Timeline for engineer list by rozzin, page 64
rozzin
engineer
Thursday, 29-Nov-0001 19:00:00 EST
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@arthur I mean *world*, not Internet--I fixed that lock so you don't need to worry about the big world outside.
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OK, @arthur: I just fixed that lock so the world can't get into the garden. And also so you can't escape the garden into the big Internet.
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Whoah. Thanks for finding that hole and reporting it! Good doge! #fulldisclosure
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@rozzin @palmella the gate is unlocked! It's all ONE BIG YARD OUTSIDE NOW! And OUTSIDE IS REALLY BIG NOW! I'M SCARED! TOO MUCH FREEDOM!
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@arthur, how the hell did you get out front? Didn't @palmella let you out into the *back* yard!?
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... so, I guess this past !gravmass ended up teaching us a little about chemistry in addition to physics ☺
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Estes "Sonic igniter" all-fire current is spec'd as *4 Amps*. Cold-weather !rocket launch seems to be its own set of interesting problems.
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Interestingly, the modern Estes !rocket "starters" are spec'd as having an all-fire current of *2 Amps*, and my lithium 9V peaks at 1.2A. I'm assuming Estes figures are conservative....
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@cmhobbs, "smoke alarm battery", by comparison, gave reliable ignition even below 40°F: https://www.ultralifecorporation.com/ecommerce/CatalogItemDetail.aspx?CID=56&IID=628
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@cmhobbs, IIRC it was ~55°F for the Grav-Mass launch (unusually warm!), and the only successful ignitions were from the batteries that were still warm from having been in my pocket.
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@cmhobbs, alkaline 9V in the launch controller failed to push enough current through the igniter wire to heat it up and ignite the BP motor.
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We did a !rocket launch for !gravmass (to engage all 3 laws), and learned that alkaline #batteries don't cut it below something like 60°F ☹
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Pretty good !rocket launch w/ @nanohacker, today; chilly outside, but no problems blasting off--hooray for lithium batteries!
Joshua Judson Rosen
Arthur Joseph
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