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US 6,302,652 B1Granted
Elliptical propeller and windmill blade assembly
AssigneeGeneral Dynamics Government Systems Corporation
InventorJohn Edward Roberts
Life of this patent
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Abstract
Non-planar propellers or windmill blade assemblys are proposed which have tips that are curved to point in the same direction as the axis of rotation of the propeller. This non-conventional design results in a stronger, stiffer, and more efficient propeller or windmill.
Claims7
A rotational turbine comprising a hub and at least one blade attached to said hub;
- said blade curved along its entire length in the direction of the flow;
- wherein said blade has a cross section shaped with a thick leading edge, thin trailing edge, curved back and flat face;
- said blade further having a pitch angle that increases from the tip of the blade to the end of the blade adjacent to the hub;
- and said blade having a blade tip curved to point only in the direction of the fluid flow through the turbine to increase the ratio of the concentration of streamlines perpendicular to the cross-section of the turbine before and after the turbine.
1 more element
Dependencies are inferred from the claim text.