Big Board Build

Gestalt, of your 2/designs if push came to shove, the first, but only a narrow margin.

JH..... the OES is outta this world, tail shape is righteous, nose what's the point of it being cut off?
should I bugger mind up in construction, good to know

My 2cents Gestalt the rails look quite thick, I understand thinning them would decrease the board volume, or compensating and retaining the volume would mean an even wider board with thinner rails.
I think more bottom tuck might help thin the rails a tad.
Have you thought of moving the mast base and all straps maybe 60mm to one side the bottom turn side, yes it would be assymetrical.
I've used that program and hats of to the people who can gauge the rocker line and relevant entry points from a diagram especially in relation to the mast base and footstraps. I can't.

I think it is hoop,
xps is the extruded stuff. xps-nd is 32kg/m3.
next step down is the eps-vh @ 28kg/m3.

Hey Gestalt I just kicked my shape 3d in the guts after not using it for a couple of years it still works I'm a bit rusty with it, can you email me your files so I can have a play with them and send them back to you with a few changes. I won't rip off your design I've got no use for a board that big. I'll also send you one of my big designs 113L 2250 x 66 from a few years ago that I never bothered with. pm me for me email if you want.

hi Rider,
board looks great. is that your rocker line too? how do you find it. been thinking of flattening mine further. half way between your board above and my current version.

i'd like to get thinner rails but just don't want to give up on the width and the length. however, I took your advice and tweaked things further and did improve the rails slightly. then compared it back against some fanatic and simmer boards. the volume of the rails on the current version are inline with the simmer I have which has pretty boxy rails.

I am keen to keep the rails hard because i'm looking for as much speed through turns and on the face as possible. also, from what I understand, with a board with a really wide tail if the forward rails are too soft the tail can push the nose down.

last night I changed the rail edge of the middle of the board in the shape 3d so the rail has a tuck rather than a curve. then moved the apex of the concave toward the rail. that increased the bite of the rail. actually looks a little like your now but thicker.

couple of other things. shape3d allows me to copy slices. I copied the mid board slice and pasted it one slice back. then adjusted to smooth out the transition from mid to tail. that introduced a fraction more volume in front of the straps. benefit was to enable me to remove some thickness from the nose which reduced the forward volume and balanced the distribution more.. in short less weight up front.

guess I'm at the point of adjusting by millimeters.

I genuinely appreciate your offer to tweak the board for me. thing is the original file came form a long time friend. whilst I have literally changed every single parameter of that original board and the current shape bares no resemblance he has had some of his surfboards copied and sold under different names in the past so I just don't want to test the friendship. plus he's going to help me with board construction because we've done a few things like this before.

that said. really appreciate the input. this project is a bit of fun, trying to explore the possibilities and see if the idea has any merit.

I would do the EPS - good choice

The XPS is annoying to shape, and it does outgas and delam when it dings

I use that 28kg for kiteboards and with carbon/wood its solid, no heel dents. So will be fine for a non-sandwich windsurf board proto
I reckon you're onto it

thx Rider / Mark.

I spent the last few days exploring the rails further.
been looking at and measuring all of the boards in the garage to see how they were handled. the rails on the fanatics i have are really interesting. they are quite square and very similar to hard rails on high performance surfboards. I notice goya and quatro rails (looking online) are also squarish. those boards have a flattish curve at the apex of the rail, fanatic especially.

the rest of my boards are more traditional with a definite apex and tuck with the simmer being especially thick through the mid section.

great thing about designing boards in software is the ability to see how the volume distribution changes every time you move a point a few millimeters. down side is you start agonising about things that don't make a big difference.

it's super handy to be able to ghost the original board and see how the tweaks have effected the volume distribution, rail curve etc so I can see if changes so far have made functional steps forward.

the conversation has definitely pushed me to improve things. current iteration just needs to be built and surfed.

yeah no worries.

pm me the details. i'll flick it back then new can get another thread going. it's the duldrums here. no wind for weeks.

something I was hoping to do with the board is to use a rear strap that can be flattened when stood on. so I can surf the board without using the rear strap or use it if needed.

has anyone tried this before? kite hook straps don't seem to appeal.

Maybe an extra wide raceboard beating strap?

Maybe wide seatbelt over EVA?