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Speed measurements made by Division "A" of the airplane directorThe various speeds of an airplane can only be measured in horizontal flight, since there are no means for measuring the angle of ascent or descent. The measurements must be corrected for the density of the air. This is obtained by simultaneous pressure and temperature measurements during flight. Calculation from the mean yearly values in accordance with Everling's suggestion can only be considered an approximation, since the distribution of pressure and temperature in the individual strata at different altitudes undergoes such large variations that the yearly mean gives inaccurate values. Thermographs of the present form are useless for temperature measurements of an airplane. In altitude data, the following are to be distinguished: the height above the earth, the barometric altitude, and the altitude corresponding to the yearly mean air density. Variometers are not suited for the mechanical control of high altitude flight.
Document ID
19930081071
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Heidelberg, V
Hoelzel, A
Date Acquired
September 6, 2013
Publication Date
July 1, 1923
Report/Patent Number
NACA-TN-147
Accession Number
93R10361
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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