Gentlemen: I have read with some interest the discussions of strength and stiffness. There are several points which should be noted. Strip built and plywood hulls are quite dissimilar in construction and the way hull forces are distributed will be different. Strip built hulls are very curved and hull forces (those that act as point loads) are distributed to the rest of the structure as compression loads only, these do not behave as flat panels as most tests appear to be done on but rather like stone arches which have resisted compression loads for centuries. Compression loads just need sufficient cross-sectional area to resist them. Distance between inner and outer layers has very little bearing on this type of stiffness unless the hull is so thin that it fails in local buckling. The amount of stress imparted to the wood or glass is proportional to their relative moduli of elasticity thus the glass will take on 56% of the load and the wood takes 44% of the load. Thus there is a slight benefit in increasing glass thickness over wood thickness, unless one considers weight to be of prime importance then wood (red cedar strips) which weighs 1/3 that of a glass and resin mix would be the preferred item to be thickened. All other discussions considered it would still seem that the best proportions have been arrived at through many years of trial and error. It would then appear that if one wanted a hull with slightly different properties then both wood and glass thicknesses should be adjusted in tandem. Bram