Airplane with braced wings and pivoting propulsion devices

Details Airplane with braced wings and pivoting propulsion devices Airplane with braced wings and pivoting propulsion devices

1989-02-09

1991-09-10

Barefoot, Galen

Aeronautics and astronautics

Aircraft, heavier-than-air

Airplane and helicopter sustained

244 7R, 244 45R, B64C 2722

Patent

active

050466844

ABSTRACT:
Conventional cantilever wings of a tiltrotor aircraft are replaced by a joined-wing configuration that eliminates some major speed-limiting constraints of prior tiltrotor configurations--thereby allowing operation into the intermediate speed range of roughly 350 to 450 knots. Joined wings offer relatively rigid, stiffened support for the additional wing-mounted hardware, and also stiffen the system to resist rotor flutter and other sources of aggravated loading, that are characteristic of tiltrotor craft. Joined wings provide this advantage, however, while simultaneously significantly lowering airfoil thickness--and thereby importantly increasing the drag divergence Mach number, and hence the maximum speed. In addition, some joined-wing configurations have significantly lower rotor-wing downwash interactions in hover.

REFERENCES:
patent: 1498412 (1924-06-01), Whiteside
patent: 3404852 (1968-10-01), Sambell et al.
patent: 3797783 (1974-03-01), Kisovec
patent: 4053125 (1977-10-01), Ratony
patent: 4146199 (1979-03-01), Wenzel

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