Thanks for the reply! Can a kit-plane like Sling 2 kit be modified and applied for Experimental Certificate? One important fact I missed in my calculation is the fuel load. The useful load of 696 lbs also includes fuel. The full-tank fuel load on a Sling 2 would be about 245 lbs and it totally messes up my calculation! I might still be able to carry four of us, but I won't be left with any allowance for the parachute.