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National Advisory Committee for Aeronautics, Report - Aerodynamic Characteristics of Airfoils III - Continuations of Reports Nos. 93 and 124

This collection of data on airfoils has been made from the published reports of a number
of the leading aerodynamic laboratories of this country and Europe.1 The information which
was originally expressed according to the difierent customs of the several laboratories is here
presented in a uniform series of charts and tables suituble for the use of designing engineers and
for purposes of general reference.
It is a well-known fact that the results obtained in ditterent laboratories, because of their
individual methods of testing, are not strictly comparable even if proper scale corrections for
size of model and speed of test are supplied. It is, therefore, unwise to compare too closely,
the. coeficients of two Wing sections tested in difi'erent laboratories. Tests of different wing
sections from the same source however may be relied on to give true relative values.
The absolute system of coefficients has been used. since it is thought by the a ational
Advisory Committee for Aeronautics that this system is the one most suited for inteinational
use and yet. is one for which a desired transformation can be easily made. For this purpose
:1 set. of transformation constants is included in this report.
Each airfoil section is given a reference number, and the test data are presented in the
form. of curves from which the coefficients can be read with sufficient accuracy for designing pur-
poses. The dimensions of the profile of each section are given at various stations along the
chord in per cent of the chord, the latter also serving as the datum line. When two sets of
ordinates are necessary, on account of taper in chord or ordinate, those for the maximum sec-
tion (at center of span) are given on the individual characteristic sheets while those for the tip
(dotted) section are given in separate tables. Where the ratio of ordinate to chord remains con-
stant the one set of ordinates applies to both center and tip section. The shape of the section
is also shown with reasonable accuracy to enable one to more clearly visualize the section under
mnsidemtion, together with its characteristics.