Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1996-10-22
1999-05-11
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244199, B64C1/26
Patent
active
059019255
ABSTRACT:
A novel set of serrated-planform lifting surfaces produce unexpectedly high lift coefficients at moderate to high angles-of-attack. Each serration, or tooth, is designed to shed a vortex. The interaction of the vortices greatly enhances the lifting capability over an extremely large operating range. Variations of the invention use serrated-planform lifting surfaces in planes different than that of a primary lifting surface. In an alternate embodiment, the individual teeth are controllably retractable and deployable to provide for active control of the vortex system and hence lift coefficient. Differential lift on multiple serrated-planform lifting surfaces provides an means for vehicle control. The important aerodynamic advantages of the serrated-planform lifting surfaces are not limited to aircraft applications but can be used to establish desirable performance characteristics for missiles, land vehicles, and/or watercraft.
REFERENCES:
patent: 2924400 (1960-02-01), Ruget
patent: 3471107 (1969-10-01), Ornberg
patent: 3883094 (1975-05-01), Mederer
patent: 4378922 (1983-04-01), Pierce
patent: 4569494 (1986-02-01), Sakata
patent: 5088665 (1992-02-01), Vijgen et al.
patent: 5282591 (1994-02-01), Walters et al.
patent: 5518204 (1996-05-01), Tracy
patent: 5542625 (1996-08-01), Burhans, Jr. et al.
J.E. Lamar, "Nonlinear lift control at high speed and high angle of attack using vortex flow technology", AGARD Report No. 740, Feb. 17-21, 1986, pp. 4-1-4-16, 4-19, 4-20, 4-21, 4-22.
J.E. Lamar et al., "Aerodynamic features of designed strake-wing configurations", AIAA-81-1214, Jun. 23-25, 1981, pp. 1-10.
S. B. Kern, "A numerical investigation of vortex flow control through small geometry modifications at the strake/wing junction of a cropped double-delta wing", AIAA-92-0411, Jan. 6-9, 1992, pp. 1-16.
McGrath Brian E.
Wood Richard M.
Administrator, National Aeronautics and Space Administration
Barefoot Galen L.
Chasteen Kimberly A.
Singer Bart A.
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