I am making a board (7’8’’ - 21’’ or 22’’ - 2 3/8’’ malibu, squash tail, thruster) for a friend that is 5’9’’ and 187.4 lb, and is learning to surf.
I was going for a double concave bottom, and i just want to check if it works on this type of board.
As for fin placement, in a thread i posted earlier i got the following reply for thrusters in general:
"For thrusters, the general rule is
fronts: 10.5 - 11.25 inches
rear: 3.25 - 3.5 inches
More forward, more loose…more back, more drive.
A good middle of the road setup would be 11 fronts and
3.4 rear.
Closer together is looser…farther apart stiffens the board."
Does this apply to boards this big? How should i place the fins? More to the front or the back? How do the measures indicated in the previous post change in relation to incresing (and decreasing) board size?
Thanks in advance for any help you guys can give me!
With the hips you’ve put in this one I think you can afford to have the rail fin and center fin boxes a little aft. I don’t think you’ll have much trouble with this board being too stiff. It may requir considerable fin drive to make it go. I think a with 8.5" common templated center fin it’ll hold in ok. The way you’ve worked the rocker into the board I don’t think it will trim very well. You may find that you have to drive it with fairly strong rail fins with a center fin around 6.0 to 7.0" Fin boxes are certain to help you tune it to the conditions you ride. Good luck Miguel.
Before I ended up with two 6" tall x 5" side fins only, I started with a 7.5, then 8.6" swept single.
But I use that board mainly for teaching, and with the smaller fins (6" instead of 8.5"), the board can be run aground with less chance of injury, and stability can be turned by adding different sized tail fins.
My twin’s trailing edges are right around 14" up from the tail…works fine up to overhead, then a trailer gets added on.
It’s not only similar to the bic’s 7’9’’ outline, it IS the bic 7’9’’ outline.
I made a template of it using Cad software, and then made some changes in it to addapt it to this board. I changed the lenght to a 7’8’’ and the tail from a square to a squash.
I used a photo of the board and then duplicated it using NURBS curves (non uniform racional B splines) in Rhino 3D and then printed a template using autocad.
Then there are some diferences in the shape of the 7’8’', mainly it’s more thick and has a diferent bottom.
I made the nose rocker more pronouced than in the bic becouse the guy will be using the board in realy hollow waves (not very good to learn, but very good to ride!) in ericeira, home of some of the best reef breaks in europe! That’s where he lives and i would love to have his luck!
Never mind the surf in Ericeira (which is pretty serious) and the board you’re building for him, I’m envious of that guy because he is able to eat at Marisqueria Ribas, which for my money is one of the greatest seafood restaurants on earth. The lobsters, carb, clams and shrimp at that place are beyond compare. All washed down with a cold Sagres dark. And the mural of “Don Lagosta” on the back wall is classic too. OK, I’m jonesing now.
…hey twa, cara, voce falou em uma thread pasada que voce solo hacia o shape…si voce da pra um pro glasser, sua prancha sempre saldra boa…de acabamento…
It´s true reverb! I always take my boards to a pro glasser, i only shape them.
I tried to glass my first board, and it was catastrophic, i spoiled a nice board with a terrible glass job.
Besides, if most of the pro shapers in portugal take their boards to the same glasser i take mine, why the hell shouldn’t i do the same! They glass boards for 26 board brands in portugal.
I pay the same for them to glass my boards, that i pay to buy the materials to glass it my self, and they do it a lot better than i do!
Why get an horribly finished board if for the same price i get a pro finished board?
I think you are right on the mark halcyon. I’ve been playing with a 7’9" bic that I use as a guest board and so far a single 8" center fin works the best.
Gonna try leed’s twin idea after I try a grennough/liddle type fin.
