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Yellow enclosed-cabin gyroplane in flight against a clear blue sky

Glossary

What is prerotation?

Spinning the rotor up mechanically before takeoff, so the blades are already turning when the ground roll begins. It shortens the roll; it is not what keeps the rotor turning in flight.

That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.

All glossary terms