Analysis of Wind-Tunnel Stability and Control Tests in Terms of Flying Qualities in Full-Scale Airplanes Page: 3 of 60
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accelerations, angles, and other measurable items - which
actually define the stability and control characteristics
of an airplane in flight.
Various means may be employed for determining from
wind-tunnel test data the particular dimensional values
describing the airplane's flying qualities, but this type
of analysis has not generally been considered the province
of wind-tunnel personnel. -It is believed, however, that
the value of wind-tunnel tests would be increased con-
siderably if an analysis of this nature were included in
every stability and control investigation. Although the
analysis would augment rather than replace the measured
data as usually presented, the greater portion of the
wind-tunnel report would consist of a discussion of the
actual flying qualities of the airplane. The inclusion- - ---
of such a discussion would eliminate the confusion often
caused by merely presenting the test results, facilitate
the practical application of tunnel data, and provide
assurance that no flight difficulties will pass undetected
because of failure to put the accumulated information to
its proper use. In addition, test programs designed for
this purpose could be planned more efficiently with regard
to the amount of required testing. Many programs in the
past have been laid out arbitrarily without a complete
understanding of the manner in which the resulting data
should be applied. This lack of understanding has at
times resulted in insufficient data concerning trim condi-
tions and considerable unnecessary data for untrimmed
The purpose of this paper is to outline a suggested
form of presentation of the results of a stability and
control investigation in terms of flying qualities as de-
fined in reference 1 and to systematize and review
briefly the analytical work required for this type of
presentation. No effort is made to specify definite test
Reference 2 contains a review of testing techniaue
for use with powered wind-tunnel models and a fairly
complete discussion of most of the standard tests neces-
sary for the accumulation of data used in the suggested
analysis. It should. prove useful in the preparation of
any stability and control test program. Although flight
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Kayten, Gerald G. Analysis of Wind-Tunnel Stability and Control Tests in Terms of Flying Qualities in Full-Scale Airplanes, report, October 1943; (https://digital.library.unt.edu/ark:/67531/metadc279513/m1/3/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.