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This invention relates to conventional aerofoil and hydrofoil which produce a force perpendicular to the motion called lift. The well known airfoil principal has been applied in producing fixed wings and propeller for aircrafts. This same principal also has been applied to create lift for high speed watercrafts known as hydrofoil.
Due to the upper curved shape of the airfoil the fluid travels faster for a longer path through the top than the bottom of the airfoil producing lower pressure at the top, therefore creating lift.
Conventional aerofoil and hydrofoil usually must past through a fluid to create lift. The present invention is for an aerofoil and hydrofoil that does not need to pass through fluids but create lift by rotating about its axis.
The present invention is for a rotating circular airfoil and propeller system with its main body sectional-shape similar to modern airplane wings, having leading edge and trailing edge, but is symmetrical about its axis. This circular airfoil and propeller system includes a circular hollow at its center where the leading edge begins and a circular outer edge where its trailing edge ends. Pairs of tee-shape fins attached to the top and bottom of the main body, runs radiately from the inner edge to the outer edge, to create centrifugal action of fluid when the circular airfoil rotates about its axis. As a result the fluid in contact to the main body is forced to travel from the leading edge to the trailing edge, on the top and bottom, of the rotating circular airfoil. A force perpendicular to this motion called lift is created as the circular airfoil continues to rotate about its axis.
In the drawings, closely related figures have the same number but different alphabetic suffixes.
10 rotating circular airfoil and propeller system
12 axis of the rotating circular airfoil
14 body-sectional-shape of the airfoil
16 circular inner edge/leading edge of the airfoil
18 circular outer edge/trailing edge of the airfoil
20 angle of attack of the airfoil
22 pair of fins
24 spokes
26 center hole
28 lift force of the airfoil
30 air travel direction when the circular airfoil rotates
32 rotating direction of the circular airfoil and propeller system
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When a conventional airfoil-shape body moves through the air, causing the fluid to travel from the leading edge to the trailing edge, it produces a force perpendicular to the motion called lift. Used in water to create lift the foil known as hydrofoil. In this present invention, the inner edge of the rotating circular airfoil system serves as the leading edge while its outer edge serves as the trailing edge as in the conventional airfoil. When the circular airfoil 10 rotates about it axis, causing the fluid in contact to travel from the inner edge to the outer edge due to the centrifugal action created by fins 22, it produces the same known lift force.
The main body 14 of the rotating circular airfoil is made hollow to reduce weight.
More than two pairs of fins 22 are produced to maximize fluid flow to improve lift.
Provisional Patent Application No. 61/690,279 Filing date: Jun. 23, 2012 Applicant: Thoi H. Huynh and Fuji P. Huynh Title: Rotating Circular Airfoil and Propeller System