gyrodyne(redirected from Gyrodynes and Heliplanes)
Also found in: Dictionary.
Related to Gyrodynes and Heliplanes: convertiplane, Compound helicopter
A rotorcraft whose rotors are normally engine-driven for takeoff, hovering, landing, and forward flight through part of its speed range. Its means of propulsion, consisting usually of conventional propellers, is independent of the rotor system.