Analysis of information sources in references of the Wikipedia article "Napier Deltic" in English language version.
Powering H.M. fast patrol boat Dark Hunter, launched on March 18th, is a Napier Deltic engine. An opposed-piston two-stroke diesel, it develops 2,500 hp (1,900 kW); its power/weight ratio 4.2 lb/hp (2.6 kg/kW) is said to be the highest ever achieved in a marine diesel.