The 1926 German Seaplane Contest Page: 5 of 35
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N.A.C.A. Technical Memorandum Io. 454
be rewarded and the heavier one penalized, which is in the sense
of the rating. This applies, however, only when the engine pow-
ers do not differ much from one another. (In the South Germany
flight, for example, engines ranging from 20 to 240 HP. were used.
The weight per horsepower was naturally more favorable for the
220 HP. engine than for the 20 HP. engine. As regards assumption
2, seaplanes with large engines have the advantage of seaplanes
with small engines. When the participation of engines of very dif-
ferent powers is to be expected, this circumstance can nevertheless
be easily taken into account.)
Assumption 3, that the weight of an empty seaplane stands in
a definite ratio to its total flying weight, is justified in so
far as the heavier seaplane is penalized in relation to the light-
er one. This is correct, however, only in comparing seaplanes
having the same safety factor. If a seaplane, however, is built
with an exceptionally large safety factor with respect to its in-
tended use, it is naturally heavier than another and stands lower
in the rating. In this point, an adaptation to the strength of
the seaplane would be necessary.
Assumption 4 means that the capacity of the airplane will be
rated by so much higher, the lower the fuel consumption is. This
is simply to rate the fuel consumption, which is extremely impor-
tant in its relation to the flight range. Whether the fuel con-
sumption is rated in this or in some other way is, in the ultimate
analysis, only a matter of preference.1
4
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Seewald, F.; Blenk, H. & Liebers, F. The 1926 German Seaplane Contest, report, March 1928; (https://digital.library.unt.edu/ark:/67531/metadc65292/m1/5/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.