The knock-limited power at various blend compositions for several aromatics and cycloparaffins individually blended with paraffinic base stocks, as determined in an air-cooled aircraft engine cylinder at fuel-air ratios of 0.07 and 0,10 is presented. An analysis of the data leads to the conclusion that the extended reciprocal blending relation suggested in a previous NACA report is not generally applicable to such nonparaffihic components, but might possibly be useful as an approximation over a limited range of composition for aromatic blends.
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