Marine propulsion – Screw propeller
Reexamination Certificate
2006-04-11
2006-04-11
Olson, Lars A. (Department: 3617)
Marine propulsion
Screw propeller
C416S19700C, C416S235000
Reexamination Certificate
active
07025642
ABSTRACT:
A boat propeller includes a hub having a front, back, and an axis of revolution extending therebetween. A plurality of blades provide and extend from the hub between the front and back. Each blade includes a surface adjacent of the hub disposed at an oblique angle to the hub axis and a blade tip having an adjacent surface forming a dihedral angle with a surface adjacent to the hub extended on the forward camber only. The surface adjacent to the blade tip is inclined at a greater angle to the hub axis than the surface adjacent to the hub. Each blade includes a trailing edge extending radially from the hub with each trailing edge being substantially straight and a tip is provided joining the trailing edges at approximately a 90° angle. An arcuate leading edge is provided between each blade tip and a hub and a flange is disposed on each blade tip and extends parallel to the hub axis toward the hub back.
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Hackler Walter A.
Lear Baylor, Inc.
Olson Lars A.
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