... some secondary forces like tail and main rotor moments that worked when they don't suppose to. Not sure why it became noticeable just now, I didn't make much changes in dynamic forces.
It's that pesky butterfly doing its wing-flapping thing!
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It's great that you have some success with undercarriage, because all my tryings to make it better end with worst result.
This was after I realised that I had mis-read the file and given the helis some very springy tails instead. I can try a few more tweaks and proper testing because what seems fine before take off might just make landings more interesting than they are supposed to be... I can post specific details once I am sure it doesn't break everything.