Manned size configuration

Hi, I am cooperating in developing manned drones in South Korea.

During the flight test of the prototype we made, the same phenomenon as the attached video continues to occur(at 0:10~).

There is no problem with hovering in non-GPS mode, but in hovering (Loiter) mode where GPS is involved, sudden jittering is performed at the time of transition.

Any idea about this? Is it a problem unique to the large aircraft?

The Ardupilot developers strongly discourage the use of this software for manned applications. Please use certified software and hardware for such applications!

Then let me ask you a different question.

Can such a problem occur in large-sized drones (e.g., transportation applications)?

No, if they are properly tuned according to the instructions.