I just finish working on my T-rex V2. Everything seems to be set up properly. The heli hovers pretty good for a few seconds and then suddenly the mptor starts to bog down. I am using the stock motor (with 12T pinion) and ESC that came with the heli. I power it up with a 22C pack lipo. I even tried it on different lipo with same results. I also tried to put the same Align ESC (as the stock) also the same results. I couldn't find the problem. It seems I am out of options. Needing some help to figure it out.