ORBITER-FORUM will be temporarily closed at 2026-07-23 18:00 UTC while we complete some OF maintenance tasks. The amount of downtime is expected to take up to one hour, but probably less.


Work on the inline alternative is underway. I'm putting the numbers together. It is a radical changecool now were is the Rocket?


The HES upper stage will remain!NOICE!
you could also do a prtially reusable config with HES-5 upperstage
LH2 is really good for high engergy upper stage, while CH4 is good for first stages because of the high desity