Dual propeller system for marine drive

Details Dual propeller system for marine drive Dual propeller system for marine drive

1996-09-04

1998-06-02

Sotelo, Jesus D.

Marine propulsion

Screw propeller

Propeller arrangement

440 66, B63H 510

Patent

active

057590737

ABSTRACT:
A propulsion system for a marine drive, which includes a pair of counter-rotating propellers, provides improved acceleration from idle or low speeds. Engine exhaust from an engine which powers the marine drive is conveyed to the water about each of the propellers. The exhaust gases aerate the water about each propeller to reduce drag resistance on each propeller. Several embodiments of the propulsion system are disclosed which convey the exhaust gases to both propellers for this purpose.

REFERENCES:
patent: 2099229 (1937-11-01), Possenheim
patent: 3012709 (1961-12-01), Schnell
patent: 3434447 (1969-03-01), Christensen et al.
patent: 4545771 (1985-10-01), Iio
patent: 4793773 (1988-12-01), Kinouchi et al.
patent: 4802872 (1989-02-01), Stanton
patent: 5529520 (1996-06-01), Iwashita et al.

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