Hello, nice aircraft have been modelled, they're a pleasure to fly.
I'm unable to find info from manuals, if following is expected behaviour:
Altitude hold cannot be engaged with ALT mode preselected, at preset altitude, even on a properly trimmed a/c. Instead, attitude mode has to be engaged, beforehand. Video reference 1: https://www.twitch.tv/videos/2688064207 ATT mode is used around 2:45 mark.
There is porpoising/hunting in some performance conditions. Video ref 2: https://www.twitch.tv/videos/2688064200 Video ref 3: https://www.twitch.tv/videos/2686403662
I've read the FAQ's part about GPS packages. I don't have axis controls for the AP.
This behaviour seems to exist on both v0.1.2 Dukes on FS24 SU4