Patent ID: 8808045
Filing Date: 2014-08-19
Classification: B63H,F01N

Abstract:
1. A method for controlling the exit of exhaust gases from an engine, the engine being used to power an underwater propeller drive which is arranged at the hull bottom of a boat, the method comprising letting the exhaust gases flow from the engine through an exhaust channel and exit through a first underwater exhaust outlet in the underwater propeller drive, when the engine is running and the transmission of the propeller drive is in neutral position, opening a second underwater exhaust outlet for letting exhaust gases in the exhaust channel exit in a position closer to the hull bottom of the boat than the first underwater exhaust outlet, wherein a first part of the underwater propeller drive is rotatable about a second part which is attached to the hull bottom of the boat, the exhaust channel comprises a first opening in the first rotatable part which faces a second opening in the second fixed part, the first and second openings having corresponding forms and shapes so as to cooperate to form part of the exhaust channel, and the second underwater exhaust outlet is opened by means of rotating the first rotatable part to a predefined angle relative to the second fixed part.