Pitch problem in auto mode

Hello.

I am trying to set up my helicopter with ArduPilot Mega 2.5 but I have problem with pitch in auto mode.
In Acro and stability mode the pitch is working as it should but when I switch to Auto it apply full negative pitch.
I can not find the problem, can anyone help me?

/Stefan

Hi Stefan,
Is this happening on the bench, or in flight?

Right now it happen on the bench, but a few years ago I also tried this and then I tried it in the air and almost crashed the helicopter when it pushed itself with full negative pitch towards the ground.

/Stefan

OK, that is normal on the bench and it should not respond to the sticks in Loiter on the bench either. In flight you must make adjustments to the collective settings to get it to hover at mid-stick in stabilize. Otherwise when you switch to the altitude controlled flight modes you are in for a surprise. With the APM in 3.2.1 this was done by adjusting the H_COL_MID param to be about 5.5 degrees of collective pitch. In 3.3 and later there is settings for a Stabilize collective pitch curve.