Rudder and Throttle Servo Adjustments
1.Checking the servo rotation.
With the radio transmitter and receiver switched on, move the rudder and throttle sticks, and check that each servo moves in the correct direction. If
either servo moves in the wrong direction, it will be necessary to reset that servo using the appropriate reversing function on your transmitter.
2.Travel Adjust.
Switch the transmitter and receiver on, then move the rudder and throttle sticks to their extremes and see if each servo moves to its full control position. If
either servo moves too far and binds up it will be necessary to reduce the ATV for that channel, likewise if it does not move far enough you will have to
increase it. For any given channel, the value in both directions should be equal. Do not exceed a maximum ATV difference of 10%. If the throttle ATV is
unbalanced by more than this amount, then the servo sub trim or the positions of the arms on throttle servo and/or on the carburator will have to be
repositioned. If the rudder ATV is unbalanced by more than 10% then the servo sub trim and/or tail pitch arm neutral setting should be re-checked and
any necessary adjustments made.
NOTE:
Try to get the mechanical set up as close possible to the values given in this manual and you will find that final trimming will be so much easier.
Using the transmitter to correct a poor mechanical set up will result in a model that is very difficult to trim and fly.
STEP 8-1 FINAL SERVO AND RADIO SETUP
3. Sub trim Function
When the rudder stick and trim are in their mid position make sure that the
servo horn and tail control rod are at 90º as shown next. If you cannot
achieve the desired servo arm position use the sub trim function to make
minor adjustments.
NOTE:
lt is necessary to keep the sub trim values as close to zero as
possible to make final setting up simple.
If you are not using a head locking gyro it will be necessary to adjust the
revolution mixing to compensate for the torque changes of the engine
during all flight conditions (except autorotation). We recommended that
the initial Revo mix values be set to approximately 10% for hovering and
5% for stunt/aerobatic flight. Since there are many variables that can alter
the values of the revolution mixing, it will be necessary to fine tune these
according to your flying style. If you are using a dual function gyro ie one
that can be switched between normal and head locking mode, then please
refer to your gyro's instructions for more information.
NOTE:
The Revo mixing values must be set for a helicopter with a
clockwise rotating head.
Correct ATV
Incorrect ATV
100%
100%
100%
50%
0%
0%
90º
90º
R1
