Boat propeller having counter-rotating screws and provided with

Details Boat propeller having counter-rotating screws and provided with Boat propeller having counter-rotating screws and provided with

1988-07-01

1989-05-23

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Ambient fluid or exhaust gas directed through hub, fairing...

416129, 416189, 415 68, 440 67, B63H 510

Patent

active

048325708

ABSTRACT:
A screw propeller (10) for boats includes two counter-rotating screws (12, 16) coaxial with an annular nozzle (20). The aft screw (16) has a smaller diameter than the forward screw (12) and the nozzle (20) has an annular duct (B) situated upstream of the rear screw (16) and arranged to discharge the exhaust gases from the engine.

REFERENCES:
patent: 2672115 (1954-03-01), Conover
patent: 3109495 (1963-11-01), Lang
patent: 3112610 (1963-12-01), Jerger
patent: 3499412 (1970-03-01), Anthes et al.
patent: 4304558 (1981-12-01), Holterman
patent: 4324985 (1982-04-01), Oman
patent: 4422820 (1983-12-01), Kirsch et al.
patent: 4619584 (1986-10-01), Brandt
patent: 4637801 (1987-01-01), Schultz

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