Ram air inflated wing

Details Ram air inflated wing Ram air inflated wing

2005-01-04

2005-01-04

Poon, Peter M. (Department: 3643)

Aeronautics and astronautics

Safety lowering devices

Parachutes

C244S900000, C244S902000

Reexamination Certificate

active

06837463

ABSTRACT:
A wing for a traction kite, etc comprises a plurality of cells formed by chordwise-extending ribs (3), valved openings (6) to the cells allowing ram air to inflate the wing. By changing the initial cut-out of the material forming the cells near wing tips (7, 8), compared with that of the cells central to the wing, it is possible to alter the aerodynamic forces at wing tips (7, 8). This allows attachment of flying lines (9, 10) to wing tips (7, 8) only, despite the wing having no framing to maintain its spanwise shape under the loading of flying lines (9, 10). The increased aerodynamic forces at wing tips (7, 8) are achieved by making the aerofoil profiles of the cells progressively more reflexive towards wing tips (7, 8), by giving wing tips (7, 8) a residual twist increasing their angle of incidence, by placing the centres of pressure of the cells near wing tips (7, 8) somewhat forward of the pivot line of the wing, etc.

REFERENCES:
patent: 4363458 (1982-12-01), Jones et al.
patent: 4708078 (1987-11-01), Legaignoux et al.
patent: 5028018 (1991-07-01), Krebber
patent: 5169092 (1992-12-01), Murakami
patent: 5213289 (1993-05-01), Barresi
patent: 5573207 (1996-11-01), Germain
patent: 5620153 (1997-04-01), Ginsberg
patent: WO 9005663 (1990-05-01), None

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