The Ulti was my first flat foamy; Horizon recommended the 3600kv inrunner Park370, 20A Eflite ESC, and Eflite 1200 3S1P lipo. Everything worked fine, but I wish I had the 4100kv motor-the 3600 is a little low on power for the 13.4oz plane with either a 11x4.7 or a 12x6. The plane itself is ok, but for being designed by an aeronautical engineer there are a couple of glaring faux pas: one aileron servo is enough if you put it inverted in the front of the top wing, and the horns linking the upper and lower ailerons create a terrible geometry problem among the four ailerons, making them travel different amounts up/down and upper/lower. The durability of the foam material is disappointing; since the Ulti I have built other foamies that are much better designed with better materials....Jim