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C4 - GENERAL
- Why does my helicopter
"nod" when it is hovering ?
"nodding" it means that in the hover the nose of the
helicopter actually moves up and down, giving it a rocking motion
along its length.
This is almost
always due to one thing, and that is that you are hovering with the
head speed far too slow. If you have a programmable radio, you need
to increase the Throttle curve significantly.
If you had a
typical straight line throttle "curve" of say 0%, 25%,
50%, 75%, 100% which certainly is not the best throttle curve at
all, your hover throttle would be about 60% as it is above the 50%
throttle position, and you would want to change it to
something like 0%, 35%, 65%, 85%, 100%. This will bring the
head speed up faster at lower throttle stick settings, and would
increase it to about 70% when the helicopter is actually in the
The other way
to do this is to DECREASE the pitch value at mid throttle setting,
so a pitch range of say 15%, 30%, 50%, 75%, 100% would need to be
changed to about 0%, 20%, 40%, 65%, 80%. This will decrease the
pitch around the hovering throttle level, which will also make the
head speed a little faster.
On most 450
size helicopters a head sped of around 2200 rpm is optimum, and on
500 size helicopter it is common to use around 2600 rpm. If
you have a tachometer you can of course check this by bringing the
helicopter up to speed until it is just about to go light on the
skids, but not ready to take off, and then measure the head speed.
THIS EXPLANATION HELPS ... ?
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