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NickSzabo4's profile
Nick Szabo 🔑
Nick Szabo 🔑
Nick Szabo  🔑
@NickSzabo4

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Nick Szabo  🔑

@NickSzabo4

Blockchain, cryptocurrency, and smart contracts pioneer. (RT/Fav/Follow does not imply endorsement). Blog: http://unenumerated.blogspot.com 

Joined June 2014

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    1. Andrew Doull‏ @andrewdoull Jan 15
      • Report Tweet

      Wondering what the best carbon allotrope to refuel rockets at Venus is.

      3 replies 1 retweet 3 likes
    2. Chris (Robotbeat) 🗽 🖖🏾‏ @Robotbeat Jan 16
      • Report Tweet
      Replying to @andrewdoull @nyrath

      Carbon monoxide/oxygen makes a good fuel/oxidizer combo. Gonna rest the technology on Mars in 2020 if this shutdown ever ends.

      1 reply 2 retweets 5 likes
    3. ToughSF‏ @ToughSf Jan 16
      • Report Tweet
      Replying to @Robotbeat @andrewdoull @nyrath

      The Isp though leads to challenging mass ratios.

      1 reply 0 retweets 0 likes
    4. Chris (Robotbeat) 🗽 🖖🏾‏ @Robotbeat Jan 16
      • Report Tweet
      Replying to @ToughSf @andrewdoull @nyrath

      Not as bad as you might think! Isp is over 300s with a pumpfed vacuum engine, which is better than Earth sea level with most propellants. Density is good, and it actually takes significantly less energy to produce than higher Isp propellants. It’s OPTIMAL for Mars orbit, in fact.

      1 reply 1 retweet 5 likes
    5. Chris (Robotbeat) 🗽 🖖🏾‏ @Robotbeat Jan 16
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      Replying to @Robotbeat @ToughSf and

      If you are energy-limited (as you usually are w/ ISRU propellants), then you need to be careful not to pick a propellant with too high exhaust velocity (Isp). So a low Isp propellant can actually be MORE energy efficient than a hi Isp one. A counterintuitive result often ignored.

      3 replies 2 retweets 10 likes
      Nick Szabo  🔑‏ @NickSzabo4 Jan 16
      • Report Tweet
      Replying to @Robotbeat @ToughSf and

      +1 Most don't realize the economics become radically different than those of launching propellant out of earth's gravity well.

      11:13 AM - 16 Jan 2019
      • 3 Likes
      • Flightcrew 🇺🇸 Riding Unicorns to the Moon ToughSF
      0 replies 0 retweets 3 likes

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