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Multiplex Cockpit MM Manual

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8.6.6. The starting procedure
Before you start the motor in your helicopter always carry out a safety check:
• Is the model in sound mechanical order?
• Are the radio control system and batteries in serviceable condition?
• Do the controls respond in the correct direction to transmitter commands?
• Is the gyro set to provide the correct direction of correction, and is it secured
firmly in the model?
Move the collective pitch stick to the collective pitch minimum position and the
idle-up slider to the idle position (between motor stopped and centre). Hold the
main rotor firmly in one hand while you start the motor. Do not let go of the main
rotor at this stage!
When the motor is running it must be adjusted to obtain smooth running. With the
COCKPIT
MM
this does not have to be done with the model in flight. A full throttle
check can be carried out on the ground using the idle-up slider.
Important:
Before you do this move the collective pitch stick to the collective pitch minimum
setting and keep it there.
Now you can slowly advance the throttle using idle-up until the motor reaches full
throttle, without having to lift the model off the ground. To place an adequate load
on the motor, apply negative collective pitch to the same magnitude as required for
climbing.
Once the motor is correctly adjusted, move the auto-rotation switch to the auto-
rotation setting. Now adjust the AROT GAS value (see 8.6.4) to a point where the
motor runs reliably at a fast idle, but the clutch shows no tendency to engage.
Once you have set up the auto-rotation throttle setting correctly, for safety’s sake
we recommend that you always start the motor in the auto-rotation setting. This
ensures that there is no danger of the motor suddenly speeding up if you should
accidentally move the collective pitch stick (e.g. when placing the transmitter neck-
strap over your head).
8.6.7. Test flying
The most important stages in test-flying a helicopter are adjusting the:
• throttle and collective pitch curves, and
• static tail rotor compensation.
Throttle and collective pitch curve
The first step is to adjust the throttle and collective pitch curve to match each other.
The aim of this process is to achieve a constant system rotational speed over the full
collective pitch range when the throttle idle-up slider is at centre (see 8.6.5). This
adjustment is carried out by varying the servo settings for centre and end-points
(see 8.3.2).
Caution:
These values should only be altered when the model is on the ground.
Cut the motor before making any changes.
… 39 …


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Multiplex Cockpit MM User Manual - German - 48 pages

Multiplex Cockpit MM User Manual - French - 48 pages

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