Effect of Sweepback and Aspect Ratio on Longitudinal Stability Characteristics of Wings at Low Speeds Page: 4 of 20
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NACA TN No. 1093
ht height of horizontal tail measured perpendicular
to extended root chord of wing, feet
R test Reynolds number; no correction for turbulence
factor.
a angle of attack, degrees
A .angle of sweepback of quarter-chord line, degrees
TiP chord'
x taper ratio Root chord\
METHOD OF PRESENTATION OF DATA.
The basic data.on the longitudinal stability
characteristics of wings with a range of sweepback
angle from 00 to 800 and various taper ratiosand
aspect ratios are presented in figures 1 to 38. --
Figures 39 and 40 present data showing_theeffect
of slats and wing twist on the lonbrgitudinal stabilitty....
charecteristics. On esch figure the plan form of the
model tested, the geometric and test parameters of
interest, and the source of the data are given. The
drta are nreaented in the form of curves of 0CL .GD,
and 0m against a and of %O against Cm In order
to establish a basis for comparison of the various
pitching-moment curves all the pitching-moment data
have been transferred to a center-of-gravity location
which results in a static margin of 5 percent mean
aerodynamic chord (dCm = 0.05 at zero lift. The
subscripts after Cm give the location of the center
of gravity to which the moments have been transferred.
The results of the analysis of these-data are summarized
in figure 41.
The results of tests of models with swept-back wings
and horizontal tails are presented in figures 42 to 45.
These data have also been referred to a center-of-gravity
location resulting in a static margin of5 percent mean aero-
dynamic chord at zero lift.3
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Shortal, Joseph A. & Maggin, Bernard. Effect of Sweepback and Aspect Ratio on Longitudinal Stability Characteristics of Wings at Low Speeds, report, July 1946; (https://digital.library.unt.edu/ark:/67531/metadc59851/m1/4/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.