shortboard concave in detail

Now that’s one way of dealing with entry rocker, seen em before but crap the light just when on! Looks wicked to shape. Guessin’ at the fin cants 7 front 3 rear OPS been runnin’ 7 and 5 will take it that there is a reason. Mahalo for the share! Dig it…

PS How does the C-5 set up work?

Aloha!

I would say the Gemini rear fins are straight up and straight, no cant, no tilt. It’s a setup I like a lot. That’s one board with a single concave that doesn’t have that strange feeling. But, the Gemini’s don’t have the kind of single concave that other boards have, it more like a big channel running down the board with a nice wide flatter section on the rails that slowly gets smaller, like a hydrofoil racing boat.

That orange and red board was the first single concave I used that I didn’t like. I think that one needed to be on the rail at all times.

oneula posted some detailed shots and OPS is greatful, just a poor old guy lookin’ to skip a few steps!

Your first comment alarmed me,  my insecure side questioned if this was a waste. Had to reinforce this idea (again). However, Procter seems to be on the something  i.e. “Pipsqueek” (riden truster). 

Both “beta boards “where quads only” and boards don’t get enought testing. Point is, just got test report (surf good & thinkin’ the single concave) Hell no! the applewood “thang” and he’s stoked because he tried it truster for the first time, " like a different board”.

Maybe the fin set up WTF?

Eh thankz

OPS, I only rode the orange red board a handful of times, but I rode it in headhigh to overhead nice clean “town” waves. I found it felt strange when I was not turning, like after turns in the transition, or if the white water catches you. That was the worst, when you get back into the whitewater a little. I think it would be fine in clean water. The guy that made that board specializes in North Shore boards, so it might have been better in juicier waves. I think that was an 8-0 and my brother sold it before I had a chance to destroy it.

We still have about 5 or 6 Geminis between the 2 of us. I have one he just gave me towards the end of the year that hasn’t been in the water yet, I think it’s that blue and green one, and another from a friend and that hasn’t been wet yet either. When I first rode the Gemini, my friends would laugh and make fun of the shape, but it’s a great design.

Thank you SC “your words have iron” (Outlaw Josey Wales)

OPS rode a 8’-6" “surfdefect Rusty” same color hated the piece of crap.

Very much in your debt for you having the balls to jump in here and I truly value it.

OPS not getting’ any younger and just pissed with the double concave thruster, my God it’s been over a least 19 years!

OPS sponge suck up ideas and digest.

ever since Jeff moved to Bali the Gemini’s are hard to get.

the only other’s I know who are actively making them are Jack’s son, Jon Lalanne(Lala Surfboards) and Jim Dunlop over in Florida. Seen a Glenn Miyasaki copy here once as well. It’s a really well thought out design from the reverse outline to the twin noses and special quad set up. The concave starts deep and flattens towards the tail, kind of how Maurice flattens out his tail area so the flow is across the flats diagnally. Very much a bar of soap once you insert the airbubble underneath but no real top end because of that.kind of like having a turbo when you need it versus a supercharger. Jon explains allot about it on his YouTube video. " like riding on two 16" wide thrusters" something BK was experimenting with in the early 60’s and opposite our what people typically do with concaves such as simmions with his wide tailed twins…I left that Spiderman one with George Gall at PlusOne as a thank you present and something to learn from. Hit him up if you want to try one.

focusing and streamlining waterflow in the most efficient manner to increase either planing speed or control is what every great shaper I know seems to be obsessed with other than making a name for them selves and earning a comfortable living with the hype they create from that…

Thanks Big.

Not sure if he still has the info on his website, but Jeff said that the Gemini has shorter board tail curve for turning and longer board nose curve. Then he cut off the nose of the board about 6-8 inches. the 2 points are to allow air to get under the board, but to also to keep the air from holding up the nose since it’s a wide nose. He also credits hydrofoil racing boats as an inspiration. They are meant to be ridden very short. There’s a handful of guy in Hawaii who ride these and they tear. It’s fast and maneuverable, and the quad setup has tons of hold. That’s why I like this fin setup, it has a very solid feel. Not like quads that are all out on the rail. Kinda like the hold of a thruster, but the speed of the quad.

I have not tried single concave boards like what Maurice Cole is doing.

I like having a slight bit of concave under the nose of my mid-lengths. I think it helps on the smaller days, or when you make your top turn a little late and you get hung up at the top. Just step up on the nose and it will shift into another gear, and get you going.

Thanks for the replies,

   Some interesting pics too,  Im going to keep my eyes open and a straight edge close at hand for checking every concave I can get my hands on, unfortunately at the moment I don’t really have time to experiment much but hopefully next month I can make a couple of boards and explore the ‘concave channel theory?’ in more detail,  keeping the concave as straight as possible down through the board (i.e not taking it all the way out to the rails at the wide point.   I should mention as well that I will incorporate a slight double concave at the front fins fading out through the tail…  Just personal preference.

 

  My gut tells me that it will be faster, but I’m not sure how its going to affect turning