Patent ID: 7510451
Filing Date: 2009-03-31
Classification: F02B,F02M

Abstract:
1. A watercraft comprising: a hull; an outboard motor mounted to the hull and having a cowling, the cowling housing an engine and an induction system, the cowling defining a completely closed space around the engine such that cooling air within the closed space is convectively heated by the engine; a duct passing through the cowling and having an inlet and an outlet, the inlet being disposed within the hull and the outlet being connected to the induction system such that air ingested by the engine comes solely from the hull; a fan disposed within the cowling and arranged with respect to the engine so as to route engine the cooling air exiting the fan in a first direction and thereby circulate the cooling air within the completely closed space; and a ventilating passage disposed within the cowling and being arranged with respect to the fan so as to route the engine cooling air exiting the fan in a second direction toward the engine so as to transfer thermal energy from the engine, the second direction being opposite to the first direction, wherein the engine cooling air is separate from the air inducted by the engine.