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Aircraft that use an unpowered, freely rotating rotor (like a helicopter's) for lift and a conventional propeller for forward thrust. Unlike helicopters, the rotor isn't powered by an engine; it auto-rotates due to aerodynamic forces as the craft moves forward. This makes them mechanically simpler, more stable, and capable of very short takeoffs and landings, though they cannot hover. They are the quirky, efficient hybrids of fixed-wing planes and helicopters, often seen as utilitarian workhorses.
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