Passive air induction system for boats

Details Passive air induction system for boats Passive air induction system for boats

2007-02-13

2009-08-18

Avila, Stephen (Department: 3617)

Marine propulsion

Screw propeller

Having means to control flow around propeller

Reexamination Certificate

active

07575490

ABSTRACT:
A passive air induction system for boats that includes a wedge member and air induction tubes. The system is installed within the propeller tunnel of high-speed planing vessels to reduce or eliminate noise and vibration caused by cavitation vortices created by rotation of the propeller blades. The air induction tubes include air inlets that receive ambient air, which is delivered to the wedge member to be released from a plurality of distribution slots on the wedge member as air bubbles. The air bubbles released from the distribution slots provide a cushioning effect against contact between the cavitation vortices and the vessel hull, thereby reducing vibration and noise that has been heretofore common at high speeds in planing vessels.

REFERENCES:
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patent: 6045420 (2000-04-01), Small et al.
patent: 6193573 (2001-02-01), Small
patent: 6213824 (2001-04-01), Small
patent: 6406341 (2002-06-01), Morejohn

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