GRAUPNER mc-32

197
Program description - Helicopter mixer
This mixer sets the extent to which the throttle follows
the tail rotor. The throttle will follow on one side only,
to the side on which the tail rotor thrust is increased.
The setting range is therefore 0 to +100 %. The direc-
tion depends on the main rotor's direction of rotation
(left or right), and this must first be set correctly on
the »Helicopter type« menu, page 109. For left-hand
rotation systems, the throttle follows the tail rotor
when the tail rotor stick is moved to the left, and vice
versa for right-hand rotation systems.
A simultaneous tap on the  or  keys of the
right touch pad (CLEAR) will reset a changed value
in an active (inverse video) field back to 0 %.
In the auto-rotation ight phase this mixer
is automatically switched off.
Set-up notes:
To set the mixer value accurately you should
either rst y several high-speed pirouettes
against the direction of main rotor rotation or, if
a strong wind is blowing, hover at right angles to the
wind with a sufciently large tail rotor deection. Set
the mixer value so that there is no fall-off in system
rotational speed.
trim wheel.
For a reliable torque compensation setting, it is es-
sential that the collective pitch and throttle curves
have been set up correctly, i. e. that the rotor speed
remains constant over the collective pitch's full adjust-
ment range.
This third curve mixer applies only to the control
curve of the tail rotor servo when the throttle/col-
lective pitch stick is moved, whereas the "Channel
1 curve" (see page 143) acts on all servos that are
affected by the throttle/collective pitch stick. Note that
the output signal of the "Channel 1 curve" option also
functions as an input signal for the tail rotor curve
programmed here: In the graph, the vertical line is
synchronized with the throttle/collective pitch stick
and follows the current Channel 1 curve characteristic
from the »Channel 1 curve« menu.
In the auto-rotation ight phase this mixer
is automatically switched off.
Tail rotor  throttle
Channel 1
Channel 1
Pitch
Throttle
Tail rot.
Tail rot.
0%
Roll
0%
Throttle
Throttle
SEL
Normal
While the tail rotor normally compensates for the
effect of main rotor torque on the fuselage, it is also
used to control the helicopter around the vertical axis.
Increasing tail rotor thrust requires a corresponding
adjustment to motor power, however, to avoid a fall-off
in system rotational speed.
Roll  Throttle and Pitch axis  Throttle
Channel 1
Tail rot.
Tail rot.
0%
Roll
0%
Throttle
Throttle
SEL
Roll
Tail rot.
Nick
Throttle
0%
0%
Normal
Increasing collective pitch is not the only change that
requires the throttle to follow suit: major cyclic control
movements also require this, i. e. if the swashplate is
tilted in any direction. The
mc-32 HoTT program
lets you adjust the degree of throttle follow separately
for roll and pitch-axis controls.
This offers particular advantages in aerobatic flying,
e. g. when flying a roll: here, with moderate collective
pitch values and the carburettor only about half-open,
cyclic control travels are nonetheless executed that
require much higher performance from the motor.
The mixer value can be varied within the range 0 to
+100 %. The correct mixer direction is automatically
taken into account.
A simultaneous tap on the  or  keys of the
right touch pad (CLEAR) will reset a changed value
in an active (inverse video) field back to 0 %.
In the auto-rotation ight phase this mixer
is automatically switched off.