Boat propulsion system

Details Boat propulsion system Boat propulsion system

1974-05-16

1976-01-27

Blix, Trygve M.

Ships

Building

Canal and ferry boats

114 16G, 115 12R, B63H 516

Patent

active

039345386

ABSTRACT:
A boat propulsion system having a downwardly-facing, openbottomed recess at the front of a circumferentially-enclosed propellor which accelerates the inlet water flow to the propellor without, however, requiring the water to change direction abruptly. A venturi throat just behind the propellor causes water to be drawn into the slipstream through auxiliary passages. A valve in the propellor discharge passage may be closed, so as to cause the water displaced by the propellor to flow through the auxiliary passages to produce a reverse thrust on the boat. Either auxiliary passage may be closed selectively. Arcuate rudders pivoted on opposite sides of the back end on the propellor discharge passage control the steering.

REFERENCES:
patent: 2812738 (1957-11-01), Munro
patent: 3306046 (1967-02-01), Trapp
patent: 3513798 (1970-05-01), Dow
patent: 3744446 (1973-07-01), Gibbins
patent: 3793980 (1974-02-01), Sherman
patent: 3823684 (1974-07-01), Baggs

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