Materials and Methods of Construction in Light Structures Page: 17 of 38
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N.A.C.A. Technical Memorandum.a No.. 515
was introduced with the result that the working times were
immediately reduced more than one-half. The improvement
from g to h was then effected by a structural change
which, unfortunately, I cannot yet describe for reasons
connected with its patenting.
Similar examples could be mentioned in any desired
number. For example, the working time for the production
of externally similar floats was reduced 40% by the sim-
plification of the frame and a practical method for the
I think there is no need of further oxamples to show
how groat savings in working time can yet be mado. I am
.confident that, oven without very largeo-scale production,
provided we obtain enough orders to maintain the factory
personnel at the present number of several hundred, in a
year or. two we can attain working times of less than half
the present fairly short ones. Metal airplanes, even when
made on a small scale, will then cost considerably less
than wooden ones. do now.
In the WoG,L. lectures, problems are discussed from
all standpoints and possibilities, as to how performance
can be increased per unit weight of the airplane or per
unit weight of fue, etc. Therefore, I wish to thank
the .G.L. for this opportunity to discuss the possibili-
tioes of an hour of human work, which is, after all, our
most valuable asset.
C o m n e n t s
Eninoer Spie2g el.- Dr. Rohrbach's address is espe-
cially, welcome, because it introduces pure production
problems into the circle of those previously discussed
before the W.G.L. Even though, as the speaker remarked,
such questions have little to do with pure science, they
still stand in mutual relations with the latter. Scienco,
on the one hand, assigns certain tasks to the producer
while, onthe othor hand, production problems often afford
the incentive to now scientific rosoarchos.
It would therefore be very desirable in future to
have. such- questions often discussed before the W.G.L., and
thus develop a lively exchange of ideas between the dif-
ferent producers. How advantageous such an exchange of
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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/m1/17/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.