I would, but I don't think I can respect someone who doesn't use delta-v, instead opting for some arbitrary "2 kg payload per liter fuel" Just kidding (though the inner astrophysicist in me does want to strangle you ). The only thing I need to do my turn is the mass of fuel per liter, so I can start designing my spacecraft. EDIT: The bay12 thread uses a density of 1 kg/l, gimme a sec to design a rocket. EDIT2: Halfway through the rocket design, and I've realised that your method which I decried earlier is actually much more fun that a purely scientific approach. I agree with you now EDIT3: My completed turn: Research None Design I want to design this rocket, the Korabl-Odin It has a mass of 1975kg, a cost of ¤800, and a payload to LEO of 275kg. That's ¤2900 per ton, which is the absolute maximum with my present technology. This will cost ¤2800 to design, due to the ¤2000 design cost + the cost of the rocket. Construction I spend ¤5000 on upgrading mission control to get an extra flight per year. This brings my budget down to ¤2200, but it brings my assets up one design and up a mission control . Hope I did this turn post correctly, I'm new to this .