RE: Phoenix Models Fun Star 40-3D
I think either of the engines you listed, 40 XL or 46 pro, will work fine on the Funstar. Although I'm not real familiar with the magnum, but any 40/46 engine should fly this plane well. The funstar is light and has plenty of wing. It just depends on your flying style. I flew mine with an OS 46Fx and it had plenty of power. I tend to lean towards, the more power the better, and with the OS, I never felt it was lacking. The Funstar is not meant to go fast. Also the prop noted in the quote from exciter900rr (12 1/4 x 3 3/4) is the prop to use. If you have other plans for your TT 46 pro, then mount the magnum on the Funstar, I think you'll still have fun with it. Hope this helps