Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1990-11-27
1993-04-27
Swinehart, Edwin L.
Marine propulsion
Screw propeller
Having means to control flow around propeller
440 38, B63H 1102
Patent
active
052057658
ABSTRACT:
A device, such as a boat hull and propulsion system, for effecting relative movement of a flowable substance, such as water. A channel having open upstream and downstream ends at least partially defines a flow path. The channel includes a fully laterally closed core section distal the upstream end with a fluid moving rotor rotatably mounted therein and a transition section extending forward from the upstream end of the core section. The channel configuration and rotor are adapted to permit a continual decrease in the transverse cross-sectional area of the flow path downstream along the transition section. If the device is a boat hull, the bow is configured to cause gas lubrication thereof by interaction with the water in motion. The transition sections of the channels may be open-bottomed, and ribs are provided to house drive shafts extending downwardly to the rotors. The bow provides lift, and downwardly facing surfaces adjacent the stern are inclined to balance this lift, so that the boat can rise on the water with an upward translating type movement. The rotors themselves are also improved.
REFERENCES:
patent: 1667561 (1928-04-01), Mediavilla
patent: 2630094 (1953-03-01), Hacker
patent: 2812738 (1957-11-01), Munro
patent: 3138130 (1964-06-01), Morgan
patent: 3367423 (1968-02-01), Van Ranst
patent: 3438350 (1969-04-01), Gallin
patent: 4505684 (1985-03-01), Holden et al.
Swinehart Edwin L.
The Pinnacle Corporation
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