Align TREX 150X running on a Align 2s 300mah Lipo headspees flat curve of 70% got home and kid was still napping. Was a bit windy but why not right? Most of the time I was fighting the wind after the 1 good circuit. I don't recommend this as an entry level heli. That would be the 470L same price, same parts price, but a whole bunch of more heli for your buck. Dont get me wrong, this thing has its niche!! Tight spots, indoors, and perfect for travel!