Marine engine - marine engine

Japanese: 舶用機関 - はくようきかん

The engine equipment necessary to propel a ship. In the narrow sense, it refers only to the main engine that drives the propeller shaft. In this case, auxiliary engines, accessories required to operate the main engine, and other equipment are collectively called auxiliary machinery. Today, steam engines are no longer used as main engines; most are steam turbines or diesel engines. Since either type is installed inside the narrow space inside a ship, it is necessary for them to be small in volume and weight, to be able to withstand rolling and vibration, and to be reliable.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

船を航走させるのに必要な原動機設備。狭義には推進器軸を駆動する主機だけをさし，この場合，補助原動機や主機運転に必要な付属機器，その他の機器類を一括して補機と呼ぶ。主機には，今日では蒸気機関は使われず，蒸気タービン，ディーゼルエンジンがほとんどである。いずれも狭い船内に設けるため，体積・重量が小さく，動揺・振動に耐え，信頼性の高いことなどが必要。

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