Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1987-08-27
1989-04-25
Barefoot, Galen
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244 49, B64C 356
Patent
active
048240532
ABSTRACT:
A telescopic airfoil comprising a plurality of short wing sections, each consisting of skin and rib, with tubular spar sections attached to the rib. Each spar section is adapted to telescope with respect to the next adjoining spar section toward the root end of the airfoil. Alternate spar sections are rotatable, and intermediate spar sections are held stationary, with the end portions of adjacent spar sections overlapping, and low-friction threads connecting the overlapping spar portions. The threads at opposite ends of each spar section are of opposite hand so that rotation of the rotatable spar sections causes the entire group to be drawn together into a housing at the root end of the wing. In this way, the wing span can be reduced to less than 30% of the full span, while during extension and retraction, the spars retain their full load-carrying capability.
REFERENCES:
patent: 2056188 (1936-10-01), Hayden
patent: 2423095 (1947-07-01), Gibson
patent: 3851978 (1974-12-01), Kuipers
Barefoot Galen
Corl Rodney
Kidder Herbert E.
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