Materials and Methods of Construction in Light Structures Page: 18 of 38
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S.A.C.A. Tochnicsil Hcmorandum io. 515
ideas and exporionces may be for the development of a par-
ticular industry has boon well exemplified in America.
Just at the present time, when more firms are ever
turning to light-metal construction, tremendous amounts
of money and energy could be saved, if each firm did not
have to start anew with the initial researches and over-
come all the primary difficulties by itself; only to ar-
rive ultimately at the same results already obtained by
others. Of course there should be perfect mutual cooper-
ation, and no firm should refrain from participation for
ostensible competitive interests.
Such an exchange of ideas might take the form of an
agreement by which, for the solution of especially diffi-
cult problems, a definite task would be undertaken by each
firm entering into the agreement. On this plan, systematic
investigations might be made of such problems as the tor-
sional resistance of composite cross sections, buckling
resistance of compression members, conservation media, etc.
With the advice and cooperation of the D.VVL. (Deutsche
Versuchsanstalt fi3r Luftfahrt) very useful work could thus
be done, despite the generally limited means available for
the further development of German aircraft.
As regards Dr. Rohrbach's address, I wish first to re-
mark that, in my opinion, the use of wood in airplane con-
struction is still justified for many purposes and will
be continued. Especially in light airplane construction,
where the rapid development of new types is often involved,
wood is the most suitable material. Without time-consum-
ing preliminary work in the construction bureau and with
the help of very simple tools, wood enables the construc-
tion of a new airplane in a fraction of the time required
for an all-metal (especially light-metal) airplane.
However, if a certain type is to be made in large num-
bers, the case is then quite different, and metal construc-
tion may be preferable on account of its special advantages.
Wood is also more suitable for small airplanes, be-
cause the dimensioning and correct shaping of small metal
parts is very difficult if, for the obtention of the requi-
site local rigidity, a great increase in the weight is un-
desirable, in contrast with wood whose dimensions can be
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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/m1/18/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.