⟨13nickttd⟩ Damn I couldn't take a screenshot. I experienced some weird issue where I deployed my second stage correctly, it was a 3x AJ10 with about 7100m/s, burn time on mechjeb was about 24mins) I planned a mars ejection burn with TWP and I needed around 3600m/s, launched into the correct inclination and LAN, (My orbit lined up with the ejection vector when I hit the button to show it) And I did manage to create the maneuver with the correct 3600m/s and got a 10km periapsis on mars. However, this is where things go wrong, I hit the "Active Engines" button in principia and after optimizing my maneuvre I needed 4100m/s and like a 40??? minute burn to do it, did I miss something or has anyone experienced something similar? I guessed my TWR was way too low and making me loose efficiency but it was about 0.2 so it's not that bad for a vacuum stage?