Patents by Inventor David G. Matsuka

David G. Matsuka 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).

  • Rotor system having alternating length rotor blades and positioning means therefor for reducing blade-vortex interaction (BVI) noise
    Patent number: 5620304
    Abstract: A Variable Diameter Rotor (VDR) system (4) having telescoping odd and even blade assemblies (O.sub.b, E.sub.b) wherein the odd blade assemblies define a radial length R.sub.O and the even blade assemblies define a radial length R.sub.E. Each blade assembly (O.sub.b, E.sub.b) defines an internal chamber (64) for accepting a positioning mechanism (70) operative to effect telescopic translation of the blade assemblies (O.sub.b, E.sub.b) such that the radial length R.sub.E of the even blade assemblies (E.sub.b) is equal to the radial length R.sub.O of the odd blade assemblies (O.sub.b) in a first operating mode, and such that the radial length R.sub.E is between about 70% to about 95% of the length R.sub.O in a second operating mode.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: April 15, 1997
    Assignee: Sikorsky Aircraft Corporation
    Inventors: David G. Matsuka, Edward W. Gronenthal, Robert C. Moffitt