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7 votes

why does the rotor could head (Nr) "overspeed" if the collective is lowered suddenly, what is the Physics behind it

On a turbine helicopter, the engine is being managed by a governor that maintains the rotor RPM (that you trim to a specific value in the green arc). When you move the collective, you are changing the ...
John K's user avatar
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5 votes

why does the rotor could head (Nr) "overspeed" if the collective is lowered suddenly, what is the Physics behind it

The engine keeps pushing the rotors just as hard (at least at first), but the drag goes down so the rotors speed up. You've got the metaphor backwards. Imagine instead that you are removing a bolt ...
Chris's user avatar
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