Technical Aspects of the 1934 International Touring Competition (Rundflug) Page: 17 of 34
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16 - N.A.O.A. Technical Memorandum No. 760
the.. structural design, characterize the aerodynamic quali-
ty and:afford serviceable comparative data for-power ab-
sorbed and power required. As the comparison here pertains
to a group of similar airplane types employed for the same
purposes and of similar design and construction, which were
subjected to the same tests, the comparison should at least
be useful for .statistical considerations. Moreover, the
comparison will have to be limited to the speed trials be-
cause in these alone the element of chance is to some ex-o
tent absent, even though the personal factor helps in de-
ciding the performance of the airplane. The results of
previous contests have been included.
One of the first questions to decide was, the line of
attack followed to meet the maximum speed requirements,
that is, the auxiliary means with which it was at all possi-
ble to increase the maximum speed vmax.
The contributing factors in vmax* are the power
loading G/N and the wing power N!F. Figure 21 shows
vmax plotted against G/N for ,the majority of this year's
race entries, as well as those of previous contests, for
which the requirements and structural problems were at
least very similar, if not exactly the same. The shape
of the two boundary curves for the aerodynamic quality fac-
tor kl (1050-1700) discloses the law according to which
the power loading of an airplane must be reduced, in order
to insure higher maximum speed without altering the aero-
dynamic quality (k1 = constant). Thus the numerically
higher k defines the higher aerodynamic figure of mer-
it. In the same manner as in past years of the contest,
*According to the initial conditions for level flight at
constant height (thrust = drag) vmax is dependent on the
power loading G/N and unaffected by changes relative to
the size of the wing area. The equation is:
Vmax = 75 N (
The division of aerodynamic and weight factors gives:
vmax = k1 * j. Factor k1 contains, aside from the pro-
peller efficiency q, the value a) , that is, the
best lift/drag ratio, and determines in first approxima-
tion the aerodynamic quality.
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Schulz, R. & Pleines, W. Technical Aspects of the 1934 International Touring Competition (Rundflug), report, December 1934; (https://digital.library.unt.edu/ark:/67531/metadc63467/m1/17/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.