I remember the tale of a Bf109 which was downed during WW2 - by an Avro Rota autogyro (or it could have been a Cierva C30).
Doing radar calibrations south of Portsmouth when the '109 jumped him thinking it would be an easy kill.
After trying to dodge him, the 109 dived on him, the autogyro pilot simply slowed right down very quickly and the '109 overshot him straight into the sea.