I increased the rudder by 1 1/2" and sustituted a Sullivan tailwheel. I also made a FG cowl and removable fuel tank cover. I had a ST .45 in mine and it was pretty fast compared to other SSEs. I think the cowl had a bit to do with increased speed. A really fun plane to fly. I'll build another one when I finish with the 2 Waco UPF-7s I'm on now. Good luck-Brother