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THE Deltic diesel engine, developed during the past few years in England by Napier is now in quantity production. The Deltic presents novel design features claimed to achieve a technical advance in current diesel-engine practice. Some special features are discussed in the paper, and a description of the engine, its characteristics and performance is included. The general design philosophy behind the Deltic is outlined by the author, and some comments on reliability as applied to high-speed engines are set forth. A survey is made of current applications of the Deltic, and a brief reference is made to future developments.

THE Nomad compounded diesel engine described in this paper has been developed by Napier during the past seven years. Resulting from the combination of a diesel engine with a gas turbine, the engine gives lower fuel consumptions than can be obtained from any other type of powerplant and maintains these consumptions over a wide range of aircraft speeds and altitudes. These characteristics, which are still further improved by the ability to use cheap fuels, produce an engine making possible extreme economy for air transport purposes and very long-range operations for either military or civil purposes.