Name a common type of main engine used in very large cargo ships that typically operates at low RPM and directly drives the propeller.

The common type of main engine used in very large cargo ships that typically operates at low RPM and directly drives the propeller is a slow-speed two-stroke marine diesel engine. This engine is specifically engineered for the high power and continuous operation demands of massive vessels. The term slow-speed refers to the engine's operational characteristic of turning at a low number of revolutions per minute (RPM), typically ranging from 60 to 120 RPM. This low speed is vital because it enables the engine's crankshaft to di....