Standardization and Aerodynamics Page: 4 of 99
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found were much greater than those found by the E.L. and the
St. Cyr Laboratory. The G8ttingen Laboratory explains this dif-
ference by the aerodynamical nature of the air current, turbulent
at the E.L, and at the St. Cyr Laboratory, and non-turbulent at
I may add that the St. Cyr Laboratory has found in two tun-
nels of different diameters with sucking fans at the diffuser
end, the same results as those obtained at Gttingen. We thus
see that differences in results may be due, not only to errors
in testing, but what is of much greater importance, to the aero-
dynamic nature .of the airflow adopted.
It is out of the question that the present state of things
is fraught with danger to the Science of.Aerodynamics As a
matter of fact, when these divergencies are brought before the
public, and especially before airplane manufacturers, as they
must inevitably be, confidence in the work of the laboratories
will be utterly shaken,
The'matter is, therefore, very urgent, and the appointed
task of the proposed congress should be to seek out the truth.
For this purpose the congress should have first to compare to-
gether the results obtained up to date, and then decide on what
comparative tests should be made, and what methods could be em-
ployed, to ensure uniform results. These should, however, be such
that the laws of similitude to be applied in passing from exper-
iments on models to those on full size airplanes shall be of
great r simplicity.
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Knight, William; Prandtl, L.; von Karman; Costanzi, G.; Margoulis, W.; Verduzio, R. et al. Standardization and Aerodynamics, report, March 1923; (https://digital.library.unt.edu/ark:/67531/metadc53862/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.