Patents Assigned to Propeller Design Limited
  • Marine propeller
    Patent number: 4370096
    Abstract: A marine ring propeller comprising blades, each having parallel edges and a constant cross-section, and a ring in the form of an annular shroud fixed to the outer ends of the blades. The shroud is typically frusto-conical on its inner surface and curved on its outer surface to provide an aerofoil cross-section, apart from the leading edge which is provided with a concave bevel on either or both of the inner and outer surfaces.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: January 25, 1983
    Assignee: Propeller Design Limited
    Inventor: Leslie G. Church