Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1991-02-04
1993-01-26
Barefoot, Galen
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244123, 244 76R, 114127, 114162, 114140, 416240, B64C 352
Patent
active
051816784
ABSTRACT:
A flexible airfoil section for a wing or a blade comprising a streamlined shape and an elastic structure whose stiffness distribution along its chord and span is tailored to provide a desirable cambered shape with proportional increases in camber with increases in lift, mounted to a supporting structure such that the airfoil sections are free to pivot about axes near their leading and trailing edges. In operation, the foil derives much of its lift from elastic bending deformation of its flexible shape, thereby achieving a higher lift than a symmetric foil at the same angle of attack while postponing the onset of flow separation and stall and, for operation in water, of ventilation and cavitation. A wing or blade of general planform comprising flexible elastic airfoil sections which can be used to stabilize, or to control the direction of travel of, as well as provide side force for, a watercraft such as a sailboat or a sailboard, or for application to a variety of aircraft components and configurations to provide lift and side force and as well can serve as the aerodynamic surfaces of various types of fluid machinery including fans, helicopter rotors and wind turbines operating in subsonic flow.
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Rockwell International, Highly Maneuverable Aircraft Technology (HiMAT).
Evernham Jeffrey T.
Gorgen William E.
Widnall Sheila E.
Widnall William S.
Barefoot Galen
Cohen Jerry
Flex Foil Technology, Inc.
Kaye Harvey
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