Hey Everyone, I hope someone can shed some light on what may have been the problem. I changed out my stock props with the 9450's. I went outside my house to test the quad. I did not calibrate the quad because I have flown in my yard dozens of times and felt it would be a non issue. I waited until I received GPS signals and the light was blinking green. I engaged the motors and took it up maybe 20' to hover. All seemed fine at this point. I added a little bit of throttle and it just took off. Shot up to about 80' and started flying away. I had no control over the quad so shut off transmitter hoping it would return. As soon as I powered off the transmitter the quad fell from the sky to the ground about 200 yards away in a neighbors driveway. 3 of the 4 props broke, gimbal broke, landing gear broke. So my question, should I have done the "calibration dance"? Is there a setting in the NAZA software I needed to adjust for the new propellers?