Matias Saibene
Development hell
My God!View attachment 35189
Well, just using the visual helpers, your total engine thrust is over 3 MN, it should not be more than 720 kN or 0.72 MN with afterburner.
The weight is 2.369 MN which seems about right for maximum weight.
Generally it feels like the controls are all crossed up. Trying to roll right rolls the vessel to the left, etc. I modified the scenario to start while airborne, and it is extremely unstable. I think you have some flight control surfaces set up forward of the center of pressure and it really wants to fly backwards because of it. I don't know if you are trying to implement the canards but if so they seem to be overpowering the wings and tail surfaces.
There seems to be a problem with your contact point definitions:
View attachment 35190
You also seem to have some spurious forces acting at the wheel contacts which don't seem to be doing good things.
I do not know where to start. Well first thank you for your patience and time to test my defective Valkyrie. I'm going to fix all this because it's a real mess. Thanks to your test I can know where to start: rewriting all the code. Anyway I'm going to keep the current code in another directory just in case.
By the way, did I correctly implement the data from the lift coefficient table?
Thank you again very much for your help.