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Submitted by
Drew Kime
Drew Kime writes "For at least the past hour I haven't been able to connect to my Blogger-hosted blog. If my stats on Google Analytics are up to date, no one has hit the site for at least two hours. (And I average over a hundred per hour this time of day.)

I tried to check the official Blogger status. Ironic error message: "Your request for http://status.blogger.com/ could not be fulfilled, because the connection to status.blogger.com (72.14.207.121) could not be established." Well, I guess that tells me the status. It seems they host their official status blog on the same server or cluster that hosts *my* blog.

I wonder when something will show up in Google News."

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Comment: Re:Iron Man's Suit Defies Physics -- Mostly (Score 2, Interesting) 279

by John Carmack (#23266718) Attached to: The Science of Iron Man
Hydrogen peroxide powered rocket packs fly for around 30 seconds, because they have a specific impulse of around 125, meaning that one pound of propellant can make 125 pound-seconds of thrust, meaning that it takes about two pounds of propellant for every second you are in the air. Mass ratios are low for anything strapped to a human, so the exponential nature of the rocket equation can be safely ignored.

A pretty hot (both literally and figuratively) bipropellant rocket could manage about twice the specific impulse, and you could carry somewhat heavier tanks, but two minutes of flight on a rocket pack is probably about the upper limit with conventional propellants.

However, an actual jet pack that used atmospheric oxygen could have an Isp ten times higher, allowing theoretical flights of fifteen minutes or so. Here, it really is a matter of technical development, since jet engines have thrust to weight ratios too low to make it practical. There is movement on this technical front, but it will still take a while.

John Carmack

Waste not, get your budget cut next year.

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