This English translation of Dmitry Rogozin's comments on Crew Dragon is something. My favorite part is his comparison of Soyuz to Renaissance artists. "In the same manner the paintings by Leonardo da Vinci, Michelangelo, and Titian are priceless..." http://en.roscosmos.ru/21511/
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Replying to @SciGuySpace
Quite a piece! I should credit Soviet/Russian engine work in the 80’s as being a factor in deciding to switch from H2 to CH4. They demonstrated excellent performance on test stands, with Isp up to 380 secs.
77 replies 182 retweets 3,365 likes -
Replying to @elonmusk @SciGuySpace
Combined with SpaceX deep subcooling of propellants to near liquefaction temp of N2, use of common dome (CH4 & O2 liquid at similar temps) & higher T/W of engines enables de facto higher delta-V than an H2/O2 stage
41 replies 68 retweets 1,308 likes -
Replying to @elonmusk @SciGuySpace
What ever happened to Raptor upperstage for FH? I assume it’s higher TWR and higher min throttle would crush about any payload, and adding another prop / manufacturing complexity wouldn’t likely be worth it. But there sure were talks of it for a while with the Air Force.
8 replies 8 retweets 323 likes -
Is Starship expected to be so cheap that a FH w/Raptor is pointless?
1 reply 4 retweets 111 likes -
Definitely. Starship will make about anything else pointless. It’ll be cheaper to fly than the Falcon 1 even (eventually). It might take a few more years to get to thay point, but when it works out as planned it’ll be orders of magnitude cheaper.
9 replies 34 retweets 1,003 likes -
Exactly. Chartering a dedicated 747 flight around the world costs less than buying a small, single engine turboprop plane. In the same way, a giant reusable rocket flight is way cheaper than a tiny expendable rocket that can be used only once.
98 replies 167 retweets 2,818 likes
Yeah I’ve been hoping for this!
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