Well,.... Today I finally got a chance to fly my Hog-Bipe with my new engine combo, "Thunder Tiger .61pro with a pitts muffler". It flew great with a 12x8 prop. I fixing to try a 3 blade 12x6. I love the looks of the three blade props. This is definately the best engine that I have found for my Hog. I bet the Saito FA-100 would be a great powerplant for your hog. Also just make sure all of your control surfaces are slop free and definately use the twin aileron servo setup. I saw one members Hog that just had one servo for all four ailerons and it had a bad flutter problem. I would also suggest replacing the tail wheel. I used a .60 size Klett tailwheel assembly. Also when finished post a pic of your Hog, I always love seeing how others modify their hog. It has to be one of the best kits for "bashing".