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Exhaust for outboard jet propulsion engine

a technology of exhaust pipe and jet propulsion engine, which is applied in the direction of marine propulsion, waterborne vessels, vessel construction, etc., can solve the problems of water jet exiting the plenum, reducing the effective power of the engine, and losing power, etc., so as to achieve the effect of power and the effect of power

Inactive Publication Date: 2007-08-02
SWORD MARINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it suffers from the disadvantage that power is lost when the engine is required to make tight turns in the reverse direction; particularly in the type of movements required by a tugboat, i.e., tight quick turns under high power.
During tight maneuvers, one of plenums 22 became blocked by the structure of the boat, reducing the effective power of the engine.
Additionally, water jets exiting plenums 22 quickly lost their cohesion and in effect their power.
Furthermore, it was discovered that the gas exhaust from the engine housed within the jet propulsion housing was producing bubbles as it exited the housing, which was interfering the optimal operation of the jet engine as a result of cavitation.

Method used

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  • Exhaust for outboard jet propulsion engine
  • Exhaust for outboard jet propulsion engine
  • Exhaust for outboard jet propulsion engine

Examples

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Embodiment Construction

[0029] Reference is made to FIGS. 1B, 2B, 3B and 4B in which a bucket assembly, generally indicated as 100, is shown. Bucket assembly 100 includes a bucket housing 104. A bucket 102 is rotatably mounted on bucket housing 104. Bucket housing 104 is in communication with a water exhaust of the jet propulsion engine so as to receive water existing the water exhaust (not shown). Bucket housing 104 has an entrance port 106 and a first exhaust 108 (FIG. 7), seen at an opposed end of housing 104 for allowing water to exit bucket housing 104 when bucket 102 is in the open position.

[0030] An exhaust assembly, generally indicated as 110, provides a second exhaust. The exhaust assembly 110 has a first vent 112 and a second vent 114. Vent 112 extends along a first axis and vent 114 extends along a second access so that the first axis intersects the second axis, i.e. vent 114 is angled relative to vent 112. When bucket 102 blocks water from exiting exhaust 108, it also places vents 114, 112 are...

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Abstract

An outboard jet drive marine system for a boat comprises a bucket assembly adapted to be mounted to a jet drive unit for receiving a water exhaust from a jet drive unit. The bucket assembly has a bucket housing. The bucket housing has a first exhaust, and at least a second exhaust. The second exhaust directs the water jet in a direction towards and beneath the boat. The bucket housing has an entrance port for receiving said water exhaust. A bucket is rotatably mounted on the bucket housing at the first exhaust and is rotatable relative to the first exhaust between an open position and a closed position. The bucket deflects water entering the entrance port to the at least a second exhaust when in a closed position.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This Application is a Non-Prov of Prov (35 USC 119(e)) application of Provisional Application No. 60 / 751,700 filed on Dec. 19, 2005.BACKGROUND OF THE INVENTION [0002] This invention is related to an exhaust for an outboard jet propulsion engine, and in particular, a bucket for exhausting the water jet when driving the associated craft in the reverse direction. [0003] It is known in the art to utilize an outboard jet propulsion engine to drive a boat. As known from applicant's co-pending U.S. application Ser. No. 10 / 988,327, filed Sep. 14, 2005 entitled OUTBOARD JET DRIVE MARINE PROPULSION SYSTEM (the “327 application”) water is driven through a housing, the force of the exiting jet of water moving the boat in the forward direction. A bucket assembly is mounted at the jet exhaust so as to selectively move from a first position to a second position between covering the exhaust and keeping clear of the exhaust. As the bucket assembly cover...

Claims

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Application Information

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IPC IPC(8): B63H11/11
CPCB63H11/11
Inventor LAWSON, WILLIAM
Owner SWORD MARINE TECH