I had these measurements from when I had a C29 - can't say for sure if they're accurate: I = 10000 J = 3500 P = 9000 E = 2800 Mast = 10000 C28 = (9.87m) Boom = 3000 Forestay = 10800
What is P and what is E? I I found them on Google Mine is the predecessor the Northerner28. My mast is 10.13m long and the boom is about 3.3m You could join the Compass yacht group site and ask there also. If you are buying a new mainsail, then measuring your own boat would be best, because sometimes changes and repairs are made to masts. However my data copied from the CYG site is the main sail is luff/leach/foot is 8.76/9.3/3.58 = 16.72 sq metres or in imperial: 28.75/30.50/11.75 = 180 sq feet.
FabulousPhill said.. If you are buying a new mainsail, then measuring your own boat would be best, because sometimes changes and repairs are made to masts.
