Fairbanks Morse 28/33D STC engine

The Fairbanks Morse 28/33D STC is a four-stroke medium-speed marine diesel engine built and sold by Fairbanks Morse Defense in 12, 16 and 20 cylinder V arrangements, produced under licence from the German designer MAN Energy Solutions, now called Everllence. The bore is 280 millimetres and the stroke 330 millimetres, giving 20.3 litres per cylinder. The maker lists a power range of 5,460 to 10,000 kilowatts, with the ferry rating at 1,000 revolutions a minute and the navy rating at 1,032, and calls it the most powerful and fuel-efficient 1,000 rpm diesel engine in the world. A 52 degree vee angle keeps the engine narrow, and sequential turbocharging with an electronically controlled injection system improves fuel consumption and response. Everllence's project guide describes the design as simple and functional, with low acoustic and thermal signature, and the engine is aimed at naval and ferry propulsion.