carbonfiber/kevlar layup

[mrconcrete]

after about 8 months of not working on the boat..I am back at it.

It is going to be carbonfiber/kevlar layup with no core...what do you think putting down 2 layers of 5oz kevlar followed by one 5.7oz carbonfiber followed by 2mil coremat (in the areas the old core was) and then 2 layers of 5.7 carbonfiber? total cost on all that less epoxy is 550.00 I got a deal..thats less than screwing around with atc corebond and a composite core.

I know the pros and cons but I want NO wood.

I belive it will be lighter and a hell of alot stronger

a pic of where I left off at...should I use 2mil or 4mil coremat?

[kytekeith]

Is that a stream with a concave pad?

[mrconcrete]

yes, vector... concave and hooked

[kytekeith]

yes, vector... concave and hooked

What year ,and what kind of power is going on it?

[mrconcrete]

What year ,and what kind of power is going on it?

77..300+ 12" mid ,1.87 sporty

[mrconcrete]

the more I think about it I will probably put a piece of corecell in instead of the mat.

[baja200merk]

Most comp boats didnt have a core but they had 4 stringers

[Gorilla0178]

I'm not a huge fan of the coremat, it yealds no strength it just absorbs resin. By its self it breaks like a cracker. (if its the same coremat that we used to make consoles out of) I would rather see you use 1/8" k-mat or something like that. Its the same thickness, but it is actually a foam core product. Just an opinion. With all the high tech materials going into it, the coremat would be low tech in compairson.

I also agree with the stringer coment, with no core you'll need more stringers spaced closer together. The material your putting into it wont build up much bulk or thickness. I probably would go with a 1/2" scrimed and scored core. Kevlar,Kevlar,Carbon, putty,core,Carbon,Carbon,6or8oz finishing cloth. The cloth is so you can sand it smooth and not burn through the carbon. Carbon sands real real easy be careful

[mrconcrete]

I'm not a huge fan of the coremat, it yealds no strength it just absorbs resin. By its self it breaks like a cracker. (if its the same coremat that we used to make consoles out of) I would rather see you use 1/8" k-mat or something like that. Its the same thickness, but it is actually a foam core product. Just an opinion. With all the high tech materials going into it, the coremat would be low tech in compairson.

I also agree with the stringer coment, with no core you'll need more stringers spaced closer together. The material your putting into it wont build up much bulk or thickness. I probably would go with a 1/2" scrimed and scored core. Kevlar,Kevlar,Carbon, putty,core,Carbon,Carbon,6or8oz finishing cloth. The cloth is so you can sand it smooth and not burn through the carbon. Carbon sands real real easy be careful

Thanks for the help...and yes I am putting in stringers kneebraces all the BS.

[Gorilla0178]

Oh yeah corecell, the good stuff. Sounds like a plan.

[tunnels]

after about 8 months of not working on the boat..I am back at it.

It is going to be carbonfiber/kevlar layup with no core...what do you think putting down 2 layers of 5oz kevlar followed by one 5.7oz carbonfiber followed by 2mil coremat (in the areas the old core was) and then 2 layers of 5.7 carbonfiber? total cost on all that less epoxy is 550.00 I got a deal..thats less than screwing around with atc corebond and a composite core.

I know the pros and cons but I want NO wood.

I belive it will be lighter and a hell of alot stronger

a pic of where I left off at...should I use 2mil or 4mil coremat?

Time for a little thought to go into what you are going to do . Number one NEVER USE COREMATT IN THE BOTTOM OF A BOAT ! ANY BOAT !!!!!REGUARDLESS OF THE THICKNESS AND WHAT RESIN YOU ARE USING !!!!
Can use it in the topside but NEVER in the bottom !! core matt will not stand any kind of flexual movement for any great period of time . and will shear and separate . DONT DO IT !!!!!

Kevlar has a lots of streach and wont let go . Carbon has no streach and will break before it lets go .
You would have to deal with the carbon and the kevlar using epoxy resin and nothing less!!
Unidirectional fibre would be my choice just the oriantation of the strands would be the critical factor to gain the max amount of rigidity and stiffness from it !!.
If you not having a core in the bottom then a couple of stringers each side will do wonders for what are looking for as well as the carbon fibre as the final top layers and stringers over the top of that with some good double bias cloth to hold them in and down onto the carbon .

[tunnels]

I'm not a huge fan of the coremat, it yealds no strength it just absorbs resin.

Need to put the record straight here!! do you understand what corematt is used for normally ??
Anyone know !!
Im going to wait for a reply or two and see if anyone is on the right track and understands the properties of core matt and its uses !!

[mercurypro]

core mat is a stiffner .. used between 1808 etc.. make a sandwich type

[Gorilla0178]

I'm not a huge fan of the coremat, it yealds no strength it just absorbs resin.

Need to put the record straight here!! do you understand what corematt is used for normally ??
Anyone know !!
Im going to wait for a reply or two and see if anyone is on the right track and understands the properties of core matt and its uses !!

No answers yet. We just used it in cheap layup for consoles between mat and stitchcloth. I've seen material like it used as flow media for infusion but not sure if its the same. I thought it was just a bulk builder or a print blocker to block print through.
Any answers close????

[mercurypro]

( quote it is a stiffner used between layers ) this is from my rep who has sold the products for 0ver 25 years for the number 2 largest dist of resins etc.. and too the largest yacth mfg in the north..and your answer is .. and yes i use it .. but i dont like it