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

Glossary

What is an autogyro?

Another name for a gyroplane. The same aircraft, not a different one. "Autogiro" with an i was Juan de la Cierva's trade name for his machines; the spelling with a y became the ordinary word and is still common in older books and outside the United States.

Also called Autogiro, gyro

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.

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