The most common bi-weave used in Canoes and Kayaks is a 50/50 blend, with arimid running longitudinally and carbon fill inserted at 90 degrees. As per Sweet Composites, it is ~8 mills thick and weighs 5.6 oz per square yard and costs $29/yd in 50" fabric by the roll. Carbon is 58% of it's weight. By comparison, the standard arimid fabric used in paddlecraft is 5 oz sq yd and 10 mills thick, costing $16/yd in 50"goods by roll. The usual carbon is 5.7 oz sq yd and 9 mills thick, costing $28/yd in 50" goods by roll lots. Both are 0/90 degree taffeta weaves, but I've always preferred the four harness crowsfoot weave because it lays in better and has a slightly lower "kink", which improves strength a little.
So if I'm reading this correctly, a square yard of aramid (Kevlar) would be lighter than a square yard of carbon at the same thickness. Is that right? For some reason I thought carbon was lighter. Maybe because every lightweight thing from bikes to car parts seem to be made of carbon.
Gavia, congrats on your purchase.