Thats a great little plane and if you will notice the servo tray can be moved to balance the plane out before its glued solid .A 61 FX did the trick on mine .One word of caution look at your wing spars if there Balsa I would trade them out for either Bass wood or spruce .The earlier kits has the balsa spars and the wings failed .I'm just finishing up a 60 sized at the moment .It won't be the hot rod my 40 was ,but still should be ok with a 91 Saito for power .