Marine Vessel Deceleration Control to Prevent Transom Water Entry

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Solution Overview

Problem

Conventional marine vessels experience water entry into the hull during deceleration, leading to wetting of the interior and passengers due to the wake height exceeding the transom height and horizontal velocity component.

Innovation Solution

A marine vessel maneuvering system with a controller that performs water entry determination and notification controls to prevent water entry by determining the height of the wake relative to the transom and notifying the operator, using sensors for hull position and speed data to adjust maneuvers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the hull is decelerated, then the speed of the marine vessel is reduced, but the height of the wake above the water surface increases and water may enter the hull

Engineering Contradiction:

Improvespeed of the hullVSAvoidwater entry into the hull

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The controller performs water entry determination control before water actually enters the hull by calculating the wake height and comparing it with the transom height during deceleration. This preliminary assessment allows the system to predict and prevent water entry before it occurs, maintaining the deceleration benefit while avoiding the harmful effect.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors hull speed, calculates wake height based on deceleration parameters, and compares it with the transom height in real-time. This feedback mechanism allows dynamic adjustment of deceleration rates or notification to the operator, preventing water entry while maintaining operational efficiency.

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If the controller performs water entry determination control, then water entry is reduced or prevented, but the device complexity increases

Engineering Contradiction:

Improvewater entry into the hullVSAvoidcontroller complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The controller utilizes existing sensor data (speed, position) already available in the marine vessel system to calculate wake height and determine water entry risk. By self-servicing with existing resources rather than adding dedicated sensors or complex external systems, the solution prevents water entry while minimizing additional device complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system replaces complex mechanical water entry prevention structures with computational analysis. Instead of physical barriers or mechanical devices to prevent water entry, the controller uses mathematical calculations based on wake height and transom height comparison, simplifying the overall system while effectively preventing water entry.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12509196B2Marine vessel maneuvering system and marine vessel

Publication Date: 2025.12.30 YAMAHA MOTOR CO LTD

AI summary

A marine vessel maneuvering system includes a controller configured or programmed to perform a water entry determination control to determine whether or not water behind a hull that rises above a water surface due to deceleration of the hull may enter the hull when the hull is decelerating.