I have a Foxtech Nimbus VTOL. When in Qloiter mode, as I advance the throttle, only two out of three motors start to spin. The third motor start spinning after more than half throttle. Then as I advance more throttle, the two motor pick up speed and lift the plane to one side then all the sudden the third motor start spinning and the plane lift off. Although it do lift off and hover fine, but the take off looks very erratic and dangerous. But in Auto mode with the first waypoint as VTOL take off, the plane lift off beautifully.
I would like to know if this is normal or I need to adjust some parameter. I have calibrated the ESC.
Thanks