Vessel with exhaust through bottom.

摘要

A high speed vessel, the main exhaust b of which opens through the bottom, comprises a duct 12 leading forward from the exhaust opening to enable exhaust gases quickly to fill a recess 2 to provide lift and lower water resistance. The recess 2 is divided into a shallow portion (21) and a deep portion (22). A groove 14 is provided around the periphery of the vessel's bottom to trap exhaust gases. A triangular water flow guide 20 of trapezium-like vertical section is positioned forward of a propeller to divert the flow of aerated water which would otherwise lead to a reduction in the propeller's efficiency.