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C4 - GENERAL
is head speed important when I am hovering ?
If the rotor
head speed is too low, the helicopter will be virtually
uncontrollable, and a typical sign of too slow a head speed is the
helicopter nodding fore and aft in the hover.
reckon a head speed of around 2200 rpm is correct for a 400-450 size
helicopter nods, or if it is very slow to respond to cyclic inputs,
there is a good chance that the head speed is too slow.
this, you need to adjust the throttle and pitch curves in your radio
(assuming you have a programmable radio that is) Normally, a 5 point
throttle curve should be something like 0, 35, 65, 80, 90, 100, so
that the head speed generated by the motor is between 70% and
80% when the helicopter is hovering.
amount of pitch you have will effect that motor head speed due to
the loading it puts on the motor. a reasonable pitch curve for a
beginner learning to hover is something like 30, 45, 55, 65, 75, 85,
which should give you a pitch range of -4 degrees through +4 at mid
throttle and up to +9 at full throttle.
should give a perfectly acceptable head speed.
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