For both examples I have suggested both a classic "woven polyester" (Dacron) and Fusion MC composite membrane option. Based on the size, hence, the loading differential, the fiber type would change. For the Valiant 40 the Fusion MC 4000 composite would utilize a polyester fiber network. For the Passport 545, The Fusion MC 6500 would use a carbon/technora fiber map. Both woven and composite versions are equally rugged. The Fusion MC composite would offer better initial shape holding and significantly longer shape life. (For a distinction between sail life as a triangle and life as an airfoil, please see attachment "How Long Does a Sail Last") There are various pre-made materials available to use in "paneled" tri-radial constructions, including Hydranet, Fibercon, Radial Dacron etc. which are not composites that could also be considered. Hydranet, a spectra-reinforced woven material, has been used in this application with success. It makes a durable sail with slightly better performance that has no mildew issues, though typically round the world sailors don't have mildew issues because the sails are in constant use.