Excuses, Excuses

Sorry guys, I said I’d post the second half of that thought today (the one about how to use dual-launched EELVs for manned missions).  But I’m exhausted.  Been doing far too many cycles of stay up till 1am, then get up at 6:30 or 7am over the past two weeks.  I’m going to bed.  Hopefully I can get my thoughts written up tomorrow.  Sorry.

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Jonathan Goff

Jonathan Goff

President/CEO at Altius Space Machines
Jonathan Goff is a space technologist, inventor, and serial space entrepreneur who created the Selenian Boondocks blog. Jon was a co-founder of Masten Space Systems, and is the founder and CEO of Altius Space Machines, a space robotics startup in Broomfield, CO. His family includes his wife, Tiffany, and five boys: Jarom (deceased), Jonathan, James, Peter, and Andrew. Jon has a BS in Manufacturing Engineering (1999) and an MS in Mechanical Engineering (2007) from Brigham Young University, and served an LDS proselytizing mission in Olongapo, Philippines from 2000-2002.
Jonathan Goff

About Jonathan Goff

Jonathan Goff is a space technologist, inventor, and serial space entrepreneur who created the Selenian Boondocks blog. Jon was a co-founder of Masten Space Systems, and is the founder and CEO of Altius Space Machines, a space robotics startup in Broomfield, CO. His family includes his wife, Tiffany, and five boys: Jarom (deceased), Jonathan, James, Peter, and Andrew. Jon has a BS in Manufacturing Engineering (1999) and an MS in Mechanical Engineering (2007) from Brigham Young University, and served an LDS proselytizing mission in Olongapo, Philippines from 2000-2002.
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7 Responses to Excuses, Excuses

  1. MG says:

    Jon,

    Sleep. That helps you stay safer at your industrial site.

    The blog can wait.

  2. Bill White says:

    A fascinating thought from NSF . . .

    What would the Delta IV numbers be if they switched to a pair of SSME rather than the RS-68?

    Has anyone ever looked closely into whether RS-68 truly offers more economical performance?

  3. Bill,
    I’m sure the performance would improve a bit…but man, that would be expensive. I don’t believe for a second that switching to SSMEs would make Delta-IV more economical.

    ~Jon

  4. MG says:

    What would get reused? The tanks? It would no longer be a Delta IV.

  5. Bill White says:

    Actually, the question is whether the SSME (if produced in quantity) truly is as expensive as urban legend supposes.

    SSME is just “too expensive” kinda has a “known fact” quality to it that just might not be true.

  6. Bill,
    I’d really believe that an engine running as close to the edge as the SSME would be more expensive than an RS-68. Even if DIRECT were around, and even if their magical SSME costs came into being, two SSMEs are still going to be substantially more expensive than one RS-68. And I don’t think the added performance would make up for it–though I might be wrong.

    ~Jon

  7. MG says:

    Well, there *is* the whole “system” aspect that has to be considered. If SSME enables a mission with existing (or lightly modified) hardware, and RS-68 requires a significant increase in changes over SSME, then the engine expense is just one element.

    This, at least, is what I understand the DIRECT folks’ argument to be regarding RS-68 vs. SSME.

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