User manual

193Program description - Helicopter mixer
2
+50%
+50%
+50%
normal
Throttle limiter position
Input
Output
Point
C1 Thro
Curve
off
The output signal for the throttle servo can never
be higher than that set by the horizontal bar. In this
example, about a maximum of +25 %.
• Since electric drive systems have no need for an
idle setting, the basic configuration of settings for
an electrically-powered helicopter merely involves
making sure that the control range of the throt-
tle limiter is both higher and lower than the adjust-
ment range of the speed controller (usually -100 %
to +100 %) by a safe margin. If necessary, there-
fore, adjust the “travel” setting of the throttle limit-
er as appropriate on the “Lim.” line of the »Control
adjust« menu. Leave the default value of “GL” in
the “Type” column alone, however, to configure this
setting globally for all flight phases.
Fine-tuning of the throttle curve itself, however,
must take place in flight – as with a glow-powered
helicopter.
• If you wish to record the flight time of a (glow-pow-
ered) 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 145.
For auto-rotation flight, an automatic switch-over
is made from this mixer to a configurable default
value; see page 202.
Helicopter with speed REGULATOR
Unlike speed controllers, which merely adjust output
level in a manner similar to a carburetor, 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 connect-
ing a speed regulator; refer to the receiver layout on
page 75. However, if this connection is used there
will be no throttle limit function because the throttle
limit function can only be implemented via the “C1 
Thro” 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 con-
nected to receiver output 6 (contrary to the general
connection notices) and only requires appropriate
adaptation to the throttle curve so it can take over the
task of the “conventional” transmitter control.
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
“C1  Thro” 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 de-
fined by the target motor speed.
First, therefore, the reference points “1” to “4” – if
present and set – are erased. Following this, the refer-
ence points “L” (input = 0 %) and “H” (input = +100 %)
are then each set to the same value, for example:
0%
+65%
+65%
C1 Thro
normal
L
Input
Output
Point
Curve
off
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 202.
C1  Tail (Static torque compensation)
0%
0%
0%
Tail
C1
normal
?
Input
Output
Point
Curve
off
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 helicop-
ter 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 189), the control curve of the tail rotor
can also be defined by up to 6 points. If required,