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One think to note is that if you use cryogenic proplants for your lander or lunar tug, you might face issues with fuel and oxidizer boiling off over time (unles
by m4rtink 6y ago
One think to note is that if you use cryogenic proplants for your lander or lunar tug, you might face issues with fuel and oxidizer boiling off over time (unless you go for very good isolation or use active cooling, both rather heavy), reducing your time window to have everything launched & used.
You can opt for hypergolic propellants that won't boil off, but you sacrifice performance and make ground handling more expensive and dangerous due to these being highly toxic.
- rbanffy 6y agoYou can use cryogenics for the landers and depots that don't stay parked in lunar orbit for long, but any assets with long shelf life should use hypergolics. And now my mission profile has two different landing modules, one using cryogenics, one using hypergolics. Oh well... We can always go hypergolic if the mass budget is not a big issue.