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More tweets:6 test fires where the main chamber was lit, several with just the preburnerQ: "Is this with cryo or is there likely still another 10-20% performance bump possible?"A: Propellant was not deep cryo. CH4 & O2 were just barely below liquid temp at 1 bar. In theory, Raptor should do ~300 bar at deep cryo, provided everything holds together, which is far from certain. However, only 250 bar is needed for nominal operation of Starship/Super Heavy.Q: "Are you considering an extendable nozzle for Raptor at any time? Would love to see a nozzle that could extend during flight to provide extra ISP!"A: Yes, aiming for 380 sec Isp with vac nozzle. Maybe 382 if we get lucky.(I'm not sure if he means an extendable nozzle, or a nozzle extension. Nope, not an extendable nozzle.Q: "What cost per engine will you achieve, given similar comparison to Merlin? How many Raptors could you make per year given similar resources as you currently use for Merlin?"A: This will sound implausible, but I think there’s a path to build Starship / Super Heavy for less than Falcon 9Q: "Wow! I assume the switch to Stainless Steel is a big factor in this?"A: YesQ: "What are the estimated costs for tickets to Moon/Mars accounting for reusability?"A: Very dependent on volume, but I’m confident moving to Mars (return ticket is free) will one day cost less than $500k & maybe even below $100k. Low enough that most people in advanced economies could sell their home on Earth & move to Mars if they want.Q: "will it be cheaper than F9 for kg to LEO for instance?"A: At least 10X cheaperQ: "Is there ANYTHING we the public can do to help ?"A: The goodwill of the public is critical to Starship’s successQ: "What kind of outreach programs is spacex thinking for Starship? NASA inspired millions with Apollo."A: Just planning on keeping the public informed about progress & setbacks. Will be some RUDs along the way, but excitement is guaranteed!
A: Very dependent on volume, but I’m confident moving to Mars (return ticket is free) will one day cost less than $500k & maybe even below $100k. Low enough that most people in advanced economies could sell their home on Earth & move to Mars if they want.
Z tym się zupełnie nie zgadzam. Po co robić kolonie na Marsie? Jakoś na Ziemi ludzie się nie przeprowadzają, ani na pustynię, ani na biegun. Nikt tam nie buduje kolonii mimo, że byłoby to znacznie tańsze niż na Marsie. I ta cena 500k wydaje się śmiesznie mała, gdy sama podróż na ISS kosztuje 20-30 mln. dolarów.
Z biegiem lat, BGR robi się coraz mniejszy, bo z tego co pamiętam to pierwsze propozycje mówiły 450 ton na LEO, a teraz jest chociaż 100 ton? na końcu może się okazać że BFR będzie miał udźwig na LEO większy od FH, zaledwie o 20 może 30 ton.
Trwa odbudowa górnej części hoppera, zniszczonej miesiąc temu przez wichurę.