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In page PT boat:

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Packard's licensed manufacture of the famed Rolls-Royce Merlin aircraft engine alongside the marine 4M-2500 has long been a source of confusion.[1] Only the British-built PT-9 prototype boat brought from England for Elco to examine and copy featured a Merlin. The 4M-2500 initially generated 1,200 hp (890 kW). It was subsequently upgraded in stages to 1,500 hp (1,100 kW), allowing a designed speed of 41 knots (76 km/h). The 5M-2500 introduced in late 1945 had a larger supercharger, aftercooler, and increased power output of 1,850 hp (1,380 kW). It could push fully loaded boats at 45 to 50 knots (83 to 93 km/h).[citation needed] However, subsequent additions of weaponry offset this potential increase in top speed.