Propeller for varying the exhaust length

Details Propeller for varying the exhaust length Propeller for varying the exhaust length

1997-07-15

1998-10-06

Swinehart, Ed L.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

440900, 416 93A, B63H 2132

Patent

active

058168699

ABSTRACT:
A propeller for a marine propulsion system that provides variable length exhaust paths depending upon the speed of the boat and motor. The propeller includes a propeller hub and an exhaust tube positioned within the propeller hub. The exhaust tube extends past the aft end of the propeller hub and defines a first exhaust passageway. A second exhaust passageway is positioned between the propeller hub and the exhaust tube. The second exhaust passageway is shorter than the first exhaust passageway. At low speeds, engine exhaust exits the longer first passageway, while at moderate speeds, engine exhaust exits the shorter second passageway. Therefore, the effective length of the exhaust path varies depending upon the speed of the motor, such that the length of the exhaust path is specifically tuned to several speeds of the motor.

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patent: 5470263 (1995-11-01), Griffiths et al.
patent: 5527195 (1996-06-01), Neisen

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