Editing Straight-twin engine (section)

== Usage in marine vessels ==
[[File:Easthope Marine Engine.jpg|thumb|Easthope marine engine, circa 1960]]
Straight-twin engines have been often used as [[inboard motor]]s, [[outboard motor]]s and [[jet pump]] motors.<ref name="JetVee" />

In the early 20th century, gaff-rigged British fishing boats such as Morecambe Bay Prawners[[Nobby (boat)#Lancashire nobby|Lancashire Nobbys]] would sometimes retrofit an inboard engine, such as the Lister or the ''[[Kelvin Diesels|Kelvin]] E2'' 3.0 litre petrol-paraffin engine.

From the 1950s, manufacturers of outboard motors had settled on the use of the basic inline engine design, cylinders stacked on top of each other with the crankshaft driving the [[propeller shaft]]. The ''Suzuki 15'' outbound motor was introduced in 1989.<ref name="PopMechFeb1989" />
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