111
Program description: Mixers
Further typical applications:
• Model with two airbrakes:
Dual mixer 1: „
C1
“ and „
8
“, diff.= 0%.
A second servo connected to output 8 moves in
parallel with the fi rst airbrake when the airbrake
stick is operated. The trim acts on both servos. For
safety’s sake you should set output 8 to “free” in
the »Control adjust« menu.
• Model with two rudders and differential travel (e.g.
sweptback fl ying wing):
Dual mixer 1: „
8
“ and „
RU
“, diff.= -75%.
When the rudder control is operated, the second
servo connected to output 8 follows the fi rst ser-
vo (with this programming it is possible to set diffe-
rential travel for the rudders). The rudder trim acts
on both rudders. If you want both rudders to defl ect
outward when you extend the airbrakes, assign
one of the available sliders to input 8 in the »Con-
trol adjust« menu. You may then have to “experi-
ment” a little with the offset and travel settings to
obtain the results you want.
• V-tail with differential rudder travel:
In the »Model type« menu you must enter the tail
type as “normal” for this application.
Dual mixer 1: „
EL
“ und „
RU
“, diff.= (e.g.)
-75%
Depending on the way the transmitter controls are
moved, both servos operate either as elevators or
rudders. The differential is only effective when a
rudder command is given, in accordance with the
channel assignment of the dual mixer. In this case
both trim levers are effective. An additional free mi-
xer is not required for this arrangement.
S E L
S W A S H M I X E R
P i t c h
+ 6 1 %
R o l l + 6 1 %
P i t c h a x . + 6 1 %
t
In the »Helicopter type« menu you have defi ned the
number of servos which are installed in your helicop-
ter for collective pitch control; see page 53. With this
information the mc-22s program automatically coup-
les together the functions for roll, pitch-axis and col-
lective pitch as required, so that you do not need to
defi ne any additional mixers yourself.
If you have a model helicopter which only has a sing-
le collective pitch servo, this menu point is – of course
– superfl uous, since the three swashplate servos for
collective pitch, pitch-axis and roll are controlled inde-
pendently of each other. In this case the swashplate
mixer menu does not appear in the multi-function list.
With all other swashplate linkages employing 2 ... 4
collective pitch servos, the mixer ratios and directions
are set up by default, as can be seen in the screen
shot above. The pre-set value is 61% in each case,
but the value can be varied within the range -100%
to +100% if required, after a brief press on the rota-
ry control.
(CLEAR = +61%.)
If the swashplate control system (collective pitch,
roll and pitch-axis) does not respond to the transmit-
ter sticks in the way you require, then the fi rst step
is to change the mixer directions (+ or –), before you
attempt to correct the directions of servo rotation.
HEIM mechanics with two collective pitch servos:
• The collective pitch mixer acts on the two collecti-
ve pitch servos connected to receiver sockets 1 +
2;
• the roll mixer also acts on the two collective pitch
Swashplate mixers
Collective pitch, roll and pitch-axis mixers
servos, but the direction of rotation of one servo is
reversed;
• the pitch-axis mixer acts on the pitch-axis servo
alone.
Note:
Ensure that the servos do not strike their mechanical
end-stops if you change the servo mixer values.
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