Duo-propellers and single propellers
AssigneeSharrow Engineering LLC
InventorGregory C. Sharrow
Life of this patent
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Abstract
A duo propeller disclosed having a forward propeller having increased loading distribution and high swirl near the tip. The duo propeller has an aft propeller with a more optimal loading distribution that can cancel the high tip swirl from the forward propeller. The duo-propeller an enhanced ability for the aft propeller to capture the energy lost to the swirling flow of the forward propeller's outflow.
Claims28
A method of increasing propeller efficiency swirl in a duo propeller, the duo propeller comprising a forward propeller and an aft propeller operating in series on co-axial counter rotating shafts, the method comprising:
- selecting the diameter of the aft propeller to be in the range of 100% to 175% of the forward propeller, and
- controlling the generation of swirl energy by the forward propeller and recovery of the swirl energy by the aft propeller by varying the camber and pitch angle (tip loading) while minimizing tip vortices.
A duo propeller comprising:
- a forward propeller and an aft propeller operating in series on co-axial counter rotating shafts, wherein the diameter of the aft propeller is within the range of 100% to 175% of the forward propeller;
- and
- a pitch angle and camber to optimize generation of swirl energy by the forward propeller and recovery of swirl energy by the aft propeller while minimizing tip vortices.
Dependencies are inferred from the claim text.