Air encircling marine propulsion apparatus

Details Air encircling marine propulsion apparatus Air encircling marine propulsion apparatus

1996-01-05

1996-12-31

Sotelo, Jesus D.

Marine propulsion

Screw propeller

Having means to control flow around propeller

440 66, 416189, B63H 116

Patent

active

055888860

ABSTRACT:
An air encircled marine thruster apparatus for a bow or stern thruster includes an outer pipe or duct that surrounds a first pipe carrying a propulsive stream of water to provide an annular blanket of air around the stream. An inner surface of the first pipe is shaped to radially converge at an outlet of the first pipe to form a nozzle. The outer pipe is larger then the first pipe to provide an annular space around the first pipe and propulsive stream exiting the first pipe. A duct leads air into the annular space to form a blanket of air around the propulsive stream, which increases the thrust produced by the propulsive stream.

REFERENCES:
patent: 4304558 (1981-12-01), Holtermann
patent: 4370096 (1983-01-01), Church
patent: 5482482 (1996-01-01), Davis
Act, Inc., Marine Propulsion Division, Orlando Fl., Pump Jet Technology For Outboard Motors, 5 pages.

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