Materials and Methods of Construction in Light Structures Page: 4 of 38

IT,A.CA.CA. TPchnical iomorandum ITo. 515

Other condition? are equally important as regards
both production and use, such as the choice of wood or
metal, duralumin or stool, metal or fabric covering, roc-
tangular or toporing wings.
The predominant constructional condition is the shape
of the individual parts, such as tho fittings, wing ribs,
transverse frames of the fuselage, interior wing structure,
junctions and points. of ,separation between the different
parts.
Knowledge regarding the conditions of use and the
best ways to meet them is much further advanced than re-
garding the conditions of production. This is due to the
fact that existing airplanes are quite perfect in most
cases and are compared by fairly disinterested persons.
Airplane structures can therefore be rather quickly adapt-
ed to their conditions of use from the data thus obtained.
By this adaptation to the conditions which areo alike for
all airplanes, different firms arrive at very similar so-
lutions in a comparatively short time. I will mention
only the different single-engine commercial airplanes and
the smaller combat airplanes. The final solutions, and
consequently the similarity of different structural parts,
are roached sooner on small airplanes than on large ones,
because the problems are simpler and because the groator
number of small airplanes in use enables the more rapid
accumulation of the requisite data.
For the contrary reason the development of large air-
planes proceeds much more slowly, and hence they still ex-
hibit a groat variety of arrangements of the wings, power
plants, landing gears and, in fact, of all parts. A
fairly standard type of large airplane will probably be
developed, however, within a few years.
Questions of form and material, which principally con-
ccrn-the conditions of production, will require the long-
est 'time for their bost solution so that airplanes from
different firms will become more or loss similar, as is al-
rea dy the case with automobiles, A bettor or poorer solu-
tion of production problem is expressed essentially only
in the price of the product. This difference is ofte' due
much more to political or financial conditions than to
technical ones, By way of illustration, I will only re-
mind y ou of the fact that the e average e pay for a capable
locksmith, expressed in gold marks, differs greatly in dif-
ferent localities, often amounting to 100% and sometimes

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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/m1/4/ocr/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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