First things first, I'm new to the forums, so sorry if I got anything wrong. I have had KSP for a while now and have bad prety bad luck with SSTOs. I feel like this one has a chance, and it flies amazingly, but there's one problem. When I run out of intakeair, and need to switch the SABRE over to Rocket Mode, the spacecraft starts doing death flips:huh:. The COM is towards the back, but way in front of the COL. Although I don't trust COL measures with Pwings. It seems suspicious... I do not have FAR installed, by the way, unfortunately. My friend doesn't want it and we try to keep the same mods. Ill post the .craft if you think you need it, but here's some screenshots. http://prntscr.com/1q2rp7 http://prntscr.com/1q2s5c Thanks in advance, and apologies for my stupidity.