GRAUPNER mc-32

128
Program description - Control adjust | Helicopter models
started or stopped cleanly without some other means
of intervention.
The "throttle limit" feature resolves this problem el-
egantly by using a separate transmitter control – by
default the Lv1 proportional slider mounted on the
right side of the transmitter – to limit the throttle servo
or the output level of a speed controller. In this way,
it is possible to "throttle back" with the throttle limit
control, even as far as the idle setting, at which point
the trim control for the throttle/pitch stick takes over
or directly shuts off an electric drive. Conversely, the
throttle servo or speed controller can only open up to
its full-throttle position if the throttle limit control has
also released the full servo travel path.
The value set on the (right-hand) plus side of the "travel"
column must therefore always be set high enough to en-
sure that the maximum setting of the throttle limit control
never restricts the full-throttle position achievable with
throttle curve settings – which typically means setting a
value in the range +100 % to 125 %.
0%
I13 +100%
I14
I15
Tl16
TYP
+100%
– travel + –time+
0%
+100%
+100%
0.0 0.0
0%
+100%
+100% 0.0 0.0
0%
+125%
+100%
0.0 0.0
GL
GL
GL
fr
fr
Lv1
---
---
---
Offset
GL
Normal
0.0 0.0
fr ---
SET
The value on the (left-hand) minus side of the "travel"
column should be set so that the throttle limit control
can safely cut off an electric drive or close a carburet-
tor sufficiently to cut off a combustion motor in con-
junction with – digital – C1 trim.
Firmware version V1103 and higher
From this firmware version if the input is “Lim.” after
initializing a new model memory with the model type
“Helicopter” is by default “free”:
0%
I13 +100%
I14
I15
Tl16
TYP
+100%
– travel + –time+
0%
+100%
+100%
0.0 0.0
0%
+100%
+100% 0.0 0.0
0%
+100%
+100%
0.0 0.0
GL
GL
GL
fr
fr
fr
---
---
---
Offset
GL
Normal
0.0 0.0
fr ---
SET
However, by assigning a switch, for example, the
above default assigned right side proportional slider
SD2 described below option “Throttle limit” can be
reactivated at any time and adjusted as described
below.
ATTENTION:
The throttle limiter only remains disabled as
long as the input “Lim” is free! Otherwise this
input cannot be used.
Firmware version V1102 and lower
"Tl16"
The proportional slider Lv1, mounted on the right
side of the transmitter, is assigned by default to input
"Tl16".
0%
I13 +100%
I14
I15
Tl16
TYP
+100%
– travel + –time+
0%
+100%
+100%
0.0 0.0
0%
+100%
+100% 0.0 0.0
0%
+100%
+100%
0.0 0.0
GL
GL
GL
fr
fr
Lv1
---
---
---
Offset
GL
Normal
0.0 0.0
fr ---
SET
Throttle limit function
This pre-assignment makes it unnecessary to pro-
gram the two flight phases as may be familiar from
use of other remote control systems – one "with idle-
up" and one "without idle-up" – because the mc-32
HoTT program offers a much more flexible approach
to fine-tuning and optimizing increases to system
rotational speed below the hover point than the so-
called "idle-up". If it is nevertheless preferable for
the helicopter to be programmed "with idle-up", then
deactivate the "throttle limit" function described below
by setting input "Tl16" to "fr".
Note:
If you still use an older rmware than 1102
and you would still prefer to program your
helicopter with “idle-up”, then turn off the
function described below “throttle limit”, by setting the
input “GL16” to “fr”. But again:
The throttle limiter only remains disabled as long as
the input “GL12” is free! Otherwise this input can not
be used!
Meaning and application of "throttle limit"
As already mentioned under "Throttle", and in con-
trast to fixed-wing models, the power output of a
helicopter's drive system is not controlled directly with
the C1 stick, but only indirectly via the throttle curve
settings in the »Helicopter mixer« menu or – if the
model features a speed controller – via that mecha-
nism.
Note:
Of course for different ight phases, ight
phase programming can be used to set
individual throttle curves.
Nevertheless, both methods of output control de facto
result in the helicopter carburettor never approaching
anything near its idle speed under "normal" flight con-
ditions, and that the motor can therefore neither be