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LostCosmonaut

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Posts posted by LostCosmonaut

  1. However, one look at any of the forecast
    soundings shows how impressive/deep the stratospheric intrusion
    is/will be -- with the tropopause (the separation between the
    troposphere and stratosphere) expected to fall to as low as
    3kft- 4kft AGL this afternoon -- which is almost unheard of for
    these latitudes. This is what truly speaks to the rarity of this
    pattern that has evolved, even if daily records are not
    met/exceeded.
    

     

    https://forecast.weather.gov/product.php?site=NWS&issuedby=ILN&product=AFD&format=CI&version=3&glossary=1&highlight=off

     

    Stratosphere is getting ridiculously low

     

  2. Popular Mechanics interview with Musk on the BFR

     

    https://www.popularmechanics.com/space/rockets/a25953663/elon-musk-spacex-bfr-stainless-steel/

     



    On the windward side, what I want to do is have the first-ever regenerative heat shield. A double-walled stainless shell—like a stainless-steel sandwich, essentially, with two layers. You just need, essentially, two layers that are joined with stringers. You flow either fuel or water in between the sandwich layer, and then you have micro-perforations on the outside—very tiny perforations—and you essentially bleed water, or you could bleed fuel, through the micro-perforations on the outside. You wouldn’t see them unless you got up close. But you use transpiration cooling to cool the windward side of the rocket. So the whole thing will still look fully chrome, like this cocktail shaker in front of us. But one side will be double-walled and that serves a double purpose, which is to stiffen the structure of the vehicle so it does not suffer from the fate of the Atlas. You have a heat shield that serves double duty as structure.

    Yeah.

    To the best of my knowledge this has never been proposed before.

  3. I believe the KH-9 HEXAGON was the last one to use film canisters.

    1774a1.jpg

     

     

     

    Then they switched to electronic for KH-11, which looks not entirely unlike Hubble (there's speculation that the telescopes NRO donated to NASA were spare KH-11s).

     

    KH-10 was MOL/DORIAN, which never flew (random trivia fact; the first black astronaut selectee, Robert Lawrence Jr., was picked for MOL). Though I've also rarely seen DORIAN associated with other projects; http://www.nro.gov/Portals/65/documents/foia/declass/DORIAN/04-CONFIGURATIONS.PDF

     

    KH-10_Dorian_spacestation.jpg

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