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View Diary: Who can own the future? (262 comments)

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  •  Well, I don't know about a single refridgerator (0+ / 0-)

    To get to 7 9's in 20 light years would take almost a month of shipboard time, but more distressingly would require a continuous acceleration of over 200g's (or over 400g's if you intend to arrive at your destination rather than cleave a chunk off the planet it's on).

    I can't see soufflés surviving that one.

    Yeah, Tsiolkovsky's equation is a cruel master.  Trouble with a Bussard ramjet (pick up fuel as you go along) is that 4p -> He reactions are really, really slow (ask the Sun, it's been at it for billions of years and has only gotten about halfway through so far) so it'd have miniscule efficiency, and then the CNO cycle would inevitably lose catalyzation atoms in the exhaust.  The only realistic way you could get it to work is to slow down the collected protons, take your time reacting them in a 4p -> He manner, then point the result out.  Since the energy release for this is about 7%, then before accounting for neutrinos or any other inefficiencies the best you could do for your ramjet would be to achieve a γ of about 1.07, or v = .35c.

    Fake candidates nominated by the GOP for the recalls: 6 out of 7. Fake signatures on the recall petitions: 4 out of 1,860,283.

    by GeoffT on Tue Jul 16, 2013 at 01:14:46 PM PDT

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