The prototype laminate schedule was two layers of 6oz fiberglass. I did this because a couple of test halves I laid up with two layers of 3oz just didn't seem rigid enough. As it turned out, once the whole thing was joined and the primary bulkhead was installed, the thing is solid as a rock - and now a little on the heavy side (the two 3oz layers would probably have been enough with a little help. There is no core as it would really just add weight and complexity unless I glassed the core with something like 1oz glass...the scale just gets too small at that point. The two hull halves weighed in at a little over 1 lb and I think I can safely get them to .75 or even .65lbs.

The next ones is going to be one layer of 5.7oz kevlar/carbon with an inside layer of 3oz s-glass. If that's not enough, I'll go to two layers of 5.7oz carbon - but that should be plenty. My only concern with the super-light schedule is oil-canning on the flat sections near the bow - I may vacuum and glass in some triangle-stock balsa stringers in that area to give it a little more rigidity.