ORIGINAL: mmiller1
I just built a Bruce Tharpe Flying King (the smaller one). I have powered it with a TT 91 4S. Battery is about center as are the servos. According to the plans the CG is to be located anywhere from 4" to 5" behind the LE of the wing. I set it up as indicated. The plane took off just fine, but at full up elevator there was no way it would loop. I know other members in our club who have this a/c and they claim it will loop at 1/2 throttle. I can only conclude the CG on my craft must be wrong. Any ideas??
Tim in Tacom
Keep in mind that the manufacturer recommended CG is just that (recommended). If the airplane is nose heavy than slowly move equipment aft until the airplane flies and feels better. Also the recommended elevator throw of 1/2 inch is going to make your pitch axis very limited. You can increase this throw to give you more pitch axis. So my recommendation is move CG aft and increase elevator throw.