Hi all, I am a new member to this forum and this is my first post. I am building a F450 quadcopter. Using an apm 2.6 FC . I set it up as per painless360 YouTube videos . Using mission planner. I did have it setup correct at one stage, where I was able to arm the board and throttle the motors from zero up to max speed. The next time I did it I must have done something wrong because when I armed the board the motors started running right away, and when I increased the throttle to max the motor speed only increased a small amount, no were near max speed. I have gone through the whole process again, and I still have this problem. Can anyone suggest a remedy?