Bi-directional Surfboard Fin System with Pivoting Mechanism
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Solution Overview
Problem
Surfboards are uni-directional, limiting surfers to perform maneuvers only in one direction due to fin instability when spun 180 degrees, as existing attempts at bi-directional designs have compromised performance or required significant changes in surfing dynamics.
Innovation Solution
A bi-directional surfboard with fin assemblies mounted on the undersurface, capable of pivoting between deployed and stowed positions using hydrodynamic forces and spring mechanisms, allowing fins to stabilize the board in cross-currents without destabilizing it when reversed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fins are fixed at the rear of the surfboard to provide lateral traction and stability, then the board is stable when moving forward, but the fins dig into the water and destabilize the board when the surfer spins it 180 degrees to move backward
Solution Approach 1:
The fins are made movable rather than fixed, allowing them to pivot between a deployed position (perpendicular to the board) for stability during forward movement and a stowed position (parallel to the board) to prevent water resistance during backward movement. This dynamic adjustment resolves the contradiction by adapting fin configuration to the direction of travel.
Solution Approach 2:
The fin system is divided into multiple independent fin assemblies (typically four) positioned at each corner of the board, with each fin capable of independent pivoting. This segmentation allows selective deployment and stowing of individual fins based on board orientation and maneuver requirements.
2Adaptability or versatility
If fins are made retractable into the surfboard to enable bi-directional movement, then the board can move forward and backward, but the board performance decreases and surfing dynamics are substantially altered
Solution Approach 1:
The fins pivot on a horizontal axis allowing them to rotate between deployed and stowed positions rather than retracting completely into the board. This maintains fin accessibility and effectiveness while enabling bi-directional movement, preserving board performance.
Solution Approach 2:
The fin assemblies incorporate spring mechanisms that automatically return fins to their neutral or stowed position after deployment, and hydrodynamic forces from water flow assist in deploying fins when needed. This automatic operation maintains performance without requiring manual intervention that would alter surfing dynamics.
3Adaptability or versatility
If the fin size is reduced to minimize water resistance during backward movement, then the board can move backward more easily, but the fin effectiveness in providing lateral traction during forward movement is compromised
Solution Approach 1:
The fins maintain their full size and shape for maximum lateral traction when deployed, but can pivot to a stowed position parallel to the board during backward movement to minimize water resistance. The dynamic positioning allows full fin effectiveness to be preserved when needed while reducing drag when not needed.
Solution Approach 2:
The fins are periodically deployed and stowed based on the surfing maneuver requirements - deployed during forward movement for lateral traction, stowed during backward movement to reduce resistance. This periodic adjustment optimizes both forward and backward performance.
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
Enables high-performance bi-directional surfing without altering the surfing style, maintaining stability and allowing for aerial maneuvers on large waves with compact, lightweight fin assemblies.
Implementation Method 1
when water flows past each fin in a chordwise direction from an end of the body distal that fin toward an end of the body proximate that fin, hydrodynamic force biases that fin toward the deployed position
Implementation Method 2
each fin assembly comprises a biasing mechanism biasing each fin toward the stowed position so that each fin tends to return to the stowed position when no water flows past each fin
Data Source
AI summary
Disclosed is a bi-directional watercraft, such as a surfboard, fin systems therefore, and method of use. Example fin systems may allow a user of the watercraft to perform bi-directional maneuvers and stunts. The watercraft may be bi-directionally symmetric or asymmetric with fins mounted on its undersurface on both ends. When underway, the fins at the operating rear of the watercraft deploy for stabilization in cross-currents, while the fins at the operating front remain pivoted out of the way so that they do not “catch” water and destabilize the watercraft. When the watercraft reverses in direction, and the front and rear ends swap with one another, biasing mechanisms cause the fins now at the front to pivot away and hydrodynamic forces cause the fins now at the rear to deploy. In some cases, holders keep the fins from inadvertently deploying when they are not needed.