The Use of Multiplied Pressures for Automatic Altitude Adjustments Page: 2 of 10
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL NOTE NO. 108.
THE USE OF MULTIPLIED PRESSURES FOR AUTOMATIC
By Stanwood W. Sparrow.
The efficient performance of an airplane requires that cer-
..in adjustments be made as the density of the air through which
the airplane passes, becomes changed. Hence, there is the "alti-
cade control" of the carburetor which enables &he pilot to main-
tain the desired air-fuel ratio, Recent developments have in-
creased both the number and importance of such adjustn.ents. For
example, the safety of the over-dimensioned engine depends upon
careful manipulation of spark advance and throttle opening and
a proper control of a variable pitch propeller, if the maximum
performance of the supercharged engine is to be obtained. It is
evident that there is a real need for eatisfactory devices to
make such adjustments automatically. The following discussion
deals with a method of automatic compensation which deserves, but
never to the writer's knowledge has received, consideration in
the design of such devices.
Prior to this discussion a few remarks Concerning existing
Schemes for automatic compensation seem desirable. The majority
zf these schemes depend upon some contrivance which functions
. 'imarily because of changes in atmospheric pressure. Though
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Sparrow, Stanwood S. The Use of Multiplied Pressures for Automatic Altitude Adjustments, report, August 1922; (digital.library.unt.edu/ark:/67531/metadc53798/m1/2/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.