Abstract: A propulsion system for a large watercraft, e.g., for a high-speed, military surface craft, includes at least one water jet propulsion device (water jet) beneath the vessel. An operating method of such a system includes propulsive energy by combustion engines, e.g., gas turbines, and distributing the exhaust gases created by the combustion engines beneath the vessel in the water by the use of water flow of the water jet system. In such a method, the water flow speed of the water jet system is adjusted in accordance with the requirements of exhaust gas discharge and distribution.

Abstract: A method and apparatus are provided for enhancing the internal combustion engine performance, particularly the performance of charged diesel engines for charging batteries for submarines in snorkel running, whereby the exhaust gasses generated by the internal combustion engines during snorkel running are introduced into the water that surrounds the submarine, and whereby a reduced water pressure is created in at least one region at the submarine via flow-oriented measures by way of the motion of the submarine through the surrounding water, and the exhaust gasses are introduced into this region, for which purpose mechanically actuated flow-directing elements are arranged at the submarine.