Marine Hull Drag Control for Quiet Drift Fishing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drift fishing methods face issues with fishing line entanglement due to differing movements between the hull and fishing line caused by tidal currents and wind, and conventional technologies either require frequent propulsion device use or manual operation of resistance members, making them unsuitable for quiet and easy drift fishing.
Innovation Solution
A control device for marine vessels with independently adjustable water resistance bodies on the hull, controlled by a controller to maintain a relative distance and orientation with a freely drifting buoy, minimizing wind effect and reducing the need for manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a buoy with a shape designed to be less susceptible to wind floats on water and the vessel is maneuvered to follow the buoy, then the vessel moves along with the tidal current making drift fishing easier, but frequent use of a propulsion device is required resulting in reduced quietness
Solution Approach 1:
The water resistance bodies are designed to be movable between different positions (first position with adjustable resistance to first magnitude, and second position with resistance adjusted to zero or second magnitude smaller than the first magnitude). This dynamic adjustment allows the system to adapt to varying conditions, enabling the vessel to follow the buoy with minimal propulsion device use, thereby maintaining quietness while facilitating drift fishing operation.
2Stability of the object's composition
If a resistance member such as a sea anchor is submerged in water enabling the hull to be more strongly affected by the tidal current than by the wind, then the hull moves with the fishing line, but manual operation is required making it not easy to maneuver
Solution Approach 1:
The controller automatically controls the water resistance bodies based on the relative distance between the buoy and the hull, without requiring manual operation. The system self-adjusts the resistance bodies to maintain optimal positioning, enabling the hull to move consistently with the fishing line while eliminating the need for manual intervention, thus improving maneuverability.
3Object-generated harmful factors
If the pair of water resistance bodies are controlled based on the relative distance between the buoy and the hull, then the hull moves primarily with tidal currents reducing propulsion device use, but the control system complexity increases
Solution Approach 1:
The controller acquires the relative distance between the buoy and the hull and uses this feedback information to automatically adjust the water resistance bodies. This feedback mechanism enables the system to maintain optimal positioning and reduce propulsion device use while managing control complexity through automated distance-based control logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and quiet drift fishing by maintaining the hull's movement primarily with tidal currents, reducing entanglement and propulsion device use, while ensuring a comfortable fishing environment.
Implementation Method 1
a pair of water resistance bodies (93L, 93R), and a controller (70). The pair of water resistance bodies (93L, 93R) are provided on the hull (2), one on a left side and one on a right of the hull (2), each independently movable between a first position in which a resistance received from water in a predetermined direction is adjustable to a first magnitude, and a second position in which a resistance is adjustable to zero or to a second magnitude smaller than the first magnitude
Data Source
AI summary
A control device for a marine vessel includes a hull, a pair of water resistance bodies, and a controller. The pair of water resistance bodies are provided on the hull, one on a left side and one on a right side of the hull, each independently movable between a first position in which a resistance received from water in a predetermined direction is adjustable to a first magnitude, and a second position in which a resistance is adjustable to zero or to a second magnitude smaller than the first magnitude. The controller is configured or programmed to acquire a relative distance between a buoy, which floats on the water in a free-drifting manner, and the hull. The controller is configured or programmed to control the pair of water resistance bodies based on the relative distance.