Hey there Have a question: I think I will manage to bring the buran with the ISS-Zarya module into a 100km orbit (my last curve was not really good, so i made a 17km periapsis); But as the ISS does orbit the earth in about 400km, I also wanted to do the same in ksp. How can I change the fuel/weight ratio of the Buran rocket to be able to make a 400km orbit, without adding rockets or other stuff? Of course, the only stuff is my cargo, the Zarya, or other modules. thanks very much! EDIT: got a proton-k with zarya into a 400km orbit... I changed the CFGs from the first two stages of the proton rocket, to get a delta-v from about 6500m/s. I also was able to bring all the debris back to kerbin