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If you wish to record the flight time of a (glow-
powered) helicopter, you can assign a control
switch to the throttle limit slider, and then use this
to switch a timer on and off; see page 146.
For auto-rotation flight, an automatic
switch-over is made from this mixer to a
configurable default value; see page 206.
Helicopter with speed GOVERNOR
Unlike speed controllers, which merely adjust output
level in a manner similar to a carburettor, a speed
regulator keeps speed in the system it monitors con-
stant by regulating its output autonomously. In the
case of combustion motor powered helicopters, the
regulator therefore controls the throttle servo itself
as appropriate or, for an electric helicopter, the mo-
tor's speed controller. Therefore, speed regulators do
not need a traditional throttle curve but rather only a
speed setting. A deviation from the preset speed will
therefore only take place if the level of output required
exceeds the maximum level available.
Usually, receiver output 8 is reserved for connecting
a speed regulator; refer to the receiver layout on page
65. However, if this connection is used there will be no
throttle limit function because the throttle limit function
can only be implemented via the "Channel 1 Throt-
tle" mixer which is on the – then unused – output 6.
To make the comfort and safety features of a throttle
limiter available, a speed regulator should be connect-
ed to receiver output 6 (contrary to the general con-
nection notices) and only requires appropriate adapta-
tion to the throttle curve so it can take over the task of
the "conventional" transmitter control.
196 Program description - Helicopter mixer
Since in this case the "throttle curve" only regulates
the target speed of the motor controller and this
target motor speed should typically remain constant
over the entire collective pitch adjustment range, the
"Channel 1 Throttle" mixer must be used to set a
horizontal line – i. e. every (pitch) input value will result
in the same ("throttle") output value – whose "height"
is defined by the target motor speed.
First, therefore, the reference points "1" to "6" – if
present and set – are erased. Following this, the refer-
ence points "L" (input = -100 %) and "H"
(input = +100 %) are then each set to the same
value, for example:
Channel 1
Throttle
Input
0%
Curve
Output
+66%
off
Point
L
+66%
Normal
The value to be set depends both on the speed con-
troller used and on the target motor speed that is
desired, and can, of course, be varied according to
the flight phase.
For auto-rotation flight, an automatic
switch-over is made from this mixer to a
configurable default value; see page 206.
Channel 1 Tail rot.
(Static torque compensation)
Channel 1
Tail rot.
Input
0%
Curve
Output
0%
off
Point
?
0%
Normal
The default approach here is to preset a torque com-
pensation curve with a linear mixer ratio of a uniform
0 %, as is required for a gyro sensor working in "head-
ing lock mode" – see the screen image above.
Important notice:
In this context, ensure that you
comply with the instructions on
adjusting your gyro: if not, you risk
making adjustments that render your
helicopter impossible to fly.
If, on the other hand, you use your gyro sensor in
the "normal" operating mode, or if it only has what is
termed "normal mode", then configure the mixer as
follows:
As with the configuration of the collective pitch curve
(see page 191), the control curve of the tail rotor can
also be defined by up to 8 points. If required, there-
fore, you can modify the mixer at any time and preset
both symmetrical and asymmetric mixer ratios both
–
+
above and below the hover point. Before you do, how-
ever, ensure you have entered the correct direction of
rotation for the main rotor on the »Helicopter type«
menu, page 109.
Channel 1
Input
Curve
Output
off
Point
Normal
Starting with values of -30 % for point "L" and +30 %
for point "H", the mixer is to be configured in such a
way that the helicopter, even during prolonged verti-
cally ascending or descending flights, does not devi-
ate from the yaw axis as a result of the main rotor's
–
+
altered torque while hovering. For hovered flight, trim
should only be affected by way of the (digital) tail rotor
Tail rot.
+100%
+30%
H
+30%
–
+
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