HITEC OPTIC 6 - Page 48

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Helicopter Setup Instructions
16. Collective Pitch . The blade collective pitch angle
(controlled
by CH6 on a conventional helicopter) should
vary
from -2 ° to +10 ° with full stick motion, in the " NOR "
or hovering Flt Mode . 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.
17. Engine Servo 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.
18. 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.
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
A
fter 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.
21. 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, ST2,
ST3 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 56.
19. 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
52 for more details.
If your instructions don't give any suggested values,
you
may start with the following settings:
22. Gyro settings. You can select an independent value of gyro
gain for each flight condition by using the GYRO menu. Press
one
of the Cursor keys to activate the Gyro gain
Function.Select
the desired flight condition, with the FLT
Mode
SW-4 or SW-1 Switch. Then use the Data keys to
choose
the desired value. The gyro must be plugged into
CH5 . You cannot independently control this channel.
It is for gyro gain control functions only. See page 51 for
more
information on the Gyro gain set-up.
Throttle Curve NOR
Point 1 (low) 2 3 4 5 (high)
%
0 26 45 72 100
20. 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.
23. Aerobatic Setups and Flight Conditions . Your Optic
system
has three built-in flight condition menus in addition
to
the normal ( NOR ) hovering mode. Two -- ST1 and ST2
-- are typically used for aerobatics, including 540 ° stall turns
,
looping, and rolling stall turns. ST3 is used for "throttle hold
"
so that the throttle servo is disengaged during autorotations
.
These functions are switched on as follows:
- NOR : ON when FLT MODE Switch is forward.
- ST1 : ON , when FLT MODE Switch is centered
Helico
p
ter Setu
p
Instructions
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