Full set of Jimmy Quad Fins.
If you only look at them for a second, the Jimmy Quad fins from Hawaiian fin company Chubbies look a lot like keel fins. Round with almost no rake. Kinda like classic fish or mini simmons templates- except more vertical. But when you look a little closer, you notice they’re probably the most foiled fins you’ve ever seen, and they’re not just a little vertical- they’re pretty damn upright, not to mention crazy thick.
The extremely foiled insides and the absence of rake cause a tremendous amount of lift and reduces drag. The thickest point is extra thick which makes the foiling seem even more dramatic. Having this heavy contrast and cambered design generates serious drive through the tail and a ton of dynamic water flow under your feet.
View of inside foiling on Jimmy Quad fronts as compared to a regular flat foil.
Considering there’s essentially no sweep to these fins, they offer a ton of hold. As a midweight surfer (150-160lbs,) I can safely say the Jimmy Quads from Chubbies could be used in the biggest waves around without worrying about spinning out or losing grip.
If you’re not going to be surfing large or especially powerful surf, the Jimmy Quad set provides some options. I tried running just the quad fronts with Chubbies prototype 50/50 foiled center trailer. With this setup I was able to throw pretty tight, close together hacks and even though there was a lot of hold, the setup maintained drivey, with heavy speed as if I was surfing a much looser setup.
Jimmy Quad rear and front next to an AM-2 fin.
On that note, I also tried running the quad fronts alone- as a straight up twin- on a fishy board in smallish waves. This setup increased my overall drive even more, but there was also suddenly more drift in my turns- especially compared to the high level of hold the Jimmy Quads had given previously. I liked this feel though, and it was still way less drift than I’m used to on even a dedicated twin fin setup. The Jimmy Quad fronts actually worked very well as a stand alone twin set.
Jimmy Quad set with Chubbies prototype center stabilizer.
Diagram of Chubbies fin foiling. Photo: Chubbies.
For more info, check out the Chubbies Surf Fins website