Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane and fluid sustained
Patent
1989-10-24
1991-05-21
Barefoot, Galen
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane and fluid sustained
244 23R, 244207, 244208, B64C 2104
Patent
active
050168371
ABSTRACT:
A basic airfoil has its operating performance improved by incorporating one or more apertures in the airfoil adjacent its trailing edge. These apertures extend from the upper surface of the airfoil down through to the lower surface of the airfoil. The entry port and the exit port of these apertures has a greater circumference than that of the throat circumference which is intermediate thereto. This structure forms a venturi having a vertical axis. Spaced below the throat of the aperture are a plurality of air nozzles that communicate with an air plenum chamber within the airfoil. A source of pressurized air is connected to the plenum chamber. The leading edge of the airfoil causes air to flow across both the upper surface and lower surface of the airfoil. The venturi creates a strong suction on the upper surface of the airfoil to enhance the airfoil's pressure differential. When the axis of the venturi is inclined forwardly with respect to the horizontal axis of the airfoil, a vector thrust in the forward direction is created in the same direction as that of the low pressure side of the airfoil. The venturi enhanced airfoil can be utilized both in a horizontal fixed airfoil or its structure can also be incorporated into the tail rudder of an aircraft or helicopter. The venturi enhanced airfoil can be oriented in any position between the horizontal and vertical axes.
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Barefoot Galen
Venturi Applications, Inc.
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