Standardization and aerodynamics Page: 3 of 99
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those obtained by the Eiffel Laboratory (E.L). Having noticed
this fact, the E.L. tested wings having R.A.F. sections Nos. 14,
15, and 16, the same as those tested by the N.PaL,: the'dimen-
sions were, 90 x 15 cm (2' 11.4" x 59"r); the tests being made at
the speeds of 12.2 and 25 m/sec (40' and 82' per sec). The mod-
els tested by the N.P.L. had the dimensions: 45.7 x 7.6 cm (18'
x 3') and were tested at a speed of 12,2 m/sec (40' per sec).
The comparison of the diagrams obtained by plotting the ex-
perimental results, shows that the models tested by the N,P.L.
are better, not only when compared to the plots of the E,L. ex-
periments obtained at 12.2 m/sec (40' per sec), but also when
compared to those obtained at 25 m/sec (82t per sec).
During the war, the French Military Aeromutual Technical
Section sent to -airplane manufacturers the results of the tests
made on wings in both laboratories, and the difference between
the two results led the manufacturers to believe that the wing
sections tested by the NP.L. were better than those tested by
the E.L., the truth being, however, that the sections were geo-
metrically similarand that the difference was due either to
errors in measurement, or to errors in the determination of tie
2nd. The Gottingen Laboratory, comparing its results as ob-
tained in a closed circuit tunnel, with th6se obtained in tests
on spheres made at the E,L. in a tunnel with a sucking fan, and
with those made at the St. Cyr Laboratory in a tunnel with a blow-
ing fan, noted that for certain values of VL/p. the coefficients
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Knight, William; Prandtl, L.; von Karman; Costanzi, G.; Margoulis, W.; Verduzio, R. et al. Standardization and aerodynamics, report, March 1923; (digital.library.unt.edu/ark:/67531/metadc53862/m1/3/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.