@FreeThinker Debug Problem: [1] I believe that with those two vessels, that I uploaded, its easier to detect the problem. One work perfectly and the other is a night mare: OK: GOOD.craft BAD: bug.craft   New Release: [2] The new engine is super useful, adopted it already into the new space2.craft Shared here: https://www.dropbox.com/s/f4g54ydw1y2n40n/SPH.zip?dl=0 (the 3 vessels) The first test flight with it was this one: