Resurrecting an old but interesting thread.


We were out measuring and studying an old Gran Segel spi today. Measuring luff curve was fun. Pretty much straight, but not at the bottom. Otherwise the spi was cut more or less like a genoa on a 35foot monohull.


Picture show spi luff folded twice (luff folded and then folded back again), so the luff curve can be compared to the relatively straight edge of the fold.
No wind today, so we spent our alotted time measuring og tinkering on the boat..

More good photos demonstrating different shapes anybody?