Napier Deltic engine

The Napier Deltic engine is a British opposed-piston valveless, supercharged uniflow scavenged, two-stroke diesel engine used in marine and locomotive applications, designed and produced by D. Napier & Son. ....and here's its gear train.


The Napier Nomad two-stroke diesel turbo-compound - about 3,000hp, and still, I believe, one of the best specific fuel consumption aero-engines ever built, by unknown.