Motorboat propeller

Details Motorboat propeller Motorboat propeller

1990-08-17

1992-01-07

Sotelo, Jesus D.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

416201R, 440 81, B63H 2132

Patent

active

050786326

ABSTRACT:
To reduce engine exhaust gas pressure behind a motorboat propeller formed with a boss for educing engine exhaust gas therethrough, without forming a trumpet-shaped boss end and without allowing exhaust gas to flow upstream along the boss outer surface, a single or plural small subblades are provided between two adjacent large main blades at such a position that a positive pressure domain produced by the subblade reduces a negative pressure domain produced by the main blade. Since engine exhaust gas can be effectively educed, engine power increases and therefore motorboat acceleration performance can be improved.

REFERENCES:
patent: 3520270 (1970-07-01), Miller

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