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demure's profile

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hubskier for: 2333 days

i live on coffee and stardust

recent comments, posts, and shares:
demure  ·  13 hours ago  ·  link  ·    ·  parent  ·  post: Pubski: February 19, 2020

I donated $20 to Elizabeth Warren's campaign today. Or tried to. ActBlue charged me 3 times. Would like to get it fixed, but I won't be too upset if they refuse.

Also donated $10 to Bernie. I still have a 2016 campaign poster of his kicking around somewhere.

demure  ·  26 days ago  ·  link  ·    ·  parent  ·  post: DirecTV fears explosion risk from satellite with damaged battery

Venting is required to mitigate the risk of accidental explosions (see pp. 14-15, particularly pp. 15 in the footnotes). Presumably there are fewer knock-on effects of an accidental explosion outside the parking orbit, though yeah, I'm also not quite clear why it needs to be vented prior to getting there.

Dirtward is no-go because of how fucking high geostationary orbit is. Way easier (in terms of delta-v) to boost it up 300 km than changing the perigee to something < 500 km (roughly the height of SpaceX's current Starlink sats, which will deorbit and burn in a few years at that altitude, thus mitigating space junk risk) from 35,786 km (geo orbit).

Edit: venting propellant prior to moving to parking orbit would mean less delta-v required to move the thing to parking orbit in the first place (less mass to move), so that's my educated guess...they might not have enough delta-v to get there without venting first.

dude you could pass the technician's ham license with a couple hour's studying. it'd probably take you less than a day to learn the material for the general. I bet you know most of it already--you'd only have to learn the regulation-related stuff.

demure  ·  52 days ago  ·  link  ·    ·  parent  ·  post: Los Angeles may force Uber to use electric vehicles, mayor says
demure  ·  58 days ago  ·  link  ·    ·  parent  ·  post: Some Christmastime carillon carols (performed by yours truly)


Duly noted.

The bells already have an intrinsic long ring to them (because if we remember a damper pedal on the piano, when pressed, lets the strings vibrate and die out naturally since it lifts the felts, whereas when it isn't pressed the felts will shorten the die-out time). Shortening their ring sounds terrible--you can do so by regulating the instrument poorly and it's just awful.

demure  ·  64 days ago  ·  link  ·    ·  parent  ·  post: Pubski: December 18, 2019

    There is only one Pubski left in this decade.


demure  ·  70 days ago  ·  link  ·    ·  parent  ·  post: San Francisco Hubski Meetup

a flattering portrait of two hubskiers met in realspace

demure  ·  70 days ago  ·  link  ·    ·  parent  ·  post: San Francisco Hubski Meetup

ah, right, good call.