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2. Marine propulsion - Wikipedia

   en.wikipedia.org/wiki/Marine_propulsion

   A pump-jet, hydrojet, water jet, or jet drive uses a ducted propeller (axial-flow pump), centrifugal pump, or mixed flow pump to create a jet of water for propulsion. These incorporate an intake for source water and a nozzle to direct its flow out, generating momentum, and in most cases, employing thrust vectoring to steer the craft.

3. Direct-drive mechanism - Wikipedia

   en.wikipedia.org/wiki/Direct-drive_mechanism

   Direct-drive systems are characterized by smooth torque transmission, and nearly-zero backlash. [9] [10] [11] The main [citation needed] benefits of a direct-drive system are increased efficiency (due to reduced power losses from the drivetrain components) and being a simpler design with fewer moving parts.

4. Mackerel-class submarine - Wikipedia

   en.wikipedia.org/wiki/Mackerel-class_submarine

   For the Mackerels, two somewhat different designs were produced by the Electric Boat Company and Portsmouth Navy Yard. [8] As prototypes, Mackerel and Marlin were near-sisters rather than sisters. References agree that Mackerel used a direct drive propulsion arrangement, but differ as to whether Marlin had direct drive or diesel-electric drive.

5. Motorboat - Wikipedia

   en.wikipedia.org/wiki/Motorboat

   There are two configurations of an inboard, V-drive and direct drive. A direct drive has the powerplant mounted near the middle of the boat with the propeller shaft straight out the back, where a V-drive has the powerplant mounted in the back of the boat facing backwards having the shaft go towards the front of the boat then making a V towards ...

6. Marine steam engine - Wikipedia

   en.wikipedia.org/wiki/Marine_steam_engine

   The result was the growing dominance of the so-called "vertical" engine [25] (more correctly known as the vertical inverted direct acting engine). In this type of engine, the cylinders are located directly above the crankshaft, with the piston rod/connecting rod assemblies forming a more or less straight line between the two. [ 25 ]

7. Parsons Marine Steam Turbine Company - Wikipedia

   en.wikipedia.org/wiki/Parsons_Marine_Steam...

   Four direct-drive Parsons turbines powered battleship USS Arizona. They were designed to produce a total of 34,000 horsepower (25,000 kW), but achieved only 33,376 horsepower (24,888 kW) in Arizona ' s sea trials, when she met her designed speed of 21 knots (39 km/h). [4]