Characteristics throughout the subsonic speed range of a plane wing and of a cambered and twisted wing, both having 45 degrees of sweepback Page: 4 of 124
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NACA RM A51D27
CD drag coefficient d
CL lift coefficient QlIft)
c section lift coefficient
Cm pitching-moment coefficient about the lateral axis through the
quarter-chord point of the wing mean aerodynamic chord
Cmo pitching-mnoment coefficient at zero lift
- lift-drag ratio
, length of body, feet
M Mach number v
q dynamic pressure ( pV2), pounds per square foot
R Reynolds number (pV
r radius of body, feet
ro maximum radius of body, feet
S area of semispan wing, square feet
t maximum thickness of wing section, feet
V free-stream velocity, feet per second
x longitudinal distance, feet
y lateral distance, feet
a angle of attack of the chord line at wing root, degrees
at angle of twist with reference to root chord (positive for
S coefficient of viscosity of air, slugs per foot-second
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Johnson, Ben H., Jr. & Shibata, Harry H. Characteristics throughout the subsonic speed range of a plane wing and of a cambered and twisted wing, both having 45 degrees of sweepback, report, July 12, 1951; (digital.library.unt.edu/ark:/67531/metadc58856/m1/4/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.