I have spent a lot of time on mid-length single-fin performance boards and have worked on several fin designs to optimize how they work. In the end, I refined the sizes down to just two: 7.5” and 8.0”. For 6’6” - 7’6” with pulled-in tails, go with the 7.5” fin. For larger, wider boards in the 6’8” – 8.0” range, then go with the 8.0” fin. They are upright with a lot of base and lend themselves to no-frills power surfing.

The Apex is a newer twin fin I’ve refined to get away from the skatey/fishy feel some twins have, but with the same get up and go. This template is upright at 6.0” and a large 5.4” base, which really helps with stability and predictability through turns. Influenced by Australia’s legendary twin fin pioneers, with refinements for modern board outlines, rails, and bottom contours. Power, speed, and control through turns.

Start off with the Apex Twin set and add a pair of beefy trailers (3.5”H x 3.7” base) and you have this quad set built for power surfing quad mid-lengths and hipro longboards. You can take this quad set into serious surf and get max-hold and drive and incredible speed down the line and through turns.

Add these beefy (3.5”H x 3.7” base) trailers to your twin setup for extra drive and stability. If you already have a set of Apex Twins, add these trailers, and you’ll have my Quartet Quad set up as an option.

The Duo blends variables of single fins and twin fins and produces a smooth, deep drive unlike anything else I have ridden. I have been refining these fins since 2015, with the concept of creating greater hold and release than a single fin with the speed of a twin. If you’re building a board, the twin center boxes are set 7.0” apart and 7.25” up from the tail with 4 degrees of cant and no toe. You can also use a single DUO with small side bites for a very drivey 2+1 set.

I’ve been working on these side bites with the Duo setup for a while now, with an interest in added hold, and drive out of the second half of the turn, working perfectly with the Duo fin set up and adding more bite and release. If you’re building a board for a Duo fin set up, add the single plugs for the Duozer side bites and you can ride your board with or without the sidies.

This is a keel fin set with my performance upgrades. 5.5” height with foiling for speed and outline for solid turns, particularly on the backside. Works great with wider twinnies for down the line performance, enhanced hold in more critical surf, and improved turning manners.