| 摘要 |
A swim fin comprised of a plurality of hydrofoil blades in which the angle of attack of the blades is automatically self-adjusting by use of negative feedback through one or more hydrodynamic control surfaces. The self-adjustment of the angles of the blades results in continuous optimization of the lift vectors throughout the swimming stroke as well as for different swimming speeds and variations in water currents. To further take advantage of the increased efficiency and power, improved hydrofoil blade designs are recommended. These consist of cambered plate profiles optimized for the range of Reynolds numbers observed in scuba diving. Means to precisely define the cambered profiles, which invert between up and downstrokes, are provided. Provision for additional enhancement of power is disclosed in embodiments which multiply the number of hydrofoil blades by stacking the serial blades in substantially parallel planes without altering the overall length or width of the swim fin.
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