Tunnel wedge

Details Tunnel wedge Tunnel wedge

1980-11-20

1986-11-11

Blix, Trygve M.

Marine propulsion

Screw propeller

Having means to control flow around propeller

440 68, 440 69, B63H 516

Patent

active

046220160

ABSTRACT:
A full or partial tunnel wedge is positioned in the propeller shaft tunnel ft of the propeller on a waterborne craft. The size and angle of the wedge is determined by the characteristics of the particular craft. The wedge converges water flow and increases water pressure aft of the propeller. The higher water pressure increases the propeller thrust and reduces the hull drag of the propeller shaft tunnel thus reducing the shaft horsepower required to maintain a given speed.

REFERENCES:
patent: 1108340 (1914-08-01), Criqui
patent: 1163075 (1915-12-01), Fowler
patent: 1401963 (1922-01-01), Criqui
patent: 2812738 (1954-11-01), Munro
patent: 3112610 (1963-12-01), Jerger
patent: 3450090 (1968-03-01), Best, Jr.
patent: 3572281 (1971-03-01), Becker
patent: 3626894 (1970-06-01), Stuart
patent: 3793980 (1974-02-01), Sherman
patent: 3893405 (1975-07-01), Lais et al.
patent: 3934538 (1974-05-01), Canazzi
patent: 3937173 (1974-09-01), Stuart
patent: 4278431 (1981-07-01), Krastkremer et al.
patent: 4300889 (1981-11-01), Wormser

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