Materials and Methods of Construction in Light Structures Page: 13 of 38
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N.A.C,A. Technical Memorandum No, 515
suited to small-scale production, it may be-very econom-
ical in mass production. In mass production it.is, of
course, obvious that even expensive equipment may not ul-
timately greatly increase the cost of the individual air-
plane.- Of course cheaper equipment would still further
reduce this cost. Moreover, oven an article in mass pro-
duction can be superseded by better types, thus causing
the loss of much capital through, the scrapping of the ex-
pensive equipment while, in the contrary caso, conversion
of the factory would be greatly facilitated.. .bvipusly
the equipment for making a given typo of airplane would
always bo more extensive and comploto, the larger the
series to be produced. The difference in cost between the
equipment required for an airplane of simple design and
one of more elaborate design will thorofore.always be rol-
atively the same.
In individual construction, all the transverse frames,
ribs, fittings, etc., are tested separately, in order that
any defects may not be first discovered in assembling,
when they would cause loss of time, or even ..ater in the
finished airplane, where they might do still more harm.
The assembling is greatly accelerated by having all-. connec-
tions, bearings for the conduits, control rods, instruments
and all the parts ready in advance. By such methods we
have effected a saving of 30-50% in time.
All orders are calculated by a practical systom and
their corresponding production times comparod. Thus a. roc-
ord is obtained of the work expended on the airplane it-
solf and also of the "unproductivo" work ox2ended on the
factory oquipment In like mannor a record is kept of the
time spent in the preparation of the working drawings.
Thus all timo-robbing methods weor tested and in many in-
stances woro e roatly simplified.
All changes in design aro immediately introduced into
the drawings. In order that this may not be overlooked,
the head of the workroom calls attention in writing to all
corrections and changes, which must then be mado in the
drafting room. A complete set of the drawings and lists
of parts is filed for every airplane, so that, in connec-
tion with. any subsequent exp-oriences of this airplane, it
is always possible to tell just how eny given part was
The whole system of cooperation between the drafting,
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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/m1/13/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.