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Helicopter models
  Helicopter models
The advanced developments incorporated into the 
transmitter as well as those now in helicopter models 
and their components like gyros, speed regulators, 
rotor blades, etc. make it possible to master a 
helicopter even in 3D acrobatic fl ight. On the other 
hand, a beginner needs only a few settings to get 
started with hovered fl ight training then, step-by-
step, take advantage of 
mc-20
 HoTT features with 
increasing expertise.
The
mc-20
 HoTT program can operate all 
conventional helicopters having 1 … 4 servos for 
pitch control.
Seven fl ight phases plus autorotation are available 
within a model memory, see menus »Control adjust«, 
»Phase settings« and »Phase assignment«.
As with winged aircraft, here too, in addition to the 
basic screen's standard timers there are additional 
timers as well as a lap counter with fl ight-phase-
dependent stopwatch functionality which are available 
for selection (menus »Timers (general)« and »Fl. 
phase timers
«).
Except for pitch/throttle trimming, digital trimming can 
be stored as "global" for all fl ight phases or as "fl ight 
phase specifi c". C1 trim permits easy location of an 
idle setting.
The control assignments for inputs 5 … 16 is made 
separately for each fl ight phase (»Control adjust«
menu).
A fl ight phase copy function is helpful during fl ight 
trials (»Copy / Erase« menu).
"Dual Rate" and "Exponential" functions can be 
coupled for roll, nick and tail rotor and programmable 
in two variations in every fl ight phase.
There are 8 freely assignable linear mixers. There 
are also 4 curve mixers that can be programed and 
these can also be switched on or off, depending on 
the fl ight phase, in the »MIX active/phase« menu. 
Beyond this, there are also 4 dual mixers available.
The »Helicopter mixer« menu provides fl ight-
phase-dependent 8-point curves for the non-linear 
characteristics pitch, throttle and tail rotor mixer as 
well as two independent swashplate mixers each for 
roll and nick. Independent of this, the control curve 
of the channel 1 joystick can be defi ned with up to a 
total of 8 points in every fl ight phase. The beginner 
will initially only adapt the hover fl ight point to the 
control middle for the non-linear characteristics. 
Pre-programmed mixers in the »Helicopter mixer« 
menu
:
Pitch curve (8-point curve)
1. 
C1
2. 
¼ throttle (8-point curve)
Channel 1 
3. 
¼ tail rotor (8-point curve)
Tail rotor 
4. 
¼ throttle
Roll
5. 
¼ throttle
Roll
6. 
¼ tail rotor
Pitch-axis
7. 
¼ throttle
Pitch-axis
8. 
¼ tail rotor
Gyro suppression
9. 
Swashplate rotation
10. 
Swashplate limiter
11. 
The "Throttle limit" function (input Tl16 in the 
»Control adjust« menu) allows the motor to be 
started in any fl ight phase. The right-side proportional 
rotary slider is assigned to input "Tl16" by default. 
This "throttle limiter" establishes – depending on its 
given position – the maximum possible throttle servo 
position. This makes it possible for the motor to be 
controlled in the idle range, if necessary even by the 
proportional regulator. The throttle curves become 
effective only when the proportional regulator is 
pushed toward the full throttle direction.
Collective 
Pitch Curve
Swashplate 
Rotation
Roll
 Throttle
Pitch-Axis   Throttle
Channel 1   Throttle
Roll
 Tail Rotor
Pitch-Axis   Tail Rotor
Channel 1   Tail Rotor
Channe
l 1
Tail Rotor
Tail Rotor
Throttle