more like 8-9 degrees on this one. I had to increase the angle somewhat because of the low profile of the sponsons (25mm), otherwise the only way i could get it on a plane would be to hand launch....which is possible, but i would hate getting stuck in the middle of the lake with this tiny thing. Still haven't found time to try it out. It's a trial and error thing that's true - but next time round I'm gonna try an adjustable sponson rig. Basically the carbon rods would be fixed to two aluminum triangle, and the top corner of each triangle is bolted on to the main tub with fly-nuts. That way you could adjust angles and distances when weight distribution possibilities are limited....

I couldn't do this with this rigger because of the curve in the side-walls of the tub....