Materials and Methods of Construction in Light Structures Page: 15 of 38
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'T.A.C.A. Technical Memorandam jo. ,515
When roforro to aqu.;l weight, somewhat loss than 60%
of the working time used for the wing girdor a was ro-
quired for the wing girdor b of the commercial airplano,
This improvement cxtondded to all parts of the wing girdor,
since the shares of the different working times wore ap-
proximately equal for the girders a and b.
The greatest saving was -probably in the assembling
and riveting of the longitudinal walls, whereby .-working
times in the ratio of 13/8 wore attained. This improve-
ment was effected, in the first placo, by .a simple stamp-
ing process, by which the edges of the openings in the lon-
gitudinal walls, corresponding to a template, were worked
out by a stamping tool, and in the second place by machine
riveting. (Figures 3 and 4.)
Figure 5.shows the longitudinal wall of a wing girder
in which the diagonals are reinforced by riveted sections
or profiles instead of by bending out the edges of the
oenings. The present method of bending out the edges of
the openings according to a template is considerably more
practical, however. .....
Table II gives the relative working times for the pro-
duction of the whole wing, whose girders formed-the basis
of Table I.
Table II. Working Times for the Wings
Kind of work Airplane a Airplane b
Making wing girder 51% 55%
"I leading-edge former 10. I
" end-rib formers 7 7 .
" aileron " 10 9
" ailerons 18 6
S wing cap 8
Assembling wing 4 4
Total - 100o100
If the working time for the whole wing is referred to
equal weight, the saving for wing b, as compared with
wing a, is only 31,5. against 40% for the girder alone.
This is. because the rounded wing tips, which we here made
for the first time, are quite expensive. The time required
for assembling: the wing is quite small; much smaller, in
fact, than the saving made in the individual parts due to
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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/m1/15/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.