DerekL1963

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About DerekL1963

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    Rocket Scientist

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  1. DerekL1963

    NASA SLS/Orion/Payloads

    Which must be balanced against the increased risks of multiple launches, rendezvouses, and assembly operations. TANSTAAFL no matter how hard you keep trying to handwave one into existence.
  2. DerekL1963

    NASA SLS/Orion/Payloads

    Yeah, let's "save" money by making our payload development and construction much more complicated, by increased mission risks in the form of orbital assembly and/or refueling, etc... etc... Or, to put it another way. No. You cannot "just" use multiple flights. It doesn't work that way. Rule of thumb: Everything gains in mass as it moves from paper to bending metal.
  3. If you're sending a heavy payload to any destination via NTR... it kind of defeats the purpose to have to deploy infrastructure via conventional means that costs 10x as much. No, the hardest part to find are solutions that are actually practical rather than just hand waving without having actually been thought through.
  4. 0.o Yes, mass matters once you are in space.
  5. ISP doesn't deliver payloads - total vehicle performance does. And in that respect nuclear powered spacecraft suffer heavily from the weight of the reactor and the dry mass of the LH2 tanks.
  6. DerekL1963

    The Debate of Solid vs Liquid

    Soviet submariners were not volunteers, and had little choice in the matter. I don't know about Russian practice. But also keep in mind that the birds are confined to and isolated in their launch tubes.
  7. DerekL1963

    Elon Musk and the NTSB

    0.o What color is the sky in your world where changes in automobile engineering haven't reduced deaths in accidents? Did you even read the report I linked and the paragraph I specifically pointed out?
  8. DerekL1963

    For Questions That Don't Merit Their Own Thread

    Nobody cares what your definition is. The math shows it to be wrong.
  9. DerekL1963

    Elon Musk and the NTSB

    Hint: I didn't ask if it had anything to do with cars - I asked why the numbers have steadily fallen over time if they aren't controllable. These are two entirely different questions. Not to mention, did you not note the difference between the period covered in the graph and the period covered in the report? This is probably the report you meant to link to to, and note the first paragraph of the conclusions https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/556406/rrcgb2015-02.pdf
  10. DerekL1963

    For Questions That Don't Merit Their Own Thread

    The area of a circle is 2(pi)r2. Area of a circle of size 1 = 1. Area of a circle of size 2 = 12. So, no. Two half size screws are not equivalent to a single full size screw - because of that exponent.
  11. DerekL1963

    Elon Musk and the NTSB

    If this were true - then why does your first graph show a steady descent?
  12. DerekL1963

    The Debate of Solid vs Liquid

    Not quite true. Solids can last a long time, but not indefinitely.
  13. DerekL1963

    Landing spaceplanes on Duna.

    You can also use a Sandbox save and the Hyperedit mod and practice on Laythe itself. That's how I do all of my engineering development.
  14. DerekL1963

    The Debate of Solid vs Liquid

    Yeah, so you did. I misread, mea culpa.