch is not used,
there is a possibility of an intermittent connection when connecting the flight bat-
tery. This may cause the CGY initialization to fail. Always ensure that the gyro has
initialized properly by verifying that the gyros are compensating as the helicopter
is moved. It is recommended to use a power switch on the power supply line to
avoid this possibility.
Rudder Gyro Trim Flight:
The tail rotor/rudder AFR or D/R function within the transmitter is used to adjust the
pirouette rate of the helicopter to suit your requirements. Do NOT use ATV or rudder
channel travel adjustment for this purpose. For optimum performance, the tail rotor
should be trimmed in Normal/Rate mode as closely as possible with adjustments to
the tail rotor pushrod length before finalizing with transmitter trim and then memoriz -
ing that value into the CGY.
The tail rotor gyro gain should be raised until the tail begins to oscillate quickly (also
called tail
"
wag
"
). Once this point has been achieved, reduce the gain as needed a few
percent at a time to eliminate the oscillation. Repeat the process for all flight condi -
tions. The main rotor speed, tail rotor ratio, tail rotor pitch range and tail blade length
play a large part in achieving optimum tail rotor performance. The gain value can
vary drastically from model to model, and the exact value should not play a part in
the evaluation of the gyro’s performance.