4mm Drop Through Possible.....? W/ Triax Fiberglass

[7RISTAN]

So I Wanna Make A 4mm Board Drop Through, How Many Layers Of Triax Would I Need?

[SteveC]

So 4mm of wood? + glass.
If so, yes It's possible.

Though I'll leave the particulars up to someone with more experience.

[lettucefresh]

you gotta decide on your wheelbase, construction method and material, concave, etc before this is even relevant.

[7RISTAN]

btw.... i'm working with bamboo and plan to heat cure the epoxy for added strength.

[7RISTAN]

you gotta decide on your wheelbase, construction method and material, concave, etc before this is even relevant.

oh man, i'm a hypocrit... i always get mad when ppl just expect answers without specs, but i managed to forget to mention them this time....

i plan to make the board

40" long
9 to 9.5" wide
and 31" WB
bamboo

basically a dervish with two inches shaved off i gues

[lettucefresh]

is this a speedboard or a flexy carver like the dervish?

[7RISTAN]

flexy carver!!!

i wanna make two with different flexes,

like one for riders 180 and up for my friend

and one for me.... 130 lbs

[lettucefresh]

are you planning on putting concave or camber in it? if so, it might be a better idea, and easier to do 4mm of bamboo+ 2 (1/16") plies of maple or 4mm babmboo+ 3mil baltic birch, or 3mm bamboo+ 3mm bamboo, that way you can laminate it to get a good snappy camber and concave.

otherwise...
what weight is your glass? for 6-8 oz. glass i would say you're going to need 3 layers at least to get the flex and return you want.

[7RISTAN]

NO CONCAVE.
camber.... i will press the board with the glass on it and heat cure the epoxy by pressing it in a board kiln, this will allow the glass to hold the camber.

i will be using 19oz triax.

so i was thinking two layers of that and one layer of 3.7 oz s-glass

you think that would be sufficient.

[lettucefresh]

well as long as the tri-ax is s-glass also. otherwise it won't do a whole hell of a lot other than insulate your board from electric shock.

[7RISTAN]

well as long as the tri-ax is s-glass also. otherwise it won't do a whole hell of a lot other than insulate your board from electric shock.

oh crap ya... the stuff on fiberglasssupply.com where i was going to get it doesn't appear to be s-glass. good save. thanks.

know where i can get some triax s-glass

if not i'll have to stick with the three layers of uni you mentioned

[Cranks]

why are you stuck on triax or uni? regular 90* weave is just fine, throw in a couple layers at 45* for torsional stiffness.

The concave and where it is and isn't will have the biggest effect on the flex. Make it even and don't have any narrow spots with no concave unless you want it to flex and be weak all at one spot.

My advice would be to lay up the wood with 3 layers of glass on each side, and then see how flexy it is, adding more layers until you get the desired flex. Keep in mind it will "break in"and get a bit more flexy than how it is right out of the press.