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About RCgothic

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    Spacecraft Engineer
  1. If they can stick the landing with accuracy, maybe they'll be able to build a freshwater /de-ionised landing pool?
  2. Of course the poor dwell time of the hydrogen EUS means you won't be assembling anything in LEO, which limits SLS to small high energy payloads. It's basically useless for anything else.
  3. I think there's also a slight plane change manoeuvre required, which is cheaper at higher apoapsis.
  4. Can we back calculate what the maximum payload to the minimum GTO is and compare it to Spacex's stated values?
  5. Three: Even copper corrodes over cosmologically significant time periods (millions of years). Just because something is frozen does not mean it will remain intact and functional ready to be defrosted. I've some professional experience with trying to keep things protected over mere geologically significant time (tens of thousands of years) and I'd say the only hopes lie at a significant fraction of the speed of light. As we can't use the entire mass of the solar system as reaction material you are going to have to find a very large black hole with a shallow gravity well in a quiet neighbourhood (the less the black hole is consuming the lower the radiation/bombardment hazard) and slingshot very close to the event horizon. Of course, finding and travelling to such a black hole will take a cosmologically significant time period, so basically no. Not even a digitally stored simulation of a person's consciousness could be kept over that sort of time period.
  6. Thank you for clarifying.
  7. How is 'most reliable' and 'heavy' defined in that analysis? As far as I'm aware Saturn 1B had 100% success.
  8. Lift is a function of both wing area and velocity. A Cessna needs to go supersonic. Something built like a U2 would not.
  9. Still doesn't make sense. Orion is massively over engineered for trips to LEO which for the foreseeable is the most sensible place to assemble the mars mothership. It's rated for lunar returns. In that respect it's well suited for DSG, but DSG is just make-work. DSG isn't a sensible assembly location because it takes more propellant to send assembly materials to DSG and then to mars than it does to just send straight to mars from LEO. There are still no serious plans to revisit the lunar surface. As far as Martian returns go, the Orion is a heavy piece of hardware you don't want to take with you. On return the mothership is expensive enough that you're going to brake it into LEO rather than lose it and re-enter direct from Mars in an Orion whilst losing the rest of the ship.
  10. Orion isn't designed to go to Mars. It has nowhere near the required habitable volume for that duration. Neither is SLS - it can't loft nearly enough propellant for a crewed mission to mars and the hydrogen upper stage doesn't have the endurance for on-orbit assembly at the proposed launch cadence. Nasa does not yet have a serious plan to get there and the hardware required is currently all vapourware.
  11. Also, though it didn't have any loss of craft, Saturn and Apollo had several very near misses. If it had kept flying there'd probably have been a tragedy. It was an amazing machine, but let's not pretend it was perfect. A new booster would have better payload fraction and better safety margins for lower cost than resurrecting the dead. Not that SLS is the right approach either.
  12. Remembered and tuned in at t-5! Very lucky!
  13. I'm up to bag 5/6. Stage IC nearly complete! It's nice and solid, but I'm a little disappointed the interstage ring remains attached to SIC. I'm already pondering if I can alter it to be a separate piece. Just the F1s let to do! Also noticed looking ahead that for the command module you have to swap between the Boost Protective Cover version and the one without. Guess they don't have a hollow piece to go over the top of a cone piece!
  14. Presumably the ICPS does make a difference for less than full payloads to beyond LEO. But that is ridiculous. As if we needed more reason to diss the SLS.
  15. Very little unless it launches with the payload or can rendezvous with it very shortly thereafter.