Materials and Methods of Construction in Light Structures Page: 5 of 38
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IT.A..CA, Technical i rcmorandun No. 51$
to 4004, as shown by the following figures: Berlin, 1.25
gold marks; Stuttgart, 0,98; Copenhagen, 1.70; Italy,
0,40; England, 1.35.
Political influences may affect the cost of produc-
tion similarly to the above-meontionod differences in
wages, In this connection your attention is called to the
position of the French firms, some of which manufacture
on a very large scale, and to most of the German and many
.of the English firms, which now make only single airplanes
or very small series.
In the course of time, however, the rates of exchange
and. the wage levels of the different countries will ap-
proach one another near enough so that the production
costs will beo overywhero approximately the same, provided
the different efficincieos of the individual workmen, as
also the different taxes, special levies, duties, etc.,
The W.G.L. has hitherto .devoted itself almost exclu-
sively to aerodynamic or strength problems. In this re-
snoect, we have already made so much progress that a re-
duction of 10% inthe drag or in the weight of an airplane
represents a remarkable improvement.
As regards production problems, however, we have made
so little progress that difforoicos of 100% or more in the
production time are almost the rule for airplanes which,
at first glance are seemingly similar and which, moreover,
seem equally well adapted to their purpose.
As a scientific society, the W.G.L. can take no di-
rect interest in the costs as such, but only in so far as
they determine the limits for the application of scien-
tific data with respect to the greatest possible fulfill-
ment of purposes and practical development in particular
directions, in which applied science.must precede in or -
dor-to assist in solving the aerodynamic and strength-:
probloems involved. This influence of the production prob-
loms has always boon prosont, but in the future it will be
increasingly decisive for the success of certain designs,
because they will differ so little in their suitability
for a given purpose, but probably very much at first in
their production costs.
I will now discuss briefly a, few questions which af-
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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/m1/5/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.