42
For each flight mode setting, there will be different
Revo-mixing amounts. For forward flight the
settings will be lower than hovering due to the
aerodynamic forces effecting the helicopter. Here is
a starting point for revo values:
Tail Rotor Setup (rate gyro)
Problem: Not enough
pitch in tail rotor to
match torque setting
of engine.
Action: Increase pitch
by lengthening
2
the
rudder pushrod.
1
Nose rotates
left at hover.
Pilot
2
Nose rotates
right at
hover.
Problem: Too much
pitch in tail rotor to
match torque setting
of engine.
Action: Decrease
pitch by shortening
2
the rudder pushrod.
What separates airplane radio equipment from the
helicopter version is in the control of the individual
curves discussed earlier and in the Revo-mixing
1
.
Take a moment to consider the helicopter
hovering
in front of you.
Once the tail rudder pushrod is adjusted correctly
so the tail does not rotate ( don't consider wind now
) the revolution mixing can be adjusted.
Note 1:
The revolution mixing function allows the helicop-
ter to climb or descend without the tail rotating.
These setting are set when using regular piezo rate
gyros, if using a Heading Hold gyro remove all tail
mixing. There is a high & low setting on the heli-
copter radio. The values shown will vary depend-
ing on engine, blade pitch and fuel but provide a
starting point for the beginner.
These values correspond to the total travel for the
tail rotor pitch. To adjust the high setting, hold the
helicopter at hover and increase the throttle so the
helicopter climbs steadily. Notice the direction the
nose rotates:
High Stick Setting: 40
Low Stick Setting: 20
Normal Flight
Mode
left
increase revo value to
increase tail pitch.
right
decrease revo value to
decrease tail pitch.
Nose rotates
High
&
Low
To adjust the low setting, start from a high hover
and decrease the throttle to descend, notice which
direction the helicopter rotates.
Gyro Gain Adjustment
The gyro assists in holding the tail rotor, actually
compensating for changes in wind direction or
quick movements.
First check that the gyro is installed cor-
rectly by watching the rudder servo. While hold-
ing the rotor head move the rudder stick to the
right and observe the direction the servo arm
moves. Now quickly rotate the nose to the left, the
servo horn should move in the same direction. If
the rudder servo horn moves in the opposite direc-
tion reverse the gyro direction.
Generally the starting setting for the gyro gain is
60%, keep increasing the gain setting until the tail
starts oscillating back and forth, then reduce the
setting slightly.
Problem: Tail rotor makes sudden uncontrolled
rotations.
Solution: The gyro direction is possibly set in the
wrong direction.
Pilot
Note 2: The tail rotor is mounted on the left side of the
helicopter, this is opposite to all our regular models.
