Wing with a wing grid as the end section

Details Wing with a wing grid as the end section Wing with a wing grid as the end section

1996-02-01

1998-10-20

Mojica, Virna Lissi

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244 48, 244218, B64C 0342, B64C 0354, B64C 2306

Patent

active

058234802

ABSTRACT:
A wing with a wing span (b) has a main part (1), which has a substantially closed surface with respect to the flow (v) and is provided at its free end with an end section in the form of a wing grid. The wing grid has at least two parallel-staggered winglets (2). The wing grid as part of the wing span (b) takes over the intended profile circulation at the attachment point to the main part and subdivides that circulation approximately uniformly over the winglets. The same lift is produced in the end section with the at least two winglets. Thus, for the wing the spanwise lift distribution is more regular and the induced resistance is decreased. An upper or lower limit for the action is obtained as a function of whether, as a result of the fixed wing grid for the entire wing, a rectangular circulation distribution is produced or only for the part of the overall span replaced by the wing grid. For the wing with wing grid there is a corresponding reduction of the induced resistance as compared with a conventional wing without a wing grid for the same resulting aspect ratio.

REFERENCES:
patent: 1466551 (1923-08-01), Thurston
patent: 1841921 (1932-01-01), Spiegel
patent: 2743888 (1956-05-01), Lippisch
patent: 4595160 (1986-06-01), Santos
patent: 4671473 (1987-06-01), Goodson
patent: 5312070 (1994-05-01), Arena
ICAS Proceeding, 20th Congrss of The International Council of The Aeronautical Sciences, vol. 2. Sep. 1996.

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