Assisted Foil Watercraft Propulsion System
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Solution Overview
Problem
Existing hydrofoil watercraft require significant effort to reach the threshold speed, as the propulsion systems are continuously engaged, leading to increased drag and energy expenditure, making it difficult for users to transition from displacement to foiling mode efficiently.
Innovation Solution
A propulsion system integrated with the hull that engages the water when in displacement mode and disengages when in foiling mode, utilizing a rechargeable power source and sensors to automatically deactivate when the threshold speed is reached, allowing for transient supplemental propulsive force to assist in exceeding the threshold speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the propulsion system is continuously engaged to reach threshold speed, then the watercraft can overcome drag and reach foiling speed, but energy expenditure and drag increase significantly
Solution Approach 1:
The propulsion system operates periodically rather than continuously - engaging only during the displacement mode phase to reach threshold speed, then disengaging during foiling mode. This periodic operation reduces energy expenditure while still achieving the necessary threshold speed for hydrofoil lift.
Solution Approach 2:
The system dynamically transitions between two operational states: propulsion engaged during displacement mode and propulsion disengaged during foiling mode. This dynamic adaptation allows the system to optimize energy usage by matching propulsion activation to the specific operational phase.
2Duration of action of moving object
If the propulsion system is continuously engaged, then the watercraft can maintain movement, but drag from hull displacement increases energy consumption
Solution Approach 1:
The propulsion system switches between engaged and disengaged states based on operational mode. During foiling mode, when the hydrofoil generates lift and reduces drag, the propulsion system disengages, eliminating continuous energy loss to hull drag while maintaining forward motion.
Solution Approach 2:
The harmful element of continuous propulsion engagement that causes energy loss is extracted by disabling the propulsion system during foiling mode. The system removes the unnecessary energy consumption component while retaining the beneficial hydrofoil lift effect.
3Productivity
If the propulsion system provides transient supplemental propulsive force, then the watercraft can exceed threshold speed more efficiently, but requires automatic deactivation control
Solution Approach 1:
The automatic control system uses feedback from sensors detecting operational mode (displacement vs. foiling) to control propulsion system activation. This feedback mechanism enables efficient transient propulsion assistance while automating the deactivation process based on real-time system state.
Solution Approach 2:
The propulsion system automatically manages its own operation through integrated sensors and control logic that detect when threshold speed is reached and autonomously deactivate propulsion, eliminating the need for manual intervention while optimizing efficiency.
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
Reduces the energy required to reach and maintain the threshold speed, enhancing efficiency by minimizing continuous propulsion system engagement and leveraging environmental conditions for sustained speed, such as wind and waves.
Implementation Method 1
a hydrofoil configured to suspend the hull above a water surface when a threshold speed is exceeded
Implementation Method 2
a propulsion system integrated with the hull that engages the water when the watercraft is in a displacement mode
Data Source
AI summary
A hydrofoil watercraft has propulsion system integrated with the hull that engages the water when the watercraft is in a displacement mode. The propulsion system is disengaged from the water when the hull is in foiling mode. The propulsion system may automatically deactivate when the watercraft transitions from the displacement mode to the foiling mode.