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DanielleFong's profile
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@DanielleFong

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@DanielleFong

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Empire of the Future
Joined February 2008

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    1. Chris Bergin - NSF‏Verified account @NASASpaceflight 9 Mar 2021

      Chris Bergin - NSF Retweeted Elon Musk

      This is a tricky one given that I believe said helium pressurization was added to the CH4 header tank to mitigate what happened with SN8. That's why it's a test program, of course.https://twitter.com/elonmusk/status/1369379914139451406 …

      Chris Bergin - NSF added,

      Elon MuskVerified account @elonmusk
      Replying to @austinbarnard45
      SN10 engine was low on thrust due (probably) to partial helium ingestion from fuel header tank. Impact of 10m/s crushed legs & part of skirt. Multiple fixes in work for SN11.
      78 replies 196 retweets 5,504 likes
    2. Elon Musk‏Verified account @elonmusk 9 Mar 2021
      Replying to @NASASpaceflight

      Fair point. If autogenous pressurization had been used, CH4 bubbles would most likely have reverted to liquid. Helium in header was used to prevent ullage collapse from slosh, which happened in prior flight. My fault for approving. Sounded good at the time.

      505 replies 460 retweets 11,010 likes
    3. Everyday Astronaut‏Verified account @Erdayastronaut 9 Mar 2021
      Replying to @elonmusk @NASASpaceflight

      Are there baffles in future designs to prevent slosh?

      36 replies 31 retweets 1,986 likes
    4. Elon Musk‏Verified account @elonmusk 9 Mar 2021
      Replying to @Erdayastronaut @NASASpaceflight

      There were baffles, but one may have acted like a straw to suck bubbles in from above liquid/gas level. Something similar happened on an early Falcon 1 flight, resulting in unexpectedly high liquid oxygen residuals at main engine cutoff.

      169 replies 192 retweets 4,315 likes
    5. Toby Li‏ @tobyliiiiiiiiii 9 Mar 2021
      Replying to @elonmusk @Erdayastronaut @NASASpaceflight

      Has the SpaceX team concluded with a better landing leg design for Starship?

      10 replies 15 retweets 1,031 likes
    6. Elon Musk‏Verified account @elonmusk 9 Mar 2021
      Replying to @tobyliiiiiiiiii @Erdayastronaut @NASASpaceflight

      Might just catch the ship with the launch tower, same as booster

      545 replies 245 retweets 5,005 likes
    7. Everyday Astronaut‏Verified account @Erdayastronaut 9 Mar 2021
      Replying to @elonmusk @tobyliiiiiiiiii @NASASpaceflight

      Starship’s belly flop terminal velocity is already only like 75 m/s... what if... remove the 30 tones of landing prop, add 10 more tones of flaps, get that down to like 50 m/s and just use the world’s largest and most ridiculous net? 😂🤷‍♂️

      96 replies 41 retweets 2,209 likes
    8. Elon Musk‏Verified account @elonmusk 9 Mar 2021
      Replying to @Erdayastronaut @tobyliiiiiiiiii @NASASpaceflight

      Yeah, we talked about that internally. Could just have it land on a big net or bouncy castle. Lacks dignity, but would work. But, optimized landing propellant is only ~5% of dry mass, so it’s not a gamechanger.

      553 replies 266 retweets 6,580 likes
       🤷🏻‍♀️‏ @DanielleFong 9 Mar 2021
      Replying to @elonmusk @Erdayastronaut and

      (wondering) how it compared to payload to orbit so i did some calcs, starship payload to orbit 100+t, starship 1200t, superheavy 3400t propellant dry weight (i’m guessing a great 20 mass ratio -> 230t? 5% of that is 11.5t, so maybe 10% of payload, maybe dignity is worth it

      7:42 PM - 9 Mar 2021
      • 1 Like
      • ˗ˏˋ Hugo Lpz 羅禹國 ˎˊ˗
      2 replies 0 retweets 1 like
        1. sean costello‏ @solarPVsean 10 Mar 2021
          Replying to @DanielleFong @elonmusk and

          Why not just float up a small rocket attached to a helium balloon ?

          0 replies 0 retweets 0 likes
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