ABOUT two years ago—early in 1928—rumours first began to circulate that the Packard Company had built a successful air‐cooled radial Diesel engine which had satisfactorily completed flight tests.
(1930), "The Packard Diesel Engine: A Detailed Description Bringing out the Main Features, with some Criticisms", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 7, pp. 163-183. https://doi.org/10.1108/eb029285
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