Patent ID: 7025642

Claim:
A boat propeller comprising: a hub having a front, back, and an axis of rotation extending therebetween; a conical spinner having a streamlined intersection with the hub front; and five blades extending from said hub between the front and back and each blade having a surface adjacent said hub disposed at an oblique angle to the hub axis and a blade tip having an adjacent surface forming a dihedral angle with the surface adjacent said hub, the surface adjacent the blade tip being inclined at a greater angle to the hub axis than the surface adjacent said hub, said blades being spaced apart around said hub without overlap when viewed along the hub axis, each blade further comprising: a trailing edge extending radially from said hub, each trailing edge being substantially straight; a blade tip joining a respective trailing edge at approximately a 90° angle; an arcuate leading edge extending between a respective blade tip and said hub; a flange disposed on each blade tip and extending parallel to the hub axis toward the hub back, said flange being disposed at approximately a 90° angle with the surface adjacent to the blade tip and including an arcuate edge extending between the leading and trailing edges.