Experimental Investigation of a Body Flare for Obtaining Pitch Stability and a Body Flap for Obtaining Pitch Control in Hypersonic Flight Page: 4 of 36
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00 0000 60 " 0 @ 0 00 0 000 0 0 0 00
:*. ** .* : 0* .** .** : :* : ** * *
00. se** :: *.*.-.. . :* . : O . " : " * *
NACA RM A54J13 ::" * .*: *l * , 3
a diameter of cylindrical section of test body, in.
f fineness ratio
L lift, lb
2 length of test body, in.
In length of nose section of test body, in.
M Mach number
q dynamic pressure. _b/sq in.
r radial coordinate, in.
X lcngitudinal coordinate, in.
X center of pressure (measured from nose), fraction of
o angle of attack, deg
8 control deflection angle (positive for trailing edge deflected
downward), deg
EXPEP.IMEfT
Test Apparatus and Methods
The tests were conducted in the Ames 10- by 14-inch supersonic wind
tunnel at Mach numbers of 3.00, 4.23, 5.05, and 6.25. For a detailed
description of this wind tunnel and its aerodynamic characteristics see
reference 5. Lift, drag, and pitching moment were measured with a three-
component strain-gage balance. The balance system measured forces paral-
lel and perpendicular to the balance axis and these forces were, in turn,
resolved to give the lift, drag, and normal forces. Pitching moments were
measured about the body base. Angles of attack up to 5O were obtained by
Rotating the model-balance assembly. In order to obtain angles of attack
greater than 5o, bent-sting model supports were employed. All sting sup-
ports were shrouded from the air stream to within about 0.040 inch of
the model base, thereby eliminating, for all practical purposes, all aero-
dynamic loads on the sting.
Base pressures were measured in all tests and the lift and drag com-
ponents of the resultant base force (referred to free-stream static-S
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Eggers, A. J., Jr. & Syvertson, Clarence A. Experimental Investigation of a Body Flare for Obtaining Pitch Stability and a Body Flap for Obtaining Pitch Control in Hypersonic Flight, report, January 18, 1955; (https://digital.library.unt.edu/ark:/67531/metadc53076/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.