Materials and Methods of Construction in Light Structures Page: 21 of 38
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I.A;C.A. Technical Memorandum No. 515
Director Bittler.- I consider it a particularly happy
thought of the W.G.L. to give one of our most prominent
airplane constructors the opportunity to speak at this
year's session on airplane material and production prob-
lems. This subject is especially appropriate for the pres-
ent time, when our airplane industry, largely freed from
the bonds of the London ultimatum, is on the threshold of
a new phase of development. As compared with the indus-
tries of other countries, our German airplane industry is
obliged to struggle for existence because, aside from a
few sort airplanes, it can produce only commercial air-
pl..nes, since it is barred from the most important field,
that of military airplanes. It must therefore stake ev-
erythi ng on developing the field remaining to it as thor-
oiighly ts possible, a problem which will be solved only
when it succeeds in an over increasing extension of air
traffic and in reducing the cost so that great numbers of
our people will be enabled to travel by airplane.
The cost of flying depends chiefly on throo factors:
fuel consumption, original cost of airplane, and aiaort'i-
zation. When calculated per passenger for all throe of
the factors a donsiderably loss favorable result is ob-
tained than for transportation by railroad or automobile.
Air-:lano manufacturers and air-traffic companies must
thoroforo cooperate to reduce these costs. The .fuol prob-
10m ma; soon beo solved favorably for Gorman air traffic
since, although Germany constitutes but a srall. part of
the world's fuel market, there is just developing an ad-
vance of the powers on the German mark.ot, which betokens
possibilities regarding its rolativo importance and which
may again change Grmany from an object to a subject of
world politics, Tihe work of the dye trust in obtaining
liouid fuels from coal is becoming increasingly important
,nd may yet make Gormany indepondent of other countries
for its fudl supply and considerably reduce the cost of
In the second place, the cost of flying depends on the
original cost of the aircraft and., through this, also on
the third factor, tae d st of amortization. Though the
amortization of the engine is a more important factor than
that of the cell, the latter constitutes, however, so large
a percentage that any reduction in its cost must materially
affect the cost of amortization. Hence, if air traffic is
to be mae cheaper, the ,irpilane :industry can make a sub-
stantial contribution by reducing the cost of production.
Dr. Rohrbach has already indicated, in his very interest-
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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/m1/21/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.