gyrodyne(redirected from Gyrodynes & Heliplanes)
Also found in: Dictionary.
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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved