Thank you for the quick reply! I will definitely go back to testing in "gimbal mode". After playing around with the COM some more I managed to at least resolve most instabilities (where all the drag and lifts where spinning around the wings and stabilizers like crazy). My next problem is that I am nowhere near generating enough thrust and/or lift. The wing area is as close as I can get it to the real spitfire so I would like to leave that to it's "authentic" values, thus I feel like my focus should be on the propellor.
The real propellor could run to about ~3000 RPM on emergency power, translating to around 314 rad/s angular velocity. The interesting thing is, and I'm sure this is due to my lack of knowledge and inexperience with aerodynamics, that whilst the propellor generates more lift at that angular velocity it actually starts generating lift the other way making my plane reverse. At lower angular velocity, the propellor does generate lift into the forward direction of the plane. I have replicated the propellor from one of the transport airplane, using a hinge joint. I'll definitely experiment around some more, but if you have an idea on why this happening and how to solve it, I would greatly appreciate it! I wouldn't be surprised if I'm actually running into a Unity physics limitation/instability (I have tried at 1/90fps fixed time step)
