Jet propulsion system, jet-propelled boat, and hull launching method

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The jet propulsion system addresses the challenge of hull launching by oscillating the nozzle to reduce friction, enabling easier trailer launch through controlled nozzle direction changes.

JP2026085290APending Publication Date: 2026-05-25YAMAHA MOTOR CO LTD

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Patent Information

Application Number: JP2024197827
Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner
Filing Date: 2024-11-13
Publication Date: 2026-05-25

Application Information

Patent Timeline

13 Nov 2024

Application

JP2024197827

25 May 2026

Publication

JP2026085290A

IPC: B63H11/08; B63H25/46; B63H21/22

CPC: B63H25/46; B63H11/11; B63H2025/028; B63H11/113; B63H25/02

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Application Domain

Steering initiations Propulsion power plants

Technology Topics

Jet propulsion Classical mechanics

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AI Technical Summary

Technical Problem

Conventional jet propulsion boats face difficulty in launching the hull from a trailer due to frictional resistance, requiring significant labor and time, as simply ejecting a jet water flow forward may not effectively move the hull in the lowering direction.

Method used

A jet propulsion system with a nozzle actuator that oscillates the nozzle to change the direction of the water jet, combined with a control unit for oscillation control, allows the hull to be shifted relative to the trailer, reducing friction during launch.

Benefits of technology

The system facilitates easy launching of the hull from the trailer by oscillating the nozzle, effectively moving the hull in the launching direction and reducing friction, even when forward thrust is insufficient.

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Abstract

The present invention provides a jet propulsion system, a jet-propelled boat, and a boat hull launching method that enable easy launching of the boat hull from a trailer. [Solution] This jet propulsion system 100 includes a jet propulsion mechanism 4 that generates thrust by ejecting a jet of water from the nozzle 44a, which is located at the stern 114 of the hull 110 and includes a nozzle 44 provided with a jet water nozzle 44a, a nozzle actuator 5a that rotates the nozzle 44 to change the direction of the jet water from the nozzle 44a, and a control unit 8 that performs oscillation control by repeatedly oscillating the nozzle 44 using the nozzle actuator 5a when lowering the hull 110 from the trailer T.

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