Abstract: A system for improving yaw control at low speeds consists of one strake placed on the upper portion of the fuselage facing the retreating rotor blade and another strake placed on the lower portion of the fuselage facing the advancing rotor blade. These strakes spoil the airflow on the helicopter tail boom during hover, low speed flight and right or left sidewards flight so that less side thrust is required from the tail rotor.
Type:
Grant
Filed:
November 7, 1991
Date of Patent:
May 11, 1993
Assignee:
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
Inventors:
John C. Wilson, Cynthia A. Crowell, Henry L. Kelley