Fin Setup Questions

I’m Pretty much an idiot novice on anything regarding board building as I pretty much just enjoy riding them so I’d like to pose this set of questions to you swaylock guru’s.

I’ve ridden just about every fin design that’s come out so I’m curious about this layout I use on my Gemini and I now see that Jeff Clark is using on his Mavericks guns.

It’s a four fin setup where the two front fins are toed in and canted out but the back two fin are fairly close to each other and pointed straight ahead. On my Gemini I use the Futures 3/2 double foiled fins up front and a set of 420 sides in the back. I haven’t had much success with any other futures up front (twin or fiberglass AM). But now I read that Jeff is using four full foiled fins instead of side fins. Since I’e never ridden such a fin setup on any other board I can’t now tell if it’s the fin setup or board design of the gemini thats giving me the positive vibe.

Based on Jeff’s commitment to this fin setup at big mavericks I’m now thinking that it’s probably the concave bottom and the fins that maybe responsible for the speed and the stickness and not the twin nose concave scoop…

Comments/Analysis?

Secondly, the previous other speed demon post my 5-fin Rawson Bonzer experience was with a little full concave bottom C-5 that George Ku made. But now I see boards coming out with the small canards on the inside and not on the outside of the side fins. The owner said it helps bring the board around off the top in a carve and not as a pivot. So this has me boggled as well as all the C5s and twinzers I’ve seen have the smaller fin on the outside close to the rail and not closer to stringer…

Anyway both these setups seem to have the same attempt at putting fins on the inside straight ahead close to the stringer…

Also I don’t understand four fully(back?) foiled fins versus using four side fins in a quad setup. Maybe there’s something here I just don’t see…

Any answers?

My Gemini Fin Setup

Jeff Clark’s Setup

I guess it works for Jeff…

Jeff’s been using it for years. Not all of the better Mavericks regulars are fans, although most of them have tried it.

No concave though - Vee - rolled vee, lots of it, deepening through the tail.

Front fins are single foiled. Back fins double.

Pavel calls it a Canard Quad, and Manny Caro of MandalaCustoms makes them too.

So Blakestah and maybe Halcyon…

What are the two parallel foiled rudders doing to make it any better than a single rudder?

Seems like you’re creating all kinds of vortices and cavitation with two straight fins in the back instead of one. And foiled?

That means you have opposite curved surfaces right next to each other…

The Pavel/Manny Quads use narrower and more vertical back fins than just a nomrmal swept back fin too so I’d think the response would be different…

Do you go with 2 of those new future small hatchet fins instead of a regular side/back fin for this weird setup?