User's Instructions

Helicopter
(HELI)
Section
– –
86
14. Servo Travel. Use the
EPA
command to
limit servo travels to prevent binding.
EPA 100
CH
421 3 567
L/U
%
15. Collective Pitch. The collective pitch
angle (controlled by CH6 on a conventional
helicopter) should vary from -2° to +10° with
full stick motion, depending on the flight
condition. We recommend setting the hovering
pitch (pitch with throttle stick at center) to
+4.5°. Adjust servo arms and EPA values to
get the desired travel at the end points,
measuring with a pitch meter.
16. Engine travel. On the regular display
menu, enter a value of –25% for throttle trim.
Use the EPA menu to set up the carburetor
pushrod so that at full throttle there is no
binding, and so the engine idles smoothly at
low throttle.
17. Throttle Cut. Enter the throttle cut
(T.CUT) menu and enter a value of –25% or
so. Press the Cut button and be sure that the
carburetor fully closes, which will shut off the
engine. Don’t pick too large a number, or
binding may occur.
T.CUT - 59
%
3
18. Throttle Curve. You can use the
Throttle Curve (THCV) menu's five-point
setting curves to fine-tune the engine servo's
response. Adjust the throttle position for hover
to get the desired head RPM. You can change
the curve values to make a steeper curve near
idle and shallower curve past hover. See the
THCV menu description on page 91 for more
details.
THCV 0
%
ST1
42135
ST2 NOR
If your instructions don’t give any
suggested values, you may start with the
following settings:
Throttle Curve NOR
Point 1 (low) 2 3 4 5 (high)
% 0 26 45 72 100
19. Pitch Curve. You can use the Pitch
Curve (PTCV) menu's five-point setting
curves to make finer adjustments to the
endpoints and the middle of travel of the pitch
servo.
PTCV 0
%
ST1
42135
ST2 NOR
Your model’s instructions may provide
suggested values for the blade pitch angles. If
not, you may want to start with the following:
Pitch Curve NOR
Point 1 (low) 2 3 4 5 (high)
Pitch 0 deg. +5 +6.5 +8.0 +10.0
Backer you’ve set the pitch at each of the five
points, be sure to check that both aileron and
elevator motions do not cause binding at
extreme pitch settings. If they do, use
EPA
to
reduce travels.
20. Revolution mixing (
RVMX
) uses the tail
rotor to suppress the torque reaction of the
main rotor due to changes in collective pitch.
It is disabled whenever Idle-Up or Throttle
Hold are activated.
RVMX
may be set on either side of the stick
(note the letters
R/D
and
L/U
displayed).
Adjust
RVMX
mixing for both travel directions
as described in the trimming instructions on
page 97.