Hey All
I too built the PT-40 kit, in hindsight, I would have removed half of the dihedral. The airplane is very forgiving and stable for the novice the way it is designed. I will convert mine this fall to less dihedral and to a conventional gear set-up. The engines that have been installed on mine are a K&B 40, OS LA 40, and currently a pre China tower 40. Plenty of power for this airplane, however, I just got a K&B screamin' 48 that is going in it next. As I see it the airplane is built strong enough to hang a 60 sized engine on it.
-Tom