hi,
I´m building foilboards/wingfoil. I have uses 160-200g/m2(5.8-7oz) used one layer or two on deck and rails. and ofcourse a few layers over the foilbox.
what I see peopple do now is doing like 4-5 layers lighter fiberglass and IM getting confused. to me it seems harder ro laminate in that way and might become heavier board?
usually also mix carbon fiber with glass witch is against all rules.
tell me what am I missing? shouldi continue with my old method?
cheers
Sways member Lemat is the person who can give solid advice about this.
Waving fiber: one heavier layer have of course better interlaminate strengh but way more crimp that reduce fatigue resistance and overall stiffness.
Stitch fiber : no crimp, one heavier is better than multiple layers.
The key is fiber direction/stress.
You can and most of time must use fiberglass with carbon. Just need to know that when glass and carbon fiber are stretch in same direction, carbon take more load.
This is my 150l freeride windsurf board all make with carbon, glass and a bit of cork over eps, strong and light
feels like the more I read and hear about it the more confused I get;) I will not use carbon anyway it is too expensive. i use to go with plain fiberglass. this time I think I go with twill when it is said to me easier to form around more complex structures. then I read that satin is even more shapable, but maybe not as good strength than twill.
Lemat,
Not clear to me what your answer is for this question.
Would 3 layers of 4-oz cloth be better/stronger than one layer of 12- oz cloth?
Yes and no, that’s why it’s not clear LOL.
12oz UD no crimp fiber will be far stronger than 3×4oz 50/50 plain waves under tensil forces in direction of UD fibers. Also for compression in fibers direction and bending around lenght and shear perpendicular to fibers. But because forces are not always in one direction…
I bet that 2x3 oz well laminate plain waves will be at the end more or less same as 1x6oz same fiber plain wave well laminate…
Glass is an happy medium performance fiber and a price winner. Except ultimate low weight you can do everything with it.
Stiffness, strengh fatigue strengh reduce with crimp. Crimp come from wave of crossing fiber. Flat fiber = no crimp. From lower to higher crimp : satin, twill, plain. Fiber distribution and shape (flat or twist) play also.
Thanks lemat for this info. In my mind it was the other way around. Thought more crossings over and under would give more strength. then the satin has the highest strengt of the three types sating,twill, plain. Crimp was also a totally new word! great stuff… feeling less confused;)
Here is a neat little handbook from JPS Composites, explains basic properties, weaves, finishes, etc.
If one messes around with the data in the handbook, one might conclude that 2 x 6oz is slightly mo’ bettah that 3 x 4oz and 1 x 12 oz in terms of dry fiber strength. I would imagine a laminate to perform better than its raw glass material but I don’t know how to do the math for that…
