50
Now that the radio system is completely installed into the
helicopter, it is necessary to check and adjust the following:
1. Servo Direction (Servo Reversing)
Check to insure that all servos have been set to the correct
direction as shown in Steps 7-1 to 7-5.
2. Dual Rates
It is suggested that for initial flights the Dual Rate function values
be set as follows:
0 Position (low rate): 60%
1 Position (high rate): 100%
3. Exponential Settings
It is suggested that the exponential rate settings remain in the
0 value position until the initial test flights. After initial flights,
adjust the exponential values to achieve the desired control feel.
4. Sub-Trim Settings
It is suggested that the correct neutral settings be achieved
without the use of the sub-trim feature. If sub-trim is used for final
flight adjustments, it is suggested that the sub-trim values not
exceed 10. If the sub-trim values are greater, readjust the control
linkages and reset the sub-trims to 0.
5. Pitch/Throttle Curve Adjustment
It is very important that the throttle and pitch curves are adjusted
properly to achieve the best performance from your helicopter.
When properly adjusted, the main rotor head rpm should remain
consistent throughout all maneuvers and throttle stick positions. A
constant rpm will also help to improve the effectiveness and
accuracy of the tail rotor and gyro systems.
A) Pitch Curve Adjustment
It will now be necessary to adjust the main rotor blade pitch
to match the settings shown in the chart below. A main rotor
blade pitch gauge (sold separately) will be necessary for this
procedure. Prior to setting the main rotor blade pitch, set the
required blade pitch at 1/2 (center) stick. Turn the system on
and set the collective pitch stick to the center position as in
previous steps. If all linkages are properly adjusted, the
swashplate/rotor head system should appear as shown in the
diagram below. Please note that at the center pitch position,
the seesaw mixing arms located on the rotor head are parallel
(level) to the seesaw shaft/flybar assembly.
If your seesaw mixing arms are not level as shown, adjust the
two seesaw arm to swashplate control rods as needed.
Pitch Adjustment: Once the position of the seesaw mixing
arms have been established, attach a main rotor pitch gauge
(sold separately) to one rotor blade and check the current
pitch setting. The current pitch should be approxi5.
If the pitch is slightly less or more, this can be adjusted later
through the radio’s Pitch Curve function. Attach the pitch
gauge to the second main rotor blade and match the pitch at
this time.
FINAL SERVO ADJUSTMENT AND RADIO SETUP
Flight Application
Low Pitch Hovering Pitch High Pitch
Mode
(Low Stick)
(Half Stick)
(High Stick)
N
Hovering
-2°
5°
10°
I
Forward Flight
-5°
5°
8.5°
H
AutoRotation
-5°
5°
13°
Pitch Range Settings
+13°
5°
-5°
13°
8.5°
-5°
5°
13°
10°
5°
-5°
-5°
-2°
Hovering (Linear Curve)
Flight Mode
N
Flight Mode
1
Flight Mode
H
Stick Position
Stick Position
Low
Half
High
Low
Half
High
Stick Position
Low
Half
High
Forward Flight
Autorotation
Pitch Curve Settings
Pitch Range
Pitch Range
Pitch Range
Seesaw mixing arms
must be parallel to
seesaw shaft.
Seesaw Mixing Arm
to Main Blade Holder
Control Rod
Adjust as needed to level seesaw
mixing arms.
View from front of model
JRP9012.46 Robinson R22 Manual 10/6/00 5:06 PM Page 50
