Say the first F16's flexed 64 mm when layed up on their sterns with one hull lifted (note that the standard Hobie Tiger and Nacra F18 flexed in this test by 92 mm !). In fact, my homebuild Taipan F16 (small beams) flexes by about that amount. The first Blade (small 80x2 beams) flexed 40 mm and the newer Blades flexed by about 30 mm. The Falcon with newly designed custom beams is stiffer still and the Stealth always flexed in the order of 20-25 mm (was a very stiff boat from the beginning). Lets say the Viper flexes by about half that amount say 10 mm (on a par with the very best all-carbon A-cats and way better then the modern F18's).
I didn't realize that other F16 flexed that much. Where did you get those numbers from? I'm going to measure the flex on my Stealth next Saturday as I'm curious now. I have an original Stealth: narrower than the F16 box rule and designed with a custom front beam with no dolphin striker, I wonder how much difference this makes.
