Effects of sweep on the damping-in-roll characteristics of three sweptback wings having an aspect ratio of 4 at transonic speeds Page: 4 of 24
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NACA RM L50J19
y spanwise distance from plane of symmetry, feet
Cp damping-in-roll coefficient (i )
q effective dynamic pressure over span of model, pounds per
square foot oV2
iCN increment in rolling-moment coefficient caused by wing twist
pb/2V wing twist at tip; equivalent to wing-tip helix angle of a
rolling wing, radians
p rate of roll, radians per second
V ' airspeed, feet per second
p mass density of air, slugs per cubic feet
a, angle of attack, degrees
A angle of sweep of wing quarter-chord line, degrees
M effective Mach number over span of model S cMady
Ma average chordwise local Mach number
MI local Mach number
CLe lift-curve slope, per degree
MODEL AND APPARATUS
The semispan models used in the investigation had quarter-chord
sweep angles of 00, 350, and 450, the wings had an aspect ratio of 4.0,
taper ratio of 0.6, and an NACA 65A006 airfoil section parallel to the
free stream. The pertinent dimensions of the basic wings are given
in figure 1. A typical model setup is shown by the general arrangement
of the unswept wing in figure 2. The quarter-chord station of the wing
mean aerodynamic chord was always located on the balance center line,
and the nose of the fuselage at 7.07 inches ahead of the center line.
The ordinates of the fuselage of fineness ratio 10 can be found in
table I of reference 3. The unswept wing and the 450 swept wing were
made of steel surfaced with bismuth-tin alloy while the 350 swept wing
was machined of solid steel. The fuselage was machined of brass.
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Lockwood, Vernard E. Effects of sweep on the damping-in-roll characteristics of three sweptback wings having an aspect ratio of 4 at transonic speeds, report, December 14, 1950; (https://digital.library.unt.edu/ark:/67531/metadc58833/m1/4/: accessed March 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.