I like four strokes. If possible I will use the Saito 72. It's light and powerful. From the plans it looks like I'm going to have to either move the firewall back or make some room at the front. I will be starting the Primus about June 27th or so when I get back from vacation. Any comments or sugestions about the kit would be appreciated. By the way, I will modify the verical stabilizer and use 1" of dihedral under wach wing tip. This will improve the looks and make it roll better.