Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels 2: Investigation of Leaded Paraffinic Fuels in an Air-Cooled Cylinder Page: 2 of 31
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
EXPERIMENTAL STUDIES OF THE KNOCK-LIMITED BLENDING
CHARACTERISTICS OF AVIATION FUELS
II - INVESTIGATION OF LEADED PARAFFINIC FUELS
IN AN AIR-COOLED CYLINDER
By Jerrold D. Wear and Newell D. Sanders
The relation between knock limit and blend composition of
selected aviation fuel components individually blended with
virgin base and with alkylate was determined in a full-scale
air-cooled aircraft-engine cylinder.- In addition the follow-
ing correlations were examined:
(a) The knock-limited performance of a full-scale engine at
lean-mixture operation plotted against the knock-limited perform-
ance of the engine at rich-mixture operation for a series of
(b) The knock-limited performance of a full-scale engine at
rich-mixture operation plotted against the knuck-limited perform-
ance at rich-mixture operation of a small-scale engine for a
series of fuels
In each case the following methods of specifying the knock-
limited performance of the engine were investigated:
(1) Knock-limited indicated mean effective prossure
(2) Percentage of S-4 plus 4 ml TEL per gallon in M-4 plus
4 ml TEL per gallon to give an equal knock-limited indicated mean
(3) Ratio of indicated mean effective pressure of test fuel
to indicated mean effective pressure of clear S-4 reference fuel,
all other conditions being the same.
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Wear, Jerrold D. & Sanders, Newell D. Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels 2: Investigation of Leaded Paraffinic Fuels in an Air-Cooled Cylinder, report, July 1947; (digital.library.unt.edu/ark:/67531/metadc55425/m1/2/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.