Please Dan and Tornado Alive do the same (i.e. take the measurements) on yr F18s.
Sorry mate, boat is de-rigged and de-beamed ready for the trip up to the Worlds. As of this weekend, you wont here from me for the rest of the month. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
P.S.
Incidentally are you aware of Gransegel spis on the boats of WORLD CLASS F18 crews?
Whilst there are none better as far as Tornado kites, from what I have heard, they have not got the shape right for the F18s as yet. Anyone out there running Gran Segel F18 Kites ?????
As for luff tension, like I said I run mine tight. Minimal twist if you grab the full with your hand..... Under load though it will not look quiet so tight as you have a bit of flex from the pole, stretch from the sail cloth and halyards.