The hinge at the root of a helicopter rotor blade with its axis perpendicular to the plane of rotation. It allows the blade tip to move back and forth in its plane of rotation. Movement about the alpha hinge is called drag. Drag dampers oppose this movement. Also called a lead-lag hinge or a hunting hinge.
drag. Drag dampers oppose this movement. Also called an alpha hinge or a hunting hinge.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved