Hydrofoil Hull Retreat Surface for Impact Absorption
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Solution Overview
Problem
Hydrofoil crafts face instability and risk of collision with obstacles during foilborne state, leading to potential interference with the hull due to detachment of the strut from the hydraulic cylinder, causing impact forces to be transmitted directly to the hull.
Innovation Solution
A hydrofoil craft design featuring a hull with an accommodating recess and a retreat surface extending downward from the bottom to the stern side, which can receive and disperse the impact force when the strut and hydrofoil detach or tilt, reducing the influence on the hull.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hydrofoil mechanism operates in foilborne state at high speed, then the craft achieves higher speed and efficiency, but the strut may detach from the hydraulic cylinder and collide with the hull, causing harmful impact forces
Solution Approach 1:
The patent applies beforehand cushioning by creating a recessed accommodating space in the hull bottom where the strut can be received if it detaches during high-speed operation. This pre-designed space acts as a cushioning zone that absorbs impact forces before they can reach the main hull structure, thereby protecting the hull from harmful impacts while allowing high-speed foilborne operation to proceed
2Strength
If the strut is supported only by the frame after detachment, then the hydraulic cylinder rod is saved from damage, but the strut can turn about the support part and collide with the hull, creating interference with stable operation
Solution Approach 1:
The patent introduces an intermediary structure - the accommodating recess with its specific geometric configuration - that mediates between the detached strut and the hull. This intermediary space receives and constrains the strut's movement, preventing it from rotating about the support part and colliding with the hull, thereby maintaining stable operation while preserving structural integrity
3Object-affected harmful factors
If the accommodating recess is formed in the hull bottom, then the strut can be accommodated and impact forces are reduced, but the hull structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating the accommodating recess only in the specific location where the strut attaches to the hull bottom, rather than modifying the entire hull structure. This localized modification provides the necessary impact absorption and strut accommodation functionality while minimizing the overall complexity of the hull structure, maintaining simplicity where not needed
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
The retreat surface effectively reduces the impact force transmitted to the hull by absorbing and dispersing the force, minimizing the risk of strut and hydrofoil collision with the hull, even when colliding with obstacles, and allowing for early detachment of the strut and hydrofoil to prevent repeated collisions.
Implementation Method 1
A retreat surface 12 is formed between the bottom 13 and a recess main surface 21b facing the bow side in the accommodating recess 2, the retreat surface 12 extending toward the stern side in a downward direction and being connected to the bottom 13
Data Source
AI summary
A hydrofoil craft includes a hull including a bottom that spreads from a bow to a stern; and a hydrofoil mechanism provided on the bow side of the hull. The hull further includes an accommodating recess formed therein, and the accommodating recess is recessed toward the stern side between the bow and the bottom to accommodate the hydrofoil mechanism. A retreat surface is formed between the bottom and a recess main surface facing the bow side in the accommodating recess, and the retreat surface extends toward the stern side in a downward direction and is connected to the bottom.