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per fl ight phase) by up to 8 points, termed "reference
points", placed at any point along the joystick travel.
The reference points are defi ned, adjusted and
erased in the usual way, as explained in the previous
section on the collective pitch curve. Start by defi ning
the throttle curve with three points, namely the points
"L" and "H" at the extremes, plus the Point "1" still
to be set in the control center in order to match the
motor power curve to the collective pitch curve.
180 Detail program description - Helicopter mixer
Helicopter with carburetor or electric drive
system with speed CONTROLLER
This setting relates only to the control curve of the
throttle servo or the speed controller.
Setting the throttle curve to suit a helicopter equipped
with a speed controller is discussed in the following
section.
As with the confi guration of the collective pitch curve
(see previous page), the throttle curve can also be
defi ned by up to 8 points.
•
In each case, set the control curve so that
when the throttle/collective pitch stick is in its
end position, the carburetor is fully open or the
controller of an electrically-powered helicopter is
set to maximum (except for auto-rotation fl ight,
see page 190).
•
For the hover point, which is normally at the
control center, the carburetor setting or power
control for the speed controller must be matched
to the collective pitch curve so that the correct
system rotational speed is obtained.
•
At the minimum position of the throttle/collective
pitch stick, the throttle curve must fi rst be
confi gured so that a glow motor runs at a speed
considerably higher than idle speed and the clutch
is fi rmly engaged.
Starting and stopping of the motor – whether
combustion or electric drive – always takes place
within the given fl ight phase as a consequence
of the throttle limiter and the "Thr. CutOff" option
(see below).
This makes it unnecessary to program the two fl ight
phases that may be familiar to you from using other
remote control systems – namely "with idle-up" and
"without idle-up", and with the associated "waste" of a
fl ight phase for this purpose – since the
program offers a much more fl exible approach to fi ne-
tuning and optimizing increases to system rotational
speed below the hover point than the "idle-up"
approach taken by older mc remote control systems.
Ensure that the throttle limiter is closed before
starting a motor with carburetor, i.e. so that the
carburetor can be adjusted within the idle range
only with trim. Ensure that you follow the safety
instructions on page 189 at all times. If the throttle is
set too high when switching on the transmitter, you
will receive audible and visible warnings!
Starlet
#02
0:00h
H-J Sandbrunner
00:00h
4.1V
0
The following three graphs show (typical) 3-point
throttle curves for various fl ight phases, such as
hovering aerobatics and 3D fl ight.
Sample throttle curves for various fl ight phases:
+100%
-100%
1
2
3
4
5
Control travel
Hover
Notes on using the "throttle limit" function:
•
The throttle limit function should be used in any
case (»Control adjust« menu, page 117). At the
rear limit of the default transmitter control, the
right-side throttle limit proportional rotary slider,
the throttle servo is completely decoupled from the
throttle curve, the motor is at idle and will respond
mc-20
HoTT
only to C1 trim. This option permits the motor
to be started in any fl ight phase and to shut the
motor off with the "Thr. CutOff" option.
0:00.0
Stoppuhr
Thr
0:00.0
Flugzeit
too
high!
K78
Normal
V
M
0
0
0
+100%
+100%
-100%
-100%
1
2
3
4
5
1
2
3
4
5
Control travel
Control travel
Aerobatics
3D
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