GRAUPNER MC-32 Manual page 203

With this basic set-up complete, the motor should
be started in accordance with the motor operating
instructions: idling can then be configured using the
trim wheel of the throttle/collective pitch stick. The
preset idle position will be displayed on the transmit-
ter's basic display by a horizontal bar next to the C1
trim wheel position indicator. Refer to the description
of digital trim on page 58 of this manual.
The model should lift off the ground with the collec-
tive pitch stick roughly at its centre point and hover
roughly at the expected rotational speed. If this is not
the case, proceed as follows:
1. The model does not lift off until the collective
pitch stick is above the centre point.
a) Rotational speed is too low
Remedy: On the graph page
for "Channel 1  Throttle"
increase the value for
point "1".
b) Rotational speed is too high
Remedy: Increase the
blade angle of attack pitch
by increasing the value of
point "1" on the "Pitch" graph
page.
2. The model lifts off before the centre point is
reached.
a) Rotational speed is too high
Remedy: Decrease the
carburettor opening by
reducing the value of point
"1" on the graph page for
"Channel 1  Throttle".
b) Rotational speed is too low
Remedy: Decrease the
blade angle of attack pitch
by reducing the value of
point "1" on the graph page
for "Pitch".
Important:
These settings must be reconfigured until the
model hovers at the correct rotational speed
with the throttle/collective pitch stick at its
centre point. The configuration of all other model
parameters depends on these settings being made
correctly!
+100%
Standard set-up
Hover
point
Standard set-up is completed on the basis of the ba-
sic set-up described above, whereby the model hov-
ers in normal flight at the correct rotational speed with
the throttle/collective pitch stick set to its centre point:
-100%
1 2 3 4 5
Control travel This means a set-up with which the model is capable
of both hovering and flying circuits in all phases while
+100%
maintaining a constant rotational speed.
Hover
point
Climb settings
The combination of throttle hover setting, collective
pitch setting for the hover and the maximum collective
pitch setting (point "H") now permits, in a simple man-
-100%
1 2 3 4 5
Control travel
ner, a means of attaining a constant rotational speed
from hovering right through to maximum climb.
First, perform a prolonged, vertical climb by moving
the collective pitch stick to its end-point. Compared to
+100%
the hover configuration, motor speed should remain
unchanged.
If motor speed falls off in the climb, even with the
Hover
drive system working at full power and therefore no
point
further power increase is possible, then reduce maxi-
-100%
mum blade pitch angle at full deflection of the collec-
1 2 3 4 5
Control travel
tive pitch stick, i. e. the value of point "H". Conversely,
the attack angle should be increased if motor speed
+100%
is to increase while climbing. Therefore, on the "Pitch"
graph page, put the vertical line on Point "H" by mov-
ing the pitch stick then change this point's value
Hover
appropriately with the  selection keys of the right
point
touch pad.
-100%
1 2 3 4 5
Control travel
This diagram shows only the
changes when setting the maximum
collective pitch value.
Then bring the model back to hover, which should, in
turn, be achieved with the C1 stick at its centre point.
If the hover flight point is now achieved only by mov-
ing the pitch stick away from its centre point toward
"higher" values then this deviation should be compen-
sated by increasing the hover-flight pitch value – i. e.
for point "1" – a little until the model once again hovers
with the stick at its centre point. Conversely, if the
model hovers below the mid-point, correct this by
reducing the angle of attack appropriately.
It may also be necessary to correct the carburettor
opening for the hover point (point "1") with "Channel 1
 throttle".
This diagram shows only the
change to the hover point, i. e.
collective pitch minimum and
maximum are both left at -100 %
or +100 %.
Modify these settings until they really result in a
constant rotational speed over the full control range
between hovering and climbing flight.
Program description - Helicopter mixer
+100%
Hover
point
-100%
1 2 3 4 5
Control travel
+100%
-100%
1 2 3 4 5
Control travel
203