Patents by Inventor Eric C. Stewart

Eric C. Stewart 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).

  • Airplane automatic control force trimming device for asymmetric engine failures
    Patent number: 4648569
    Abstract: The difference in dynamic pressure in the propeller slipstreams as measured by sensors 20 and 20a is divided by the freestream dynamic pressure generating a quantity proportional to the differential thrust coefficient. This quantity is used to command an electric trim motor 26 to change the position of trim tab 14 thereby retrimming the airplane to the new asymmetric power condition. The change in position of the trim tab produced by the electric trim motor is summed with the pilot's input to produce the actual trim tab position.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: March 10, 1987
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Eric C. Stewart