101
Program description - Base setup models | Helicopter models
BASIC SETTING,MODEL
STO SET
RF range test 99s
DSC Output PPM10
–––
Autorotation
Autorot. C1-Pos. -55%
–––
After this has been done, use the selection keys to
move into the column above the switch symbol then
assign a switch to this field, as described on page 60
in section "Switches, controls and control switches":
BASIC SETTING,MODEL
STO SET
RF range test 99s
DSC Output PPM10
–––
Autorotation
Autorot. C1-Pos. –55%
4I
Once this activation switch is closed, the first occur-
rence of a threshold underrun will cause the program
to switch over to "Autorotation" and then remain in-
dependent of C1 position in this flight phase until the
activating switch, in this example switch 4, is again
"OFF".
"Autorot. C1-Pos." has precedence over all other
flight-phase switches.
Corresponding parameter settings for …
• pitch servos
• throttle servo
• tail rotor servo
• swashplate rotation, if available
• gyro setting
… are made in the »Helicopter mixer« menu,
page 190.
Cut-off
Within the framework of autorotation settings for the
mc-32 HoTT transmitter's helicopter program,
there are parameters for an emergency "Thr. CutOff"
of the throttle servo or motor actuator, refer to the
programming proposal on page 334. However, this
option is not available if an idle position is specified
in the "Throttle position AR" line of the »Helicopter
mixer« menu instead of an (emergency) OFF posi-
tion; for example, to avoid restarting the motor after
every landing during autorotation practice.
This option not only replaces the"Cut-off trim" function
known from other Graupner mc and mx transmitters
but also serves as an Emergency-OFF function at the
same time, which was not possible with the"Cut-off
trim" function.
Depending on the "forw./rear" choice made for the
"Pitch min" line of the »Helicopter type« menu, this
"Thr. CutOff" option can be coupled to a switch for
throttling down a speed controller or a carburettor
servo to the motor OFF (or idle) position.
This cut-off (or idle) position is specified in the left
column's field, above the SEL column label, and its
value is to be established through trial and error.
A speed controller or throttle servo will only take on
this preset position when a certain servo position or
threshold is underrun and a switch is activated. This is
done by setting the desired servo position (threshold
value) into the middle column field, directly over the
column label STO, then selecting the appropriate ON/
OFF switch function in the right column.
• If the percentage value specified for the middle
column is greater than the current servo posi-
tion, i. e. the current servo position lies below the
threshold, the switchover will occur as soon as the
switch is put into its ON position.
• If the percentage value specified for the middle
column is less than the current servo position, i. e.
the current servo position is above the threshold,
the speed controller will initially reduce motor
speed or close the carburettor's throttle servo only
to the extent dictated by the value in the left col-
umn as soon as the servo's position once under-
runs the threshold (max. +150 %) after the switch
is changed over to its ON position.
The speed controller or throttle servo will remain
in this cut-off position only until the selected
switch is again changed over followed by a one-
time throttle servo or speed controller movement
beyond the preset threshold with the throttle/brake
stick control.
The factory setting for the left column is -100 % for
the throttle servo "cut-off" position and a threshold of
+150 % servo position setting in the middle column.
BASIC SETTING,MODEL
SET SET
DSC Output PPM10
–––
Autorotation
Autorot. C1-Pos.
0%
–––
SEL
STO
–––
Thr. CutOff +150%–100%
Programming procedure
To change the throttle servo's preset "cut-off" posi-
tion, tap on the centre SET key of the right touch pad.
The current setting will be displayed in inverse video.
Now use the selection keys of the left or right touch
pad to set a value at which the motor is reliably "off"
without a startup of the throttle servo. For example
-125 %:
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