Quadcopter front is lifting much more than the back during takeoff

ArduCopter Copter 4.0
1

I have just build a quadcopter with an F450 frame, a Pixhawk 2.4.8 and MP (Arducopter 4.0.7). When trying to take off, the quadcopter tilts - the front is lifting much more than the back (and I have not gone any further…). I think I have done all the MP setup steps and calibrations (Accel, compass, radio, ESC). There are no errors in MP. Any suggestions, please?

Thanks,
Oliver

2

Adjust your center of gravity (COG).

Lift the quad by the top of the motors diagonally. If your quad drops down on one side, shift something weight-wise to balance it out. Repeat for the other 2 motors, diagonally.

3

Post a link to the .bin flight log.

If the accelerometer calibration is done properly and your craft has sufficient thrust for stable flight it can handle quite a bit of off-center load. However, if the commanded motor outputs are maxing out it cannot stabilize properly.

4

Thanks, llamatrails. I think the unbalanced battery was the issue. I have just changed COG and tried to apply some thrust in my kitchen and it seems to lift stable… sigh… in hindsight, this is obvious now :wink:

Thanks, both for your comments.