drag damper

drag damper

Devices meant to dampen the dragging action of helicopters' rotor blades. They are fitted between the rotor blades and part of the hub on all rotor systems in which dragging takes place. For damping, a hydraulic or friction system is usually employed at the root of the helicopter main rotor blade.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved