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If any parameter is set incorrectly, it is possible that this setting can
no longer be overridden via a radio signal. This may lead to an
incontrollable crash of the helicopter.
Even when overriding is possible, it is usually the case that the pilot
cannot react fast enough to make the appropriate correction. For this
reason you must procede carefully when adjusting any settings.
Of all the parameters, the following are the most critical: polarity of
the sensors, all swashplate parameters, the Hiller ratio of the control
loop.
-Pre-flight check
Prior to each flight, you must double-check the active direction of the
sensors and the setting of the swashplate parameters. You can do
this without using the software, simply by lifting up the helicopter at
its rotor head, after it has been turned on and initialized. To test effective
direction, simply move the heli in your hand along all axes. The
direction of swashplate movement always needs to be the opposite
of the direction of motion. In multi-blade rotor heads there can be a
timelag. In this case you may take the rotor blades as a point of
reference.
To check the swashplate settings you need to give stick input to all
functions prior to start. Check that cyclic and collective are responding
in the right directions.
The Hiller ratio is checked by brief consecutive inputs to elevator and
aileron. After each input the swashplate must move back approx.
30% of the way immediately. Subsequently the swashplate moves
back slowly the rest of the way.
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