What is that system that produces thrust to push a ship across water? the answer is marine propulsion system. The design of the system is simple. It is connected to a propeller shaft that drives either propeller or other systems. It is the size of the vessel and type of operation, based on which the propulsion system set-up depends. Most common marine propulsion system is diesel propulsion system that converts mechanical energy from thermal forces. This system can be used in almost all types of vessels, in addition to recreational vessels and small boats.