GRAUPNER MC-20 HoTT Programming Manual page 89

When this technique is evaluated during
competitions, the motor must be switched off for
autorotation. On the other hand, for training mode
it is advantageous to keep the motor at idle for
autorotation.
The Autorotation switch causes a switchover to the
autorotation fl ight phase in which control of "throttle"
and "pitch" are separate and all mixers which have
an effect on the throttle servo are switched off.
Corresponding parameter settings are made in the
»Helicopter mixer« (see text beginning page 176);
refer also to the "Principle of the Auto. C1 Pos." topic
which follows.
The "Autorotation" name is permanently assigned to
phase 1 and it is included in the base screen of all
fl ight phase dependent menus. This name can NOT be
changed. It is only possible to assign a switch to this
option at the right of this display, as described on page
56. If a switch is assigned, it will have absolute
priority over all other fl ight-phase switches.
B A S I C S E T T I N G , M O D E L
RF transmit
RF range test
DSC Output
Autorotation
SET
More about fl ight-phase programming can be found
in the text beginning on page 176 in the»Helicopter
mixer« section.
Autorotation C1 position
The autorotation fl ight-phase can alternatively be
activated by a threshold point for the C1 throttle/pitch
joystick. To do this, use the selection keys of the left
or right touch pad to move into the "Autorot. C1-Pos."
line.
As soon as this display line has been selected, its
value fi eld, located above the column label STO will
be framed.
B A S I C
RF range test
DSC Output
Autorotation
Autorot. C1-Pos.
Move the C1 joystick into the desired threshold
switchover position then tap the center
right touch pad. The current value will be displayed,
e.g.:
B A S I C
RF range test
DSC Output
Autorotation
Autorot. C1-Pos.
on
After this has been done, use the selection keys to
99s
move into the column above the switch symbol then
PPM10
assign a switch to this fi eld, as described on page 56
–––
in section "Switches, controls and control switches".
SET
Preferably one of the two self-restoring switches
B A S I C
RF range test
DSC Output
Autorotation
Autorot. C1-Pos.
Once this activation switch is closed, the fi rst
occurrence of a threshold underrun will cause the
program to switch over to "Autorotation" and then
S E T T I N G , M O D E L
99s
PPM10
–––
0% –––
STO SET
SET key of the
S E T T I N G , M O D E L
99s
PPM10
–––
-55% –––
STO SET
S E T T I N G , M O D E L
99s
PPM10
–––
–55% 4I
STO SET
Detail program description - Base setup models | Winged models
remain independent of C1 position in this fl ight phase
until the activating switch, in this example switch 4, is
again "OFF".
"Autorot. C1-Pos." has precedence over all other
fl ight-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 176.
Cut-off
Within the framework of autorotation settings for
mc-20
the 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 314. However, this
option is not available if an idle position is specifi ed
in the "Throttle position AR" line of the »Helicopter
mixer« menu instead of an (emergency) OFF
position; 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 carburetor
servo to the motor OFF (or idle) position.
This cut-off (or idle) position is specifi ed in the left
column's fi eld, above the SEL column label, and its
value is to be established through trial and error.
89