Marine propulsion device including propeller shroud

Details Marine propulsion device including propeller shroud Marine propulsion device including propeller shroud

1979-06-28

1981-12-08

Kazenske, Edward R.

Marine propulsion

Screw propeller

Having means to control flow around propeller

440 89, B63H 116, B63H 2132

Patent

active

043045588

ABSTRACT:
The marine propulsion device includes a lower unit normally submerged in water, a propeller carried by the lower unit, and an annular shroud surrounding the propeller blades and defining a passageway through which water flows. The shroud, which can be in the form of a Kort-type nozzle for augmenting propeller thrust, has a trailing edge located rearwardly of the travel path of the propeller blade tips. The trailing edge of the shroud includes an annular recess through which either engine exhaust gases or atmospheric air is delivered to ventilate the low pressure area created behind the trailing edge of the shroud during forward movement of the lower unit through water.

REFERENCES:
patent: 2030375 (1936-02-01), Kort
patent: 2860594 (1958-11-01), Kiekhaefer
patent: 2983246 (1961-05-01), Manley
patent: 3149605 (1964-09-01), Broadwell
patent: 3209534 (1965-10-01), Stallman
patent: 3249083 (1966-05-01), Irgens
patent: 3434447 (1969-03-01), Christensen et al.
patent: 3476070 (1969-11-01), Austen
patent: 3494320 (1970-02-01), Stubblefield
patent: 3499412 (1970-03-01), Anthes et al.
patent: 3508517 (1970-04-01), Hannon
patent: 3624737 (1971-11-01), Keller
patent: 3943876 (1976-03-01), Kiekhaefer
patent: 3968944 (1976-07-01), Zimmer et al.
patent: 4096819 (1978-06-01), Evinrude

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