Noise reducing device for marine propulsion

Details Noise reducing device for marine propulsion Noise reducing device for marine propulsion

1988-04-12

1989-12-19

Fuller, B. R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181229, 181239, 181176, 60312, 440 89, 440900, F01N 106

Patent

active

048876925

ABSTRACT:
A number of embodiments of silencing devices for marine propulsion units using acoustical lenses that are positioned across either the air inlet device, the air exhaust device or both. The acoustical lenses direct the sound waves in such a way so as to effect silencing while, at the same time, ensuring that water will not enter the engine combustion chambers. The invention is shown in conjunction with both outboard motors and inboard mounted engines.

REFERENCES:
patent: 3120876 (1964-02-01), Lirette
patent: 3431882 (1969-03-01), Irgens
patent: 4604069 (1986-08-01), Taguchi
patent: 4734070 (1988-03-01), Wondek
patent: 4753318 (1988-06-01), Mizuno et al.

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