Measurement of Visibility From the Pilot's Cockpit on Different Airplane Types Page: 3 of 24
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2 '.A.C.A. Technical M1emorandum No. 646
ical data, to know' to what degree and in what direction
visibility is necessary for a given purpose.
At" the present time, the predetermination of visibil-
ity in new construction i-s largely guesswork based on the
results of experiments with previously built airplanes,
and on' the use of mock-ups. It often happens that the vis-
ibility is neglected for the sake of other structural ad-
vantages, without this error being discovered by practical
flight tests. It is also evident that, with such a haphaz-
ard method, the views on the excellence of the visibility
may differ greatly even among specialists. For all these
reasons, it seems opportune.to determine the visibility on
airplanes in as simple and exact a. anner as possible.
The purpose of this problem is to develop methods
and avoaratus for the measurement of visibW ity and to in-
vostigate the possibility of the representation and numer-
ical determination of visibility.
The methods, as well as the apparatus required for the
measurements, .should to as simple as possible to use and
should enable the representation of the visibility without
much com-utation. The determination of the visibility, by
means of the apparatus, must be possible on existing air-
planes, as well as on mock-ups. The..representation of the
test results should be easily understandable. Furthermore,
it should be possible for the purchaser of an airplane to
express his particular desires regarding visibility with
sufficient accuracy by means of charts and numerical val-
ues. On the othor hand, the manufacturer should be given
the aeans of representing the visibility in a simplified
manner by means of charts or numerical data.
The utility of the developed methods and apparatus
had .to be tested by visibility measurementss on different
typos of airplanes. Moreover, the minimum requirements
for visibility, as well as the judgment of the excellence
of the visibility, had to be established by comparison of
the experimental results with practical flight tests.
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Kurz, Gerhard. Measurement of Visibility From the Pilot's Cockpit on Different Airplane Types, report, November 1931; (digital.library.unt.edu/ark:/67531/metadc277430/m1/3/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.