Patents by Inventor Cynthia A. Crowell

Cynthia A. Crowell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Helicopter low-speed yaw control
    Patent number: 5209430
    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