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1N.A.C.A. Technical Memorandum No. 616
and scientific research will now be described. The courses of
instruction corrprise lectures on aerodynamics, aerostatics, air-
craft and engine construction, light metals, wireless telegraphy,
general meteorology, aircraft instruments and accessories, tech-
nical problems of air traffic, air-traffic economics, and poli-
tics. A considerable number of these courses include practical
exercises in drafting rooms and laboratories. Collections of
models and airplane parts, drawings, plates, etc., are also used
to supplement the instruction. A further welcome addition is
the aeronautical seminar briefly described at the end of this
report.
Institutes and laboratories for scientific research are now
being developed in connection with the engine laboratory of the
E.T.H. The most important data on the proposed installations
are given below.
The chief means of research in the aerodynamic laboratory
is a free-jet wind tunnel (Fig. 1). The tunnel was designed to
enable the use of all the available space. An elliptical sec-
tion, 2 m (6.56 ft.) wide by 1.5 m (4.92 ft.) high, was there-
fore adopted for the open working portion in which airplane,
wing and fuselage models, etc. are tested, more space being re-
quired in the horizontal width so as to provide sufficient mar-
gin on all sides between the model ahd the limits of the air
stream. Calculation shows that airplane models of 1.2 m (-~-.r'
in.) span can be satisfactorily tested in the proposed air stream.
