Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1976-01-12
1977-04-12
Blix, Trygve M.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244 41, 244 91, 416 23, 416142, B64C 2300
Patent
active
040170411
ABSTRACT:
Device for diminishing tip vortices in an aircraft. For the purpose of diminishing the tip vortices generated by aircraft there are provided retractable foils at or near the airfoil, as wing, tips in question and projecting upwardly and/or downwardly therefrom. The operation of the retractable foils is satisfactory if such foils are parallel to the centerline of the aircraft but it is preferable if such foils are angled slightly with respect thereto, such as if the leading edge of the upper foil is angled approximately 10.degree. inwardly toward the fuselage of the aircraft and the bottom foil is oppositely angled also approximately 10.degree.. The retractable foils, in addition to diminishing wing tip vortices, also when used on wing tips improve the rate of climb of an aircraft at a given engine setting and appear to diminish the area over which the major amounts of noise generated by the aircraft will be dispersed. The foils may be fully retractable into the aircraft wing, but if not fully retracted, they will each provide a small streamlined ridge projecting upwardly and/or downwardly adjacent the tip of the aircraft wings which will improve the lift characteristics of the wings by diminishing air flow around the end of the wings sufficiently to move than compensate for the drag otherwise created. The foils are also advantageously applicable to other aircraft components, such as flaps, stabilizers or elevators.
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"Vortex Wakes of Conventional Aircraft", Aeronautical Research Associates of Princeton, Inc., Princeton, New Jersey, May, 1975.
Blix Trygve M.
Kelmachter Barry L.
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