Lift and drag characteristics of a cabin monoplane Page: 7 of 22
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6 N.A.C.A. Technical Note No. 362
In addition to the dynamic pressure, the data required for
a determination of V/nD and thrust were air temperature, static
pressure, and propeller r.p.s. The air temperature was measured
with a stem thermometer attached to a wing strut. The static
air pressure was determined with an N.A.C.A. recording altimeter,
which is a recording aneroid unit, or by means of visual obser-
vations of the indicating altimeter with which the airplane was
regularly equipped. The propeller r.p.s. was determined from
visual observations of the engine tachometer. All of these
instruments were calibrated.
The accuracy of the flight-path-angle and air-speed re-
corder was investigated in flight. The alignment of this
instrument with respect to the relative wind, which establishes
a reference for the inclinometer element, was determined within
limits of 1,10 by means of level flight runs. The accuracy of
the air-speed element was checked by means -of timed flights over
a measured course. The accuracy with which true dynamic pressure
was established in these flights was within about .1 per cent.
The air-speed element was found to be accurate within these lim-
its. The above values refer only to The consistent errors in
the instrument, however, and not to the accidental errors which
are indicated by a dispersion of experimental points. The
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Thompson, F L & Keister, P H. Lift and drag characteristics of a cabin monoplane, report, January 1, 1931; (digital.library.unt.edu/ark:/67531/metadc54038/m1/7/: accessed March 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.