Thanks Gareth, I`ll try that route. I guess my question could be re-phrased a bit :
If I want to go "high-aspect" on my daggerboards while remaining within class rules, I`d have to lose approx. 30% surface area as opposed to max. class specs, which gives a "square" board underwater. If I move the max. thickness back & have a slightly concave rear section toward the trailing edge as per the skiff type foil (NLF section), theoretically I should be able to point higher and also have a more efficient foil (elliptical tip). At what point would the increase in efficiency be nullified by the loss in lift-producing surface area ? Would it be less than 30%, in which case I`m better off with standard foils, or would the increased efficiency overcome the loss of area ? I guess I`d need to do a whole lot of mathematical calculations to figure it all out, only to find that in the real world it all works differently. And in order to do the calculations, I`d have to first become a Bill Roberts / Wouter / Matt Bounds type character (ie someone who knows these things through years of study or esperience )

Cheers
Steve