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Brayton Ready Motor Hydrocarbon Engine - George Brayton was a pioneer of the internal combustion engine and built commercially available engines starting in 1872. However, his constant-pressure cycle engines were outperformed by later engines.
Duesenberg 12-Cylinder Marine Engine and the Disturber IV - First run in 1914, James Pugh’s Disturber IV was powered by two straight 12-cylinder engines built by the Duesenberg brothers. Each engine displaced 3,221 cu in (52.8 L) and produced 800 hp (597 kW).
Duesenberg W-24 Marine Engine - In 1925, Horace Dodge Jr contracted the Duesenberg brothers to build an engine for his Gold Cup race boat. Plagued with issues, the engine would not find glory until 1937 and with a different owner.
General Motors / Electro-Motive 16-184 Diesel Engine - The General Motors / Electro-Motive 16-184 was a vertical X-16 marine engine that produced 1,200 hp (895 kW). Because of its stacked cylinder configuration, it was nicknamed a pancake engine.
Idroscivolanti and the Raid Pavia-Venezia - In the 1930s, Idroscivolanti (Italian for airboats) powered by aircraft engines raced in the 269-mile (433-km) Raid Pavia-Venezia and reached speeds up to 80 mph (128 km/h).
MAN Double-Acting Diesel Marine Engines - In the first half of the 20th century, MAN (Maschinenfabrik Augsburg-Nürnberg) developed a number of double-acting, two-stroke, diesel, marine engines, including a V-24 that displaced 224,957 cu in (3,686 L).
Mercedes-Benz 500 Series Diesel Marine Engines - The Mercedes-Benz MB 500 series diesel marine engines evolved from the Daimler-Benz DB 602 aviation engine and were first built in the 1930s. Some versions of MB 500 series are still in use today.
Michel Opposed-Piston Diesel Engines - Starting in the 1920s, German engineer Hermann Michel designed a series of opposed-piston engines. Michel’s ultimate design was an engine in which three pistons converged in a common combustion chamber.
Miller 1,113 cu in V-16 Marine Engine - Harry Miller built two 1,113 cu in (18.25 L), supercharged, V-16 marine engines for Gar Wood in 1931. For a time, the 1,800 hp (1,342 kW) engines were installed in the Miss America VIII speedboat.
Timossi-Verga Laura 3 Hydroplane - Italian Mario Verga had the Laura 3 hydroplane built for an attempt on the World Water Speed Record. While the boat, with its two Alfa Romeo Typo 159 engines, had the speed, the attempt ended in disaster.
Versuchs Schnellboot 5 (VS 5) Semi-submersible Attack Boat - Versuchs Schnellboot 5 (VS 5) was a semi-submersible ship designed by Rudolf Engelmann to achieve high speeds and be stable through rough seas. The VS 5 was built in Germany during World War II.
Yakovlev M-501 and Zvezda M503 and M504 Diesel Engines - One of the largest aircraft engines ever built, the 42-cylinder Yakovlev M-501 was modified into the Zvezda M503 marine engine. A further redesign created the 56-cylinder Zvezda M504.