Re: Replacement Sail Dimensions
Actually the foot of the Chance main is shorter.. 10.25 vs 11.00 so will fit OK but be slightly short on the boom. The hoists are shorter on the Chance sails so they'll fit but you'll lose a bit of sail area - probably not enough to notice unless you're racing. The difference in the J measurements for the genny are probably negligible.
Used 'make do' sails will get you going but ultimately are not ideal and you'll probably end up at some point getting something that's a better fit.
For the Genny the LP measurement and clew height are other important considerations to ensure that the existing tracks will provide a good sheeting angle.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)