Hey guys, i'm looking at building a small directional which will have a strapped option. Maybe 5'8" or so by 18.5" I built an EPS epoxy and bamboo veneer board last year for riding strapless, but want something smaller and with a strapped option for higher wind and more bumpy days. It'll only ever get used in onshore great lakes conditions and maybe Hatteras oceanside, so not peeling perfect waves like we see in some places, but it's not for mowing the lawn at home in the flats either. Mostly onshore type beach breaks.
The ESP I have is about 1.7 lb/ft, and the blank will have no stringer, or at least that is the current plan. I have built full sandwich windsurfers before with corecell top and bottom, but don't plan to go that far. I'll have corecell in the heaviest loaded parts of the deck for sure, but am not sure if I should have it cover almost the whole deck. Also on the bottom, I'm wondering if I should add some HD foam. I'm considering a strip of HD foam laid into the bottom, maybe a few inches wide, to help with buckling stiffness rather than the whole bottom, and then doing the thin bamboo veneer over the whole bottom for extra strength and bling. I would probably do at minimum a similar strip on the top under the top bamboo.
Has anyone done a board like I'm describing? Any suggestions on the layup? It'll be probably 2 inches thick at max. I might do carbon rails since I have some carbon, but won't do a full layer, and don't expect doing just the rails adds a whole lot of extra strength or stiffness. I'd probably have 2 layers of 6 oz with all the other stuff I'm describing, but do have 4oz kicking around also which could be added or swapped in. There would be a bit more around the straps I expect.
Ideas?? What is the usual failure more on a board like this? Originating from a heel dent? Tension or compression on top or bottom?
edit: I'm about 160 lbs, FWIW
Thx,
Peter