End cap for guiding an exhaust gas flow of a boat engine, propeller system for a boat engine, boat engine, and use of an end cap and method for guiding an exhaust gas flow of a boat engine

An end cap for guiding an exhaust gas flow of a boat engine, wherein the end cap is configured to be attached onto a propeller nut of the boat engine, the end cap comprising:

• a base body having a bottom surface, a lateral surface and a tip, the tip and the bottom surface being spaced apart from each other in a longitudinal direction of the base body;
• wherein the lateral surface extends from the bottom surface and converges in the tip;
• the bottom surface having a recess for receiving the propeller nut;
• at least one exhaust gas-guiding structure extends helically along the lateral surface;
• and
• the recess is configured as a blind hole having an outer first receiving section and an inner second receiving section, the second receiving section is configured deeper than the first receiving section and has a hexagonal outer circumference.