Ok, guys, had no time to play during the weekend, but i kept an eye on this thread. Thank you for you feedback, today managed to implement your suggestions I use mods to add new parts, mostly. Mechjeb for convinience . Stuff like Interstellar, FAR or Kethane just modify the gameplay itself too much for me. The Wings were not rotated in SPH. I know about the Lift issue if the wigs are rotated. So much theoretical knowledge about KSP from reading in the forums, the wiki and watching Scott Manley play, but not enough skill to actually use that knowledge About the last paragraph...read below. Done that in the X8. Kerbals were supposed to take a nap in the crew module if there's no maneuver to fly. Well, since my kerbals already managed to fly to Duna with the tiny and uncomfortable 3 man capsule, any development for increasing the quality of comfort during flight was therefore ditched due to resolve the now conflicting goals (managing to get into orbit vs. a nice flight wasn't much of a choice for me) Machjeb was only used to control keep pitch, heading and roll steady. Also, i used this intake mod to assign the intakes to the engines, so there are no suprises or assymentric flame outs. all left intakes are aligned to the left engine and vice versa. Now, here's what i did today: - removed the crew module - added another LF-Tank for the Jets - re-did the wings, as CoF/CoM was messed up - re-aligned the RCS-Thrusters The the rear landing gear was also moved a bit forwards and i fixed the action groups, because a few intakes where not toggled. These 2 things never bothered me me very much and i kept forgetting about it in the SPH. This time, i used the thottle to adjust my vertical speed, something i never did before. I always kept the throttle at 100% and used the pitch for this, which was not very accurate. Now, I had an eye on my ascend rate, acceleration and intake air and adjusted the trottle to keep it all in control. I was _so_ surprised by this: 1600m/s at 30 km with 0.20 intake air left iirc. I did 2 mistakes during the kick-out burn and quickloaded, but then i managed to get into an 260km circular orbit. YAY!!!!!! In space, i transferred a bit fuel back to the jets to have reserve, because i thought "you certainly mess up the timing to land!" I did. Re-Entry was somewhere above the desert west of KSC, during the flight back to the runway, fuel was about the run out, so i throttled up and down to keep my consumption rather low. After a while i thought "Well, now you don't need that much fuel....but your speed is as slow as your consumption!". Just before the runway, i got a surprise flameout on one jet and i landed nearby. I just 50m away from the runway. Cause of the Flameout: Assymetric fuel transfer. The other engine had 0.95 LF left, the flamed out one was dry. Who thought that this tiny amount of fuel might get important anyway? But hey, all survived and the did not end up at the other side of the planet! 1 flaw i still have: I needed to transfer fuel from my rocket to the jets during ascend, but before overhauling the design once again, i'll just experiment with more agressive flight profiles. I think i kept the vertical speed to 10-20 m/s to early. But once again, thank you for you tipps . God knows which revision of my SSTO would have made it into space if i wasn't asking you... the X40 could've become a christmas '15 present from me to myself