Spiral Tendency in Blind Flying Page: 3 of 32
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N.A.C.A. Technical Note No. 314 2
carried on by the National Advisory Committee for Aeronautics
at Langley Field, Virginia, to determine whether the sane ten-
dency normally appeared in the piloting of aircraft.
Methods and .Apparatus
For the purpose of these experiments, a dual control VE-7
airplane was used. The subject pilot was placed in the front
seat, which was located approximately at the center of gravity
of the airplane. in this position the subject pilot was less
influenced in piloting by the accelerations. A safety pilot,
who also served as observer, occupied the rear seat.
A face mask type of goggles, in which the glasses were re-
placed by light-tight pieces of cardboard and black paint, was
used as a very effective blindfold; they are shown in Figure i.
The subject pilot was usually directed to take off and fly
to some safe altitude at which steady air conditions existed, in
the meantime getting accustomed to the flying qualities of the
airplane. At this point the observer took over the controls,
and the subject pilot assumed the "blind condition" by putting
on the goggles. The airplane was then brought into position
for straightaway flight by the observer and turned over to the
subject pilot, who then attempted to maintain straight flight.
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Carroll, Thomas & McAvoy, William H. Spiral Tendency in Blind Flying, report, August 1929; (digital.library.unt.edu/ark:/67531/metadc54031/m1/3/: accessed February 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.