Single fin placement on pintail mini-gun

Hello,
Working on a new design of a 70s minigun board I want to do with a glassed on single fin. I see lots of talk about round tails and square tails but not much on thinned out pin tails. This board is 6’8”x19.25x2.75”
n: 13.5” t: 11.5” @ 12”
Thinking a 7.5” brewer fin template, wide foil, at what measure up?
I have a 6’4 single with a round tail and the 7” fin is at 6” and it’s a very similar outline tail aside. Any recs on placement?
6” seems really far back for that narrow of tail but maybe that’s just me, need some 70s insight. thanks.

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I don’t have the measurements to hand but this is a 6’10" 70’s board I restored. Sadly it is finless currently … maybe I didn’t do such a great job glassing the fin back on!!!



I am far from a single expert. For me multifins is better but from what i know your rail should allow to have the tip of the smaller fin, you want to use, aligned verticaly to tail end. Most of time impossible because box to high for tail thickness. So i use longer box (10") far back possible then drill a hole for leash corde.

Yes if you are going to do a box you need at least one inch thickness at the rear of the box. If you are going to glass on, it doesn’t matter. Six inches is fine from rear of the fin base to the tailblock. Two small side-bites at 2 1/2–3”will make it a better board. If guys in the 70’s knew what side-bites were, every single fin would have had them. Especially all of those Pipe boards in the 808. I love those small single tab 2 1/2” ones that True Ames makes. I use a Fusion fin box. That gives me some wiggle room to move the fin back or forward.

Oh and that is a nice template. When you are doing a Pin Tail you always have to keep in mind the type of wave you intend to use it in and how often. If I we’re still living in the 808, I’d have at least one in my quiver. Probably a 7’6 or 7’2. Probably about the same outline as yours. If you get them too pinned you can’t turn them off the tail good enough to suit me. No squared off bottom turns, no big a$$ laid out horizontal cutbacks. My preference was always a “Rounded Pin”. A nice in the middle. And when I say rounded pin I am not referring to some fat wide semi circle tail. Rusty P and Bruce Jones had mid six foot rounded pins dialed in as far back as the 1980’s. Early hi-tech thrusters.

I’m definitely going to glass the fin in rather than do a box, I like the look better of glassed in fins, especially on these retro designs!
I have a similar outline in a 7’2” with a wing at 8” up, I run a brewer template 8” fin at 8”-9.5” up from tail and Like the response it gives me there, I’m thinking of meeting the middle ground for this board as I want it to hold in larger hollower surf, so maybe 7.5” up tail to back end of the base. Same brewer template but I’m making it a thick foil. What are your thoughts on that


Updated outline curves

My only comment is that “fat” foils are not my thing and there has got to be some kind of diminishing return for every inch you move forward.

Looks pretty good to me. I made 1000’s of boards all thru the 70’s in hawaii and huntington beach. the problem back then was the rocker. maybe 1" in the tail also thick. 11.5" tail is really gunny depending on where you surf and how large the surf would be… aloha, steve