Your local North loft should have the designs on file? North did lots of design work over a few years on J97s in the UK. Your C0/J0 sounds like a fantastic sail for the boatThanks for the advice (last Summer).
Anyone with picks from the foot upwards of J/97 jibs? Would be interesting to see the shape especially of a North J1.
Ordered a C0/J0 crossover(47m2 mid girth ~63%) for light wind beating and reaching in all other conditions. Will fly it off the end of the sprit and furl on a Facnor FX.