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Foreign Research Progress: Translations Issued by the N.A.C.A.

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 1 July 1945



The coefficient of friction between piston ring and cylinder wall (both average coefficient and coefficient at different points over the stroke) was measured on a test set‐up in relation to rubbing speed, wall pressure and temperature, increase in running‐in time, oil quantity, and type of oil. The average friction coefficients fluctuated between 0·02 and 0·14 and, for the same oil samples and test conditions at medium and high wall pressures, was much greater than the friction coefficients of a well‐oiled journal bearing.


(1945), "Foreign Research Progress: Translations Issued by the N.A.C.A.", Aircraft Engineering and Aerospace Technology, Vol. 17 No. 7, pp. 208-208.




Copyright © 1945, MCB UP Limited

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