Hybrid Surf Leash Structure for Low-Drag Tangle Prevention
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Solution Overview
Problem
Traditional surf and foil leashes made of single materials like polyurethane or bungee (Dyneema) face issues such as tangling, excessive drag, noise, and safety hazards during falls, which affect the performance and enjoyment of water sports.
Innovation Solution
A hybrid leash combining polyurethane and bungee (Dyneema) sections with swivels to prevent tangling and a coiled section to keep the leash away from the feet, providing optimal stretch and lightness for safer and quieter rides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single-material leash (polyurethane or bungee) is used, then the leash provides continuous connection and retention, but it causes tangling, excessive drag, and noise during water sports
Solution Approach 1:
The leash is divided into three distinct segments: a coiled section (50-70% of total length), a stretch section (20-40% of total length), and a connection section. Each segment performs a specific function - the coiled section prevents tangling and reduces drag, the stretch section provides shock absorption, and the connection section secures the board. This segmentation resolves the contradiction by allowing each part to optimize its performance without the negative effects affecting the whole system.
Solution Approach 2:
The leash incorporates dynamic elements including a coiled section that can expand and contract, and a stretch section with elastic properties. The coiled section dynamically adjusts its configuration to prevent tangling while maintaining connection, and the stretch section dynamically absorbs shock loads during falls or sudden movements. This dynamic behavior eliminates the static limitations of traditional single-material leashes that cause tangling and excessive drag.
2Length of moving object
If a coiled leash is used, then the leash keeps the board within reach, but it binds and tangles upon itself during use
Solution Approach 1:
The coiled section is separated from the stretch section by a swivel connection point. This segmentation allows the coiled section to maintain its length for board reach while the swivel prevents the coil from binding and tangling with the rest of the leash system. The coiled section can freely expand and contract without affecting the stability of the overall leash configuration.
Solution Approach 2:
A swivel connection acts as an intermediary between the coiled section and the stretch section. This swivel allows relative rotation between the two sections, preventing the coiled section from binding and tangling with the stretch section during use. The swivel maintains the functional length of the leash while eliminating the tangling problem associated with coiled leashes.
3Reliability
If a straight stretchy leash is used, then the leash provides shock absorption during falls, but it creates excessive drag and noise in the water
Solution Approach 1:
The leash separates the shock absorption function (stretch section) from the water-contact function (coiled section). The coiled section, which contacts the water during riding, is designed to minimize drag and noise through its coiled configuration. The stretch section, which provides fall protection, is positioned away from the water during normal riding. This segmentation allows each section to optimize its performance without the harmful effects of the other.
Solution Approach 2:
The coiled section dynamically adjusts its configuration based on water conditions and leash tension. During normal riding, the coil maintains a compact shape that minimizes drag and noise. During falls or sudden loads, the coil dynamically extends to work with the stretch section for shock absorption. This dynamic behavior provides fall protection while minimizing drag and noise during normal use.
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 hybrid leash reduces drag, prevents tangling, and minimizes noise, enhancing the riding experience by ensuring the leash remains out of the water and avoiding sharp jolts during falls.
Implementation Method 1
a coiled section (50-70% of total leash length) that keeps the leash away from the feet
Implementation Method 2
a straight stretchy section (20-40% of total leash length) made of bungee material... provides optimal stretch
Implementation Method 3
Because of the swivels, the leash does not bind or tangle
Data Source
AI summary
A hybrid surf leash has a board attachment section, a body attachment section, and a leash section comprising a coiled portion and a straight, stretchy portion. Each of these parts are connected to each other by a swivel, which prevents the leash from tangling or binding on itself. The coiled portion keeps the leash taught, such that it doesn't catch debris in the water, or end up under the user's feet. A preferred embodiment has the straight, stretching portion by a Bungee/Dyneema style cord. The body attachment section can be a belt or vest clip, or a cuff attached to a wrist, calf or ankle.