Hi, Just thought I'd share something that happened to me. I do preflight power checks and was basically pushing the elevator / aileron stick to all four corners, several times quickly, while on about 50% power and one of the blades came undone. I guess the motor much have slowed quicker than the blade. I follow the instructions in the un-boxing video, which just seemed to spin the props down onto the motors, but this doesn't really look like its adequate all the time. I've recently had the props off to do the firmware update and have been doing a few other things, but as far as I was aware the props were on "finger tight" But I guess in future I better make sure they are really secure.???