I am experiencing strange problems. When testing stabilize on grund it works as expected. In air, APM will send the aircraft into an inverted spin within 1-4 seconds ins stabilize mode. This is with APM 1 and 2.5 (different recent firmware versons). The APM 1 has been in a Raptor (2m) flying many successful missions.The new airframe is a maja from bormatec.
We have tried the Maja param file from the APM wiki, we have also tried stock settings with the same results. At the moment, I don't have an Idea where to search for the problem. Any thoughts?