A Summary Report on the Effects of Mach Number on the Span Load Distribution on Wings of Several Models Page: 2 of 23
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NASA T chnlcal U
NACA . No. A7C28 3 1176 01434 4155
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NATIONAL ADVISO Y CO1tlTTEE FOR AERONAUICS
A GSUMARAR REOR ON TEi EfFEOTS OF MACHE UMBER
ON TEE SPAN IDAD DIBTIXBtTION ON
WING OE SEVERAL MODELS
By Henry Jessen, Jr.
The change in spanwise load distribution at high Mach numbers
is of considerable interest because lateral movement of the center of
lift affects the trim, stability, and structural factors of safety
of an airplane. The effects of Mach number upon the span load distri-
bution of various airplanes have been predicted from- the results of
several series of model tests in high-speed wind tunnels, but all tests
were not made under comparable conditions. Different model support
struts were used and various methods of tunnel calibration were
employed. Turthermore, the results of the various tests were not
presented in the same manner. This report is an attempt to correlate
these data by reducing them to similar test conditions and parameters.
Although the available data are too meager to permit isolation
of the effects of changes in wing configuration, in a majority of
cases the tests reveal a tendency for the center of lift to shift out-
board with increasing Mach number. The exceptions noted are a wing
with a thickened and swept-back root section which housed an air-inlet
duct, and a highly tapered wing of constant thickness ratio with about
20 of washout.
The theoretical span load distribution was computed and compared
with the wind-tunnel results for the two cases where high-speed air-
foil section data were available and the agreement was quite, satie-
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Jessen, Henry, Jr. A Summary Report on the Effects of Mach Number on the Span Load Distribution on Wings of Several Models, report, July 15, 1947; (digital.library.unt.edu/ark:/67531/metadc57986/m1/2/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.