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C4 - GENERAL - Why does my helicopter "nod" when it is hovering ?

By "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 hover.

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.

HOPE THIS EXPLANATION HELPS ... ?

 

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