Variable-Incidence Hydrofoil Assembly for Shallow Water Safety
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Solution Overview
Problem
Existing hydrofoil systems for waterborne vessels lack adaptability and efficiency in varying water conditions, particularly in shallow waters, where they may experience damage or drag issues due to fixed configurations and lack of automatic retraction mechanisms.
Innovation Solution
A variable-incidence hydrofoil assembly with a support system that allows the hydrofoil to articulate and adjust its lift characteristics, featuring a movable body with a coupling that enables sliding or rotating motion, and an integral control mechanism using sensors and actuators to optimize lift based on altitude and water flow, allowing for automatic retraction in shallow waters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hydrofoils are used, then structural simplicity is maintained, but cavitation occurs at high speeds reducing efficiency
Solution Approach 1:
The hydrofoil is divided into multiple NACA 0012 foil sections arranged in a specific pattern (e.g., 3x3 grid), where each section functions as an independent lifting element. This segmentation allows the hydrofoil to operate efficiently at higher speeds by distributing the hydrodynamic loads across multiple sections, thereby reducing cavitation on individual sections while maintaining overall productivity.
2Productivity
If hydrofoil structure is added to improve speed, then productivity increases, but device complexity increases
Solution Approach 1:
Multiple NACA 0012 foil sections are merged into a single integrated hydrofoil assembly that functions as one unified propulsive device. The sections are positioned at specific angles and orientations to work together, creating a complex structure that achieves high-speed performance while managing the complexity through functional integration rather than separate components.
3Productivity
If conventional foil sections are used, then manufacturing is simple, but drag is high reducing efficiency
Solution Approach 1:
Each NACA 0012 foil section within the hydrofoil assembly is oriented at a specific local angle and position tailored to its location in the overall structure. This local quality optimization allows each section to operate in its ideal flow regime, minimizing drag on individual sections while contributing to overall high efficiency. The angular orientation and spacing of sections are specifically designed to reduce wake interference and form drag.
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 hydrofoil assembly enhances vessel performance by reducing drag, improving safety through automatic retraction in shallow waters, and simplifying construction and maintenance with an integral control mechanism, while being adaptable to different water conditions and compatible with existing vessels.
Implementation Method 1
The hydrofoil may comprise a plurality of NACA 0012 foil sections
Implementation Method 2
The hydrofoil may be hollow to provide buoyancy for the vessel
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
A hydrofoil assembly for a waterborne vessel, comprising: a body; a hydrofoil mounted to the body; the hydrofoil being adjustable to vary its life characteristics; and a control mechanism operative to control the adjustment of the hydrofoil assembly relative to the support.