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Alexeyev KM Ekranoplan (Caspian Sea Monster) - In the early 1960s, Rostislav Alexeyev and the Soviet Union experimented with ekranoplan (wing-in-ground effect) vehicles. This work led to the KM (Korabl Maket), the longest and heaviest aircraft of its time.

Alexeyev SM-6 and A-90 Orlyonok Ekranoplans - The A-90 Orlyonok was an ekranoplan (wing-in-ground effect) vehicle designed by Rostislav Alexeyev in the Soviet Union. Three production machines were built and served with the Soviet Navy in the 1980s.

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.

Fairbanks Morse Diamond Opposed-Piston Marine Engine - The Fairbanks Morse Diamond opposed-piston engine was an experimental project during WWII. Sponsored by the US Navy, the engine produced 3,000 hp, but only one prototype was built.

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).

Isotta Fraschini W-18 Aircraft and Marine Engines - In the 1920s and 1930s, Isotta Fraschini developed the Asso 750 and Asso 1000 W-18 aircraft engines. Although used in a number of aircraft, the engine found a much longer life in marine applications.

Lun-class / Spasatel Ekranoplans - The Soviet Lun-class ekranoplan was a missile-carrying, fast-attack craft built in the late 1980s. Only one machine was completed, but attempts were made to convert the design for Search and Rescue service.

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.

Napier Deltic Opposed-Piston Diesel Engine - The Napier Deltic was a two-stroke, opposed-piston diesel engine with three cylinder banks arranged in a triangle. The engine was developed in the 1950s for marine and locomotive use, and it is still used today.

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.