This afternoon, my three week old FC-40 took off and was last seen headed east as fast as it could fly. I am not really new to this...I've been flying a V 1.1.1 since December and between the two of them I have at least two hundred flights. I followed my protocol...waited for six greens, take off and hover while I yaw the aircraft in both directions and when everything looks good to go I begin my flight. This time, the instant I gave it forward and up commands, it took off up and away as fast as it would go and refused to obey any inputs. When it was a couple of hundred yards away and a few hundred high, I seemed to get back control as I got it to turn back toward me ( I have double headlights on the front to aid in orientation) but it was still gaining altitude. As it flew back past me, once again not obeying inputs, I turned off the transmitter hoping to trigger RTH but it didn't work. The last I saw it, it was heading away from me a high speed and it looked like it was still gaining altitude. I have my name, address and phone number on it but I'm not hopeful...I think that if it had been found I would have heard since it's been seven hours. I sent a lengthy email to DJI and I plan on calling them also, but I'm not hopeful on that front either; I have enough experience to know that it was a true flyaway but I guess everyone says the same thing so how do they decide? If anyone has any insight on how to get them to replace it, please let me know....i can't afford to replace it out of pocket !