I have refitted my old SplashDrone (amphibic quadrocopter) with a HolyBro Pixhawk 4 Mini and did my first test flights today.
When in Stabilized mode all was ok.
When taking off in Altitude mode it was very difficult to control altitude. The copter bounced several times back to ground and was not able to keep a stable altitude. Even when trying to land the copter touched ground and took off again. I had to immediately disarm on ground or go back to Stabilized mode.
When in Position mode position accuracy was ok, but altitude accuracy was same as bad as in Altitude mode before.
If the barometer not working correctly or why don’t I see the oscillation there but on accelerometer of Z axis?
For the first log the copter was not sealed, so air pressure has reached the Pixhawk without dampening
For the second log I have sealed the copter. Air pressure reaches the Pixhawk through a special seal which is permeable for air.
What should I do to fix this?