Materials and Methods of Construction in Light Structures Page: 16 of 38
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N.A.C.A, Technical Memorandum No. 515
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Figure 6 shows that much working time can be saved by
practical workroom measures alone, even without structural
improvements and without .increasing the scale of produc-
tion. The here diagrammatically represented leading-edge
former and end-rib former before the ailerons belong to
both airplanes, like the previously considered wings and
Conversely, Figure 7 shows how the working time for
the. production of rudders was shortened by purely struc-
Table III shows how the working times for the construc-
tion of a certain transvorso frame were reduced by a com-
bination of structural and workroom methods. (Fig. 8,)
Tablo III. Working Times for Making a Transverse
Frame in a Throo-Year Dovelopment
Working times referred to equal weights
Airplane a 100 Airplane e 98
" b 129 t f 42
" c 120 "g 41
Sd 102 h 28
The working times are again referred to equal weight,
as I am not allowed to give the actual working times. The
comparison is correct; however, in that it concerns the
same transverse frame and the weight of this frame on the
different airplanes remains the same, despite the varia-
tions in structure. It therefore concerns almost exclu-
sively the rapidity of construction.
In the original transverse frame of the first airplane
the profiles were joined by gussets in two planes, which
required very complex dollies for riveting. For this rea-
son the structural method was changed, so that only one
gusset was .used between the profiles. Nevertheless, the
working.time increased, since the workroom was very busy
and many inexperienced workmen had to be employed.
The frame was then somewhat further simplified in
small details and, beginning with airplane f, piecework
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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/m1/16/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.