Materials and Methods of Construction in Light Structures Page: 22 of 38
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N.A.C.A. Technical Memorandum ITo. 515
ing address, the savings effected br piecework and also in
the case of the last airplane of a series of several as
compared with the first one of the series. A still larger
reduction in the cost of production can surely be effect-
ed by making airplanes on a larger scale than heretofore
and by the standardization of materials and individual
parts. You all know what a struggle for existence the
German automobile industry had to go through in competi-
tion with American automobiles. That it has succeeded in
improving the sales ratio of German cars to American cars
is, aside from the quality of the German cars, principally
due to the standardization, which the German automobile
industry has so vigorously prosecuted for the last two
years, that the original very considerable American lead
has already been largely abolished and the production cost
of the German cars has boon substantially reduced.
The opinion may be held that airplane construction is
still in such a stage of development that any standardiza-
tion would harmfully affect the freedom of the construct-
or, Doubtless any such extensive standardization as has
been effected in automobile construction would yet be un-
suited to airplane construction, but there are, however,
many parts and materials for which standardization is very
desirable, such as connections, fittings, instruments,
tubes and wires, As to parts for which no rigid standard-
ization is yet feasible, the preparation of provisional
standardization sheets would be very helpful,. In airplane
construction where, of course, not so many pieces of a kind
are wanted, as in automobile construction, the creation of
apparatus and instruments cannot be profitably carried so
far, because the cost of many of the parts would thereby
be too greatly increased. Hand work must therefore be
done which, however, is more expensive and not nearly so
good as machine work. By careful investigation many a
part can be found which is the same or similar on all air-
planes and could be standardized and made much cheaper.
Group manufacturing would enable considerable econo-
mies in lessening transportation costs, simplifying re-
vision, etc. Division into very small units would also
enable the employment of cheaper labor. Unfortunately the
small number of airplanes to be made prevents any exten-
sive introduction of this method.
igincer M. NITeubort.- In his discussion of the queos-
tion "Duralumin or steel?" Dr. Rohrbach took as his basis
a comparison of the tensile strengths bf these materials
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Rohrbach, Adolf. Materials and Methods of Construction in Light Structures, report, May 1929; (https://digital.library.unt.edu/ark:/67531/metadc65364/m1/22/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.