Collective
Pitch Curve
Swashplate
Rotation
Roll
Throttle
Pitch-Axis
Throttle
Channel 1
Throttle
Roll
Tail Rotor
Pitch-Axis
Tail Rotor
Channel 1
Tail Rotor
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The advanced developments incorporated into the
transmitter as well as those now in helicopter models
and their components like gyros, speed regulators, ro-
tor blades, etc. make it possible to master a helicopter
even in 3D acrobatic flight. On the other hand, a begin-
ner needs only a few settings to get started with hov-
ered flight training then, step-by-step, take advantage
of HoTT transmitter features with increasing expertise.
All current model helicopters with one to four collec-
tive pitch servos can be operated using the programs
provided by the
mc-16 HoTT and mc-20 HoTT.
Six flight 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 ba-
sic screen’s standard timers there are additional timers
as well as a lap counter with flight-phase-dependent
stopwatch functionality which are available for selection
(menus »Timers (general)« and »Fl. phase timers«).
Depending on the transmitter, it is possible to store
the digital trims in “flight phase specific” or “global”
form – for all flight phases; this does not apply to collec-
tive pitch / throttle trim. C1 trim permits easy location of
an idle setting.
The control assignments for inputs 5 … 8 respec-
tively 5 … 12 is made separately for each flight phase
(»Control adjust« menu).
A flight phase copy function is helpful during flight trials
(»Copy / Erase« menu).
“Dual Rate” and “Exponential” functions can be cou-
pled for roll, nick and tail rotor and programmable in
two variations in every flight 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 flight
phase, in the »MIX active/phase« menu. Four dual
mixers are also available (»Dual mixers« menu, pro-
vided as standard on the
mc-20 HoTT transmitter
only).
The »Helicopter mixer« menu provides flight-phase-
dependent 6-point curves for the non-linear character-
istics 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 stick can be defined with up to a total of 6 points in
every flight phase. The beginner will initially only adapt
the hover flight point to the control middle for the non-
linear characteristics.
Pre-programmed mixers in the »Helicopter mixer«
menu:
1. Pitch curve (6-point curve)
2. C1 throttle (6-point curve)
3. Channel 1 tail rotor (6-point curve)
4. Tail rotor throttle
5. Roll throttle
6. Roll tail rotor
7. Pitch-axis throttle
8. Pitch-axis tail rotor
9. Gyro suppression
10. Swashplate rotation
11. Swashplate limiter
The “Throttle limit” function (input “Lim.” in the »Con-
trol adjust« menu) allows the motor to be started
in any flight phase. From firmware version 1103 is
the input “Lim.” however, by default no longer preset
and thus disables the throttle limiter, but it can be
re-activated at any time by assigning an encoder. 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.
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