Surfboard Fin Angle Offset for Adjustable Toe-In Tuning

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Solution Overview

Problem

Existing surfboard fins lack the ability to be tuned for toe angle, limiting the board's performance adjustment to different surf conditions.

Innovation Solution

A fin design with a modified profile that allows for adjustable toe-in or toe-out angles by altering the angle of attack relative to the mounting axis, enabling customizable surfboard performance post-manufacture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If fins are made generic and fixed in the board, then manufacturing is simple and reliable, but the ability to tune the board for different surf conditions is limited

Engineering Contradiction:

Improvetuning capabilityVSAvoidfin design complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The fin is segmented into distinct functional zones: a mounting portion with a first profile for structural attachment, and a fin portion with a second profile for hydrodynamic performance. This segmentation allows independent optimization of mounting characteristics and fin characteristics, enabling tuning capability without compromising manufacturing simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fin employs asymmetric profiles where the fin portion differs from the mounting portion. The fin portion has a cambered cross-section with a windward face and leeward face, while the mounting portion has a different profile optimized for attachment. This asymmetry enables the fin to provide both secure mounting and optimized hydrodynamic performance.

Inventive Principle:

Principle #4Asymmetry

2Adaptability or versatility

If fins are made removable for tuning, then adaptability improves, but manufacturing precision and reliability deteriorate

Engineering Contradiction:

Improvetuning capabilityVSAvoidmounting precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The fin includes a pre-formed mounting portion with a first profile that is specifically designed for precise engagement with the surfboard fin box. This preliminary preparation of the mounting interface ensures accurate positioning and secure attachment, maintaining manufacturing precision while enabling removability for tuning purposes.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250333141A1Surfboard fin and method for use thereof

Publication Date: 2025.10.30 CAMERON NEAL

AI summary

A surfboard fin having mounting elements (95) for removably attaching the fin to a fin box of a surfboard may have an angle of attack (110) that is defined by a line from the leading edge (92) to the trailing edge (94) of the fin. The angle of attack (110) may be offset from a mounting axis (112) defined through the mounting elements of the fin. The offset enables a surfboard to be tuned to create directional performance characteristics for the surfboard.