Steve, have a good time at the worlds! I'll be rooting for you and Macca on the Blade! Wish I had the money to go down there with the family for a break in our abysmal winter.
The Gran Segel guys in Malmø are really poor at marketing their products. As far as I know, the only good reference they have on F-18 spis is a victory in the Archipelago race with Will Sunnucks at the helm.
I'll try to measure my Gran MK-4 tonight.. It's something I should have done a long time ago. The 910cm was the current setting in 2004 amongst the pros. With this setting, you could twist the luff about 45deg with your fist before it was tight. We used 910cm, but tightened the luff line to move draft a bit forward. We could not twist the luff much at all, and that was fast downwind if you could 'wild thing'.
Take a look at these pics, from Mike Dobbs (username Tornado here) photoarchive. These are from the Miami OCR and T NA's, and demonstrate quite clearly how thight the luff is set on the Tornado these days.
http://i5.pbase.com/o6/30/7530/1/73986543.uVpshoTo.IMG_3883.jpghttp://i5.pbase.com/o6/30/7530/1/73986546.GbLur4SS.IMG_3887.jpg
