Custom fin for a custom SUP

thingiverse

A year ago, I built a 12' SUP as a hovercraft frame but changed my mind about the design. Now, I have a great SUP for myself, and it worked out perfectly since I was planning to buy another one for my wife. We tested it at a lake this weekend, and it performed well except for the lack of a fin. To solve that problem, I designed a fin that attaches without a fin box, which I will epoxy/screw onto my SUP. After testing its strength in an acetone vapor chamber and sanding aggressively, I believe the trailing edge should be sharper. This fin is ideal for those who don't have a fin box and need a fin. As a non-expert in fluid dynamics and surfing, I aimed for decent performance. The fin works best with one large fin and no cant, making it unsuitable for 2-fin or 3-fin (thruster) setups due to its perpendicular design. It's an excellent choice for stable, fast boards suitable for beginners.