So just to clarify.foam-n-fibre wrote:Just saw this thread, and thought I might add something about comparing different weaves. I made up some test strips using 1/8" corecell, about 2cm by 20cm, with three different types of cloth I had around. I was mostly interested in stiffness. They were glassed on both sides with 1 layer.
I was comparing 12oz bi-axial E-glass, 8.9ox fine weave S-glass (style 6781), and a 7.3 oz mostly unidirectional E-glass with about 90% of the fibers aligned with the axial direction (style 7715). Stiffness was simply judged by flexing the strips by hand. The 7.3oz unidirectional E beat out the 8.9 oz S, and the 12 oz bi-ax came in last. I expected that in this direction the 7715 would beat the slightly heavier S, but was not as sure what to expect from the bi-axial heavier stuff.
Of course this does not measure impact resistance, I expect the resuls would be opposite.
As for torsion, the 7715 still feels stiffer than the S, but I think the bi-ax might take that, but hard to tell. I think torsion is huge for snowboard building, but with tapered tips on a typical twin tip, I don't expect torsional stiffness is nearly as noticable.
For what we are building where much more strength is needed in the long axis, it's worth exploring the different weaves like tri-ax and unidirectional, and not just different cloths like E, S and carbon. You might find good strength vs weight vs cost without having to go to carbon.
Excellent Find on the video there, Mr foam n.. !!foam-n-fibre wrote: ...
I wonder what speed of rebound is best for pop in a board???? Maybe we should be all making thin carbon boards like the Brokite guys(?) If anyone has not seen what I'm talking about check out their construction videos.
http://www.brokite.com/joomla/index.php ... &Itemid=63
& each of those sides turn into sheer-web, the flex of the board can still be adjustedplummet wrote: ...
you end up with a completly carbon board that is light and in theory very resilient. theres no foam to delam and the bridging should keep the board strong as.
Will it work? i dont know. but the idea intrigues me.
that defiets the purpose of making it all out of carbon. which is to have the same modulus through out the board. the same shear strength. the same flex characteristics.BWD wrote:Or you could just use a sheet of something already corrugated for a mold
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