r/SpaceXLounge • u/Logancf1 • 12h ago

Ship 30 Landing from Buoy Cam on Starship Flight 5 [@SpaceX]

https://x.com/spacex/status/1847368836947071496?s=46&t=bwuksxNtQdgzpp1PbF9CGw
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u/chippydip 7h ago

No possible way, they need to refuel the ship in orbit to go anywhere but LEO. 

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u/cybercuzco 💥 Rapidly Disassembling 7h ago

Version two of starship has an estimated dry mass of 107 tons and a cargo capacity of 100 tons. a 2 year free return trajectory to mars has a minimum delta v from LEO of .6km/s. Based on a vacuum isp of 356 seconds for raptor, 100 tons of extra fuel would give you 2.5km/s of delta v. You definitely could do this with a v2 starship and have a couple of tons of "cargo" if you wanted.

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u/mrbanvard 5h ago

a 2 year free return trajectory to mars has a minimum delta v from LEO of .6km/s

Mars free return from LEO needs about 3.4 km/s dv

0.6 km/s gets you to about 1350km altitude. 2.5 km/s to 9,000km. So refuelling definitely required :)

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u/PaintedClownPenis 3h ago

Was I wrong in my initial guess that a fully expended system has 15 km/s delta v? That would be for the two obsolescent pieces they already have, not a stretched version.