Rotatable Center Fin Assembly for Water Sports Board Steering
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Solution Overview
Problem
Existing water sports boards, such as surfboards, lack effective mechanisms for the rider to control the center fin during maneuvers, leading to reduced maneuverability and increased directional friction, resulting in loss of speed and control during turns.
Innovation Solution
A rotatable center fin assembly with a tiller mechanism that allows the rider to control the center fin by applying force through a flexible, hinged tiller connected to a two-piece rotatable shaft, enabling controlled rotation of the center fin for improved steering and turning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the center fin is made fixed to the board, then the board structure is simple and stable, but the rider cannot control the fin angle during maneuvers, resulting in loss of speed and control during turns
Solution Approach 1:
The center fin is changed from a fixed structure to a rotatable structure that can dynamically adjust its angle. The fin rotates about a vertical axis within a fin box, allowing the rider to change the fin angle during maneuvers to maintain optimal performance and control while turning.
Solution Approach 2:
A tiller mechanism is introduced as an intermediary device between the rider and the center fin. The tiller connects to the rotatable shaft that controls the fin angle, allowing the rider to manipulate the fin from the top surface of the board without direct contact with the fin itself.
2Speed
If the rider applies force to change center fin angle during turns, then maneuverability is improved, but directional friction increases causing loss of speed
Solution Approach 1:
The dynamic adjustment of center fin angle allows the rider to optimize the fin's orientation relative to the direction of travel during turns. By adjusting the fin angle to match the turn radius and speed, the board maintains better hydrodynamic efficiency, reducing directional friction and speed loss during maneuvers.
3Ease of operation
If a rotatable shaft mechanism is installed through the board, then center fin control is enabled, but the board structure becomes more complex and requires additional components
Solution Approach 1:
The rotatable shaft mechanism serves multiple functions: it provides the rotational connection for the center fin, acts as the control linkage from the tiller, and defines the vertical axis of rotation within the fin box. This multi-functionality reduces the need for separate components and simplifies the overall structure despite enabling complex fin control.
Data Source
AI summary
A water sports board, such as a surf board, is described which has a rider operated center fin that is rotatably mounted on the lower side of the board which aids in steering the board. The central fin is rotatably moved by a center fin assembly that includes a driving mechanism such as a tiller or arm secured to a rotatable shaft passing through the board that is secured to the rotatable central fin. The rider uses his or her rear foot to apply a force to the tiller or arm which moves the tiller and in turn moves the center fin so as to steer the board.