I make all my own, but I lay them up myself.
Doubt that any body would have already layed up offcuts suitable for fins.
You may be able to buy a sheet of epoxy/fiberglass that a lot of professional fins are made from, I think it's called s10. It's made under high pressure, giving excelent fibre to resin content. Not sure about suppliers, fiberglass & resin sales may be able to help, or you could try a google search.
Cheapest way is to lay up your own, you can pre cut the cloth so you don't have to so much sanding.

decrepit

There was a mob in jandakot which sold fibreglass laminated sheet of various thickness's and grades for industrial and boating use.

Sorry can't remember the name of them but if you headed west of the freeway at armadale rd turned right at the lights at shopsjust past overpass. it was in the front row of factories in a light industrial area on your left.

Alby


Plan for tomorrow.
Live for today

You can get G10 which I think is used for circuit boards.Once you have made a fin and find out it's a complete prick of a job, you probably wont mind paying a few bucks for a decent fin .

jim

G10 is likely available from electrical supply houses, we bought a panel about 10yrs ago and then had to glue it together cause it was too thin. The really great thing about g10 is the plies are so regularly spaced that you can use each ply as an indication of thickness for foiling. Just imagine that as you sand through each ply it looks like the ring of a tree. This means that it forms an appearance like contour lines on a map. Without this it can be a real bitch to get a good foil. Oh and don't forget that after managing to get a good foil you have to have a decent profile, good lateral twist and then good torsional twist too and then box em right so they don't stick out, don't fall into the box and don't allow water through. All in all I prefer to buy em but if you reckon its gonna be fun then youre a different man to me. 8" Disc sanders are likely the best tool and I recommedn buying some cheap ****ty fins second hand and refoiling them first to get your eye in. The layup if you wanna do that yourself is around 50-60 plies of 200gsm plain to get sufficient thickness, if you use polyester be wary of exotherming resin due to ply thickness.

Enjoy

having second thoughts yet markh

GONE WITH THE WIND

it would be easier to get hold of a good quality fin and make a mold of it,then it's just a matter of laying up the cloth in the two halves and clamping together,this way you will know that your going to get a perfect foil and it allows you to play around with the fibres to get differences in twist etc.

I used to make fins for Multifin about 100 years ago. The moulded ones were done with unidirectional glass.This stuff was pretty heavy duty gear so you dont need to spend ages putting down heaps of layers. You can lay the fibres to what you think is going to work best for twist or stiffness(Whataever you want the fin to do)This might take a few goes to get it right.You can still put a few layers of light woven cloth in the mould to finish it off nicely.If you put extra layers on once the fin is out of the mould it will change the chord of the fin a fair bit.I still think making fins is a complete prick of a job,Moulded or handshaped.But good luck trying.Let us know how you go.

jim