The effect of bluntness on the drag of spherical-tipped truncated cones of fineness ratio 3 at Mach numbers 1.2 to 7.4 Page: 4 of 20
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NACA RM A52B13
diameter to base diameter from O to 0.50. All models had a fineness
ratio of length to base diameter of 3.
SYMBOLS
A frontal area of model, square feet
total drag
CD total drag coefficient otal drag
CD total drag penalty compared to the cone (CDmodel - Ccone)
CDb base drag coefficient base drag>
(D qA I
CD in-friction drag coefficient Askin-friction drag
CDv total drag coefficient based on volume to the two-thirds power
total drag
gv2/3
CD , wave drag coefficient ave dra
d diameter of the base, feet
dn diameter of the nose, feet
M free-stream Mach number
q free-stream dynamic pressure, pounds per square foot
R free-stream Reynolds number, based on axial length of model
V volume of model, cubic feet
MODELS
The models tested were truncated circular cones with tangentially
connected spherical nose segments, as shown in figure l(a). All models
had a fineness ratio of 3, with base diameters and lengths of 0.45 and
1.35 inches, respectively. The models had holes bored in their bases for
aerodynamic stability. Five different shapes were tested with nose diam-
et WE0, 7-11/2 percent, 15 percent, 30 percent, and 50 percent of the
base diameter.
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Sommer, Simon C. & Stark, James A. The effect of bluntness on the drag of spherical-tipped truncated cones of fineness ratio 3 at Mach numbers 1.2 to 7.4, report, April 25, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59210/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.