Blunt-leading-edge raked wingtips

Details Blunt-leading-edge raked wingtips Blunt-leading-edge raked wingtips

1998-06-12

2000-07-18

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244 45R, B64C 310

Patent

active

060895020

ABSTRACT:
An airplane having a fuselage (11), opposed main wings (12), and blunt-leading-edge raked wingtips (8) is provided. Each main wing includes an outboard end (9) and a leading edge (14) having an outboard end leading-edge nose and nose radius. One blunt raked wingtip (8) is located at each main wing outboard end (9) and includes a leading edge (20) swept back from the main wing leading edge (14). Each blunt raked wingtip (8) further includes a plurality of local airfoils each having a leading-edge nose radius and a chord. The nose radius is greater than about 2% of the local chord for the majority of the airfoils. The relative bluntness of the raked wingtips minimizes boundary-layer separation, drag associated with boundary-layer separation, and premature buffeting of the aircraft during low speed flight.

REFERENCES:
patent: 2575185 (1951-11-01), Mulholland
patent: 2709052 (1955-05-01), Berg
patent: 4248572 (1981-02-01), Fradenburgh
patent: 4700911 (1987-10-01), Zimmer
patent: 4776542 (1988-10-01), Van Dam
patent: 5039032 (1991-08-01), Rudolph
patent: 5348253 (1994-09-01), Gratzer
"Wind Tunnel Tests Favor Raked Tip Wings," by Debbie Nomaguchi, Boeing News, published Jun. 27, 1997.

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