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National Advisory Committee for Aeronautics, Report - A Correlation by Means of Transonic Similarity Rules of Experimentally Determined Characteristics of a Series of Symmetrical and Cambered Wings of Rectangular Plan Form

Transonic similarity rules are applied to the correlation of
experimental data for a series of related rectangular wings of
varying aspect ratio, thickness, and camber. The data correla-
tion is presented in two parts: The first part presents the correla-
tion for a series of 22 wings having symmetrical NAOA 63A-
series sections; the second part is concerned with a study of
one type of camber by correlation of the data for a series of
18 cambered wings having NAC’A 63Ax9XX and 68A4XX
sections.

It was found that the experimental data could be, for the most
part, successfully correlated throughout the subsonic, transonic,
and moderate supersonic regimes and that, by proper choice of
parameters, the force and moment data could be presented
in a concise manner efiectively displaying the transonic char-
acteristics of wings of both large and small aspect ratios. In
many instances it was found possible to predict from the correla-
tion studies an expected range of validity for the linearized or
slender-body theories. It appears that at the sonic speed,
slender-body theory is adequate for rectangular wings of sym-
metrical profile if the product of the aspect ratio and the 1/3
power of the thickness ratio is less than unity.

Recent systematic experimental investigations of the
effects of Wing aspect ratio, thickness, and camber for Wings of
rectangular plan form at transonic speeds (refs. 1 and 2)
have provided data ideally suited for correlation by means of
the transonic similarity parameters (refs. 3 to 12). A data-
correlation study for Wings of symmetrical profiles was made
in reference 8 and a similar study for Wings of cambered
profiles in reference 9. The present report presents the more
important results of these two correlation studies.