Lift and Drag of Wings with Small Span Page: 2 of 27
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1111 :
NATIONAL ATTaSORY COMMITTEE FOR AERONAUTICS
TECHNICAL MEMORANDUM NO. 1151
LIFT AND DRAG OF WINGS WITH SMALL SPAN*
By F. WeinigAbstract: The lift coefficient o? a wing of small span at first
shows a linear increase for the increasing angle of
attack, but to a lesser degree than was to be expected
according to the theory of the lifting line; thereafter
the lift coefficient increases more rapidly thanlihear)j,
as contrasted with the theory of the lifting line. The
induced drag coefficient for a given lift coefficient, on
the other hand, is obviously much smaller than it would
be according to this theory. A small change in the
theory of the lifting line will cover these deviations.
Outline: 1. Symbols
2. The Previous Treatment of the Wing of Small Span
3. New Treatment Based upon an Enlarged Array of Free
Vortices
4. Summary
5. Bibliography
1. SYMBOLSlift
wing area (F = bt = Wins area for elliptic base
wing chord at any point
wing chord at center of the wing
span
gap of the cascade which is equivalent to the wing profile
with respect to the deflected mass (compare equation (8))
wflight velocity
A
F
t
t
a
Y*"Auftrieb and Widerstand des Tragfl gels kleiner Spannweite,"
Zentrale fUr wissenschaftliches Berichtswesen der Luftfahrtforechung
des Generalluftzeugmeisters (ZWB) Berlin-Adlershof, Forschungsbericht
Nr. 1665, Stuttgart, Sept. 8, 1942.
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Weinig, F. Lift and Drag of Wings with Small Span, report, August 1947; (https://digital.library.unt.edu/ark:/67531/metadc64469/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.