Patents by Inventor David E. H. Balmford

David E. H. Balmford 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).

  • Compound helicopter with engine shaft power output control
    Patent number: 5174523
    Abstract: A compound helicopter includes a main sustaining rotor for hover and low speed flight, a propeller for providing propulsion in high speed flight and an engine. Engine output power is controlled so as to ensure efficient use of available power in both modes of operation. A preferred form of control includes a variable area exhaust nozzle from a gas turbine engine which has the advantage also in providing an augmenting jet thrust during high speed flight.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: December 29, 1992
    Assignee: Westland Helicopters Limited
    Inventor: David E. H. Balmford