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Napiers became involved in marine engine production in the early 1900's when 1903 SF Edge had a 40'all-steel hulled vessel constructeed to compete in the Harmsworth Trophy. Napier, as it was appropriatey named, was fitted with a big four-cylinder engine giving 80 HP at 800 rpm.  


Later the Napier Lion engine was marinised as the Sealion and used during the war in high speed MTBs and ASR vessels.  Napier purpose built marine engine was the Deltic compression ignition engine.  This came into existence after the war due to the high incidence of fires on board the petrol fueled high speed boats.


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