we recently started experimenting with the different flight modes on the APM 2.0 and Mission Planner GCS and we are running into a problem. When we put the plane into Loiter, RTL, and Auto modes, we find that the plane (HobbyKing Bixler) keeps losing altitude on its own. Shouldn't the plane hold the current altitude while in these modes? We have the Bixler parameters loaded onto the APM 2.0 and our plane has FPV gear on it as well.
Thanks for the help!