So I built a helicopter. Everything was alright until I wanted to fly it. My helicopter turns a little bit to the right while in the air, and I don't know how to fix it. The next issue is with altitude hold: the altimeter says 30, but when I set it to 30, the helicopter descends until it crashes. However, when I set it to 120, it stays at 30/20. I've got a problem with the autopilot, but I think it is because of the self-turning helicopter. There is a link : https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3294837830