The Determination of Span Load Distribution at High Speeds by Use of High-Speed Wind-Tunnel Section Data Page: 3 of 32
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2
changes in loading are to be expected in the usual
operating lift range, because the thicker inboard sec-
tions of a typical wing would experience a compressi-
bility stall earlier than the outboard sections and would
consequently require the outboard sections to carry a
greater part of the load if the lift is to be maintained.
Except for some unpublished high-speed wind-tunnel re-
sults of wake measurements behind a tapered wing, which
verified the conclusion that stalling occurs earlier
on the root sections than on the tip sections, no direct
experimental data exist on the subject and the actual
magnitude of the span-loading changes has been question-
able.
Although designers are aware, therefore, that
changes occur in the suction lift curves after the occur-
rence of a compressibility stall, airplane wings are
still built to carry the limit loads distributed in ac-
cordance with a lifting-line theory that includes the
assumption that the individual sections along the span
have a constant lift-curve slope throughout the entire
operating range.
The purpose of the present report is:
(1) To present a tabular method oy which the
lifting-line theory may be easily applied to the deter-
mination of the span load distriontion of a wing, re-
gardless of the type of section lift curves.
(2) To present, for two hypothetical wings, com-
parisons of the span load distribution as determined by
means of
(a) The strip theory, in which hIgh-speed
wind-tunnel data are used
(b) The conventional application of the
1Ifting-line theory, in which low-
speed wind-tunnel data are used
(c) The generalized method of applying lifting-
line theory, in which high-speed-wind-
tunnel data are used_I
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Boshar, John. The Determination of Span Load Distribution at High Speeds by Use of High-Speed Wind-Tunnel Section Data, report, February 1944; (https://digital.library.unt.edu/ark:/67531/metadc61274/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.