Mine has a Magnum 91FS with an APC 14x4W, it flies great!, but I had to change the ball links in the stab for the adjustable ones from DuBro to get rid of some flutter above 1/4 gas,after the change every thing was perfect, make sure not to get play in the stab system and use a good servo. The Kulbuto, waterfalls and hover are excellent!!.