Surfboard Overlap Seal for Inflatable Hull Drive Unit
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Solution Overview
Problem
Existing surfboards with inflatable hull components and drive units experience increased water resistance and compromised form-fitting connections due to water ingress into the gap between the hull and the drive unit, especially at high speeds.
Innovation Solution
The surfboard incorporates an underwater surface overlap on the hull component that covers the gap between the hull and the drive unit, reducing water ingress and enhancing the form-fitting connection by directing water flow along the surface and potentially creating a suction effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive unit is inserted into the rear-end recess of the inflatable hull component, then the form-fitting connection provides secure mounting, but water ingress into the gap increases water resistance and loosens the connection at high speeds
Solution Approach 1:
A waterproof membrane is introduced as an intermediary element between the drive unit and the inflatable hull component. This membrane covers the gap between the two components, preventing water from entering the recess while allowing the drive unit to maintain its form-fitting connection. The membrane acts as a barrier that mediates between the need for a secure connection and the need to prevent water ingress.
Solution Approach 2:
The waterproof membrane is implemented as a flexible thin film that conforms to the shape of the gap between the drive unit and the inflatable hull component. This flexible film adapts to the contours of the components while maintaining water tightness, allowing the system to prevent water ingress without compromising the form-fitting connection or adding significant structural complexity.
2Strength
If the hull component is inflated to provide structural support, then the surfboard gains buoyancy and stability, but the inflatable material yields under water pressure allowing water penetration into the gap
Solution Approach 1:
The waterproof membrane serves as a mediator between the inflatable hull component and the external water environment. It allows the hull to remain inflatable for structural support and buoyancy while preventing water from penetrating into the recess area, as the membrane bears the water pressure instead of the inflatable material yielding.
Solution Approach 2:
The hull structure is segmented into the inflatable component and the waterproof membrane layer. This segmentation allows the inflatable portion to provide structural support and buoyancy while the separate membrane layer handles the water pressure prevention, preventing water penetration without compromising the inflatable structure's strength.
3Reliability
If the gap between hull and drive unit is minimized for a tight fit, then the form-fitting connection is improved, but manufacturing precision requirements increase and assembly becomes more difficult
Solution Approach 1:
The waterproof membrane provides a flexible sealing solution that accommodates variations in manufacturing tolerances. Instead of requiring extremely precise manufacturing to eliminate the gap completely, the flexible membrane can conform to slight variations in the gap size while still providing effective water protection, thus reducing manufacturing precision requirements.
Solution Approach 2:
The membrane acts as an intermediary that compensates for manufacturing tolerances. It fills and seals the gap between the drive unit and hull component, allowing for greater manufacturing flexibility while maintaining the reliability of the form-fitting connection and preventing water ingress.
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 overlap effectively minimizes water penetration into the gap, reducing water resistance and maintaining a secure connection between the hull and the drive unit, even at high speeds.
Implementation Method 1
the overlap has the function of preventing the water flowing along the underwater surface of the surfboard from entering the gap while the boat is in motion, but is instead directed along the underwater surface over the gap
Implementation Method 2
in addition, a slight suction effect can occur at the open end of the overlap, which even sucks out some of the water in the gap
Data Source
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AI summary
The invention relates to a surfboard with an inflatable hull component (2) with a rear-side receptacle (4), a drive unit (3) which fits positively into the rear-side receptacle (4), a gap (6) on the underwater surface side between the hull component (2) and the drive unit (3), wherein an overlap (8) is arranged on an underwater surface (7) of the hull component (2), which overlap covers the gap (6) at least in sections.