Definition
Gyroplane means a rotorcraft whose rotors are not engine-driven, except for initial starting, but are made to rotate by action of the air when the rotorcraft is moving; and whose means of propulsion, consisting usually of conventional propellers, is independent of the rotor system.
Source: 14 CFR § 1.1 (verbatim from the Federal Aviation Regulations).
Where This Term Is Used
1 section references this term in their FAR Decoded content.