Back Napier Deltic Czech Napier Deltic German Napier Deltic Spanish موتور مثلثی نپیر Persian Napier Deltic Italian ネイピア デルティック Japanese Napier Deltic Polish Дельтообразный двигатель внутреннего сгорания Russian Napier Deltic SIMPLE Trojuholníkový motor Slovak
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. Unusually, the cylinders were disposed in a three-bank triangle, with a crankshaft at each corner of the triangle.
The term Deltic (meaning "in the form of the Greek letter (capital) delta") is used to refer to both the Deltic E.130 opposed-piston, high-speed diesel engine and the locomotives produced by English Electric using these engines, including its demonstrator locomotive named DELTIC and the production version for British Railways, which designated these as the Class 55.
A single, half-sized, turbocharged Deltic power unit also featured in the English Electric-built Type 2 locomotive, designated as the Class 23. Both locomotive and engine became better known as the "Baby Deltic".