G'day Scarecrow they were just off shore puffs officially measured on land at 56km/hr throwing us around, if you watch Fergs on the tiller he's pretty steady. Now I know you guys are there and you guys have heaps more knowlege of boat design, sails and masts. I would say that if Devon's mast has about 50-60mm pre bend he could carry a bigger head main and lessen his prebend to 20-30mm or less. How do you work out how big the head can go, how much prebend? You need the camera on the spin pole to share the pain Chocko