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Total Eclipse of the Hard

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Comments

  • BotchBotch Posts: 9,828
    It was a design failure.  There are better O-rings now, like Viton (sp?).  I have used those in some analytical instruments where there are extremely challenging conditions of temp.

    But the design was at fault, mostly the culture, as the problem was known, they measured the "safety factor" completely incorrectly, management over-rode engineering warnings, etc.  Same ol' same ol'. 

    Viton probably wouldn't have failed, but the design of the assemblies encouraged the failure to be catastrophic.
    There ARE better O-rings now, but that has nothing to do with it.  The joint design was faulty, and NO o-ring could withstand the direct pressure/heat inside an RSRM during burn.  
    The old design was (to use a woodworking analogy) a "Tongue-in-groove", which "bent" when the booster shells were pressurized (dang this would be so much easier with pictures).  The new design was a double tongue-in-groove (again, wish I had a pic) which sealed itself under pressure, in fact the o-rings in the new design were more for ease of assembly, they were not required for flight at all.  
    What's not commonly known is that a few other subsystems were "borderline" too when Challenger bit it; for instance the hydrogen/oxygen engines in the Shuttle itself were occasionally throwing turbine blades on the test stand.  Many things were redesigned/qualified during the RSRM redesign effort.  
    I worked in the Safety/Reliability section of Thiokol from '97 to '99, right after the Shuttle began flying again, and learned an awful lot of neat history in that short time.  I highly recommend "Truth, LIes and O-Rings" by McDonald, one of the senior engineers at Thiokol at the time.  
    ____________________________________________
    Introvert Engineers - Social Distancing before it was cool.  
    Ogden, Utard.  
  • BotchBotch Posts: 9,828

    ive built some pretty high tech things over the years with orings, high pressure and extremely low vacuum. its usually something stupid that makes them leak like a guy dragging a 10 foot oring across a floor in a clean room thinking nothing of it
    I visited the location in the former Ogden Depot where a couple of my coworkers would pull the booster segments apart, and painstakingly pull out the used o-rings, measure them, and also measure any blow-by stains on the metal booster segments; they even used feeler gauges on one measurement (although I can't remember exactly what).  Tedious work!  
    ____________________________________________
    Introvert Engineers - Social Distancing before it was cool.  
    Ogden, Utard.  
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    Couple of pics of the mountain house we're staying at:


    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    Tenderloin came out ok, I guess:  




    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    A slider:



    @Eggcelsior 's tiger sauce is legit!
    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • milesvdustinmilesvdustin Posts: 2,896
    Why is everyone saying kentucky has max totality when the websites say illinois? 

    2 LBGE, Blackstone 36, Jumbo Joe

    Egging in Southern Illinois (Marion)

  • lousubcaplousubcap Posts: 21,567
    @JohnInCarolina -  time to get back to your regularly scheduled forum stirring mode.  That slider with the main course is an outcome fit for the eclipse and you are just getting ready to go dark.  Great banquet right there.  
    Louisville; "indeterminate Jim" here; L&S BGE's, PBC, Lang 36; burnin wood in the neighbourhood. # 38 for the win.  Life is too short for light/lite beer!
  • theyolksonyoutheyolksonyou Posts: 18,081
    Tenderloin came out ok, I guess:  




    I can't quite place it, but this reminds me of something ...
    Jason NW GA- home of carpet and Mexican restaurants
    LBGE, MM, BS (Blackstone and the other kind)
    One sorry Labrador

    My chili did not suck. My wings either. 
  • jeffwitjeffwit Posts: 1,348
    Tenderloin came out ok, I guess:  




    I can't quite place it, but this reminds me of something ...
    Does it hurt when you pee?
    Jefferson, GA
    XL BGE, MM, Things to flip meat over and stuff
    Wife, 3 kids, 5 dogs, 4 cats, 12 chickens, 2 goats, 2 pigs. 
    “Honey, we bought a farm.”
  • henapplehenapple Posts: 16,017
    Is that Britney Spears? 
    Green egg, dead animal and alcohol. The "Boro".. TN 
  • nolaeggheadnolaegghead Posts: 33,269
    ______________________________________________
    This is my signature line just so you're not confused.  Love me or hate me, I am forum Marmite.
    Large and Medium BGE, Kamado Joe Jr, Akorn Jr, smoker with a 5k btu AC, gas grill, fire pit, pack of angry cats, two turntables and a microphone, my friend.  Registered republican.
    New Orleans, LA - we know how to eat 

  • theyolksonyoutheyolksonyou Posts: 18,081

    @texaswig exploiting the solar pattern 
    Jason NW GA- home of carpet and Mexican restaurants
    LBGE, MM, BS (Blackstone and the other kind)
    One sorry Labrador

    My chili did not suck. My wings either. 
  • texaswigtexaswig Posts: 2,356
    @theyolksonyou....  murder van is the gift that keeps giving. Its just so versatile. 
    Scott
    Greenville ,Tx

    Xl bge with woo2 and ajustable rack
  • LegumeLegume Posts: 10,583
    Shoulda used prime rib, a man's cut.
  • GATravellerGATraveller Posts: 7,820
    Can you see the sky from the deck? 

    "Social media gives legions of idiots the right to speak when they once only spoke at a bar after a glass of wine, without harming the community [...] but now they have the same right to speak as a Nobel Prize winner. It's the invasion of the idiots."

                                                                                  -Umberto Eco

    2 Large
    Peachtree Corners, GA
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    Can you see the sky from the deck? 
    No we'll be driving a bit north.  There's a big party being put together on this huge lawn in front of a school.
    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • GATravellerGATraveller Posts: 7,820
    Hope we all get a clear sky. I better track down some glasses by then. Nothing like waiting till the last minute. 

    "Social media gives legions of idiots the right to speak when they once only spoke at a bar after a glass of wine, without harming the community [...] but now they have the same right to speak as a Nobel Prize winner. It's the invasion of the idiots."

                                                                                  -Umberto Eco

    2 Large
    Peachtree Corners, GA
  • BotchBotch Posts: 9,828
    Hope we all get a clear sky. I better track down some glasses by then. Nothing like waiting till the last minute. 
    Good luck, I've given up (refuse to patronize a scalper).  
    ____________________________________________
    Introvert Engineers - Social Distancing before it was cool.  
    Ogden, Utard.  
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    edited August 2017
    Took a hike out to see the local waterfalls.  It's really very pretty around here:


    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • thetrimthetrim Posts: 10,577
    Does anyone remember the forum member that was a self proclaimed astronomy geek.  He has some ridiculously bad a$$ telescope and took some amazing pictures with it?  I'd love to see what he has going tomorrow.
    =======================================
    XL 6/06, Mini 6/12, L 10/12, Mini #2 12/14 MiniMax 3/16
    Tampa Bay, FL
    EIB 6 Oct 95
  • thetrimthetrim Posts: 10,577
    @JohnInCarolina are you in North GA?  I think I saw "Angel Falls" a couple years ago up there.  I'm sure there's only about 1,00 falls of that name in the country.
    =======================================
    XL 6/06, Mini 6/12, L 10/12, Mini #2 12/14 MiniMax 3/16
    Tampa Bay, FL
    EIB 6 Oct 95
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    thetrim said:
    @JohnInCarolina are you in North GA?  I think I saw "Angel Falls" a couple years ago up there.  I'm sure there's only about 1,00 falls of that name in the country.
    Yes.  We're staying at a friend's mountain house in Clayton.  Should be close to the centerline of the eclipse tomorrow.
    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • tml1230tml1230 Posts: 237
    Johnin Carolina.... have been reading this post with great interest given your location and keen sense of all things astrometry related and theories concerning relative hardness.
    Being only 48. 7 miles NE of you ..  I hope for both of us that the old adage about "the sun don't shine one the same dog's butt twice" is incorrect. IF that theory IS in fact correct... we are both out of luck for the eclipse ....today during my overweight English bulldog's morning constitutional ( by the way he is  a grandson of UGA  number 4)  the sun glistened on his posterior.
    Sarasota Fl. and  Lake Toxaway N.C. (and Novembers on the island of Kauai) (and April in France.... Don't hate on me for that)
    BGE  medium and minimax
    HOW  BOUT THEM GATORS !
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    tml1230 said:
    Johnin Carolina.... have been reading this post with great interest given your location and keen sense of all things astrometry related and theories concerning relative hardness.
    Being only 48. 7 miles NE of you ..  I hope for both of us that the old adage about "the sun don't shine one the same dog's butt twice" is incorrect. IF that theory IS in fact correct... we are both out of luck for the eclipse ....today during my overweight English bulldog's morning constitutional ( by the way he is  a grandson of UGA  number 4)  the sun glistened on his posterior.
    LOL!
    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • thetrimthetrim Posts: 10,577
    tml1230 said:
    Johnin Carolina.... have been reading this post with great interest given your location and keen sense of all things astrometry related and theories concerning relative hardness.
    Being only 48. 7 miles NE of you ..  I hope for both of us that the old adage about "the sun don't shine one the same dog's butt twice" is incorrect. IF that theory IS in fact correct... we are both out of luck for the eclipse ....today during my overweight English bulldog's morning constitutional ( by the way he is  a grandson of UGA  number 4)  the sun glistened on his posterior.
    Get a room 
    =======================================
    XL 6/06, Mini 6/12, L 10/12, Mini #2 12/14 MiniMax 3/16
    Tampa Bay, FL
    EIB 6 Oct 95
  • JohnInCarolinaJohnInCarolina Posts: 17,162
    We had a nice show.  At first it looked like it would be blocked by the clouds, but they cleared out and it was pretty dark.  
    "A generation of the unteachable is hanging upon us like a necklace of corpses." - George Orwell 

    "I've made a note never to piss you two off." - Stike

    Living large in the 919
  • GATravellerGATraveller Posts: 7,820
    I got a chance to see it really well @ 97 percent. 

    "Social media gives legions of idiots the right to speak when they once only spoke at a bar after a glass of wine, without harming the community [...] but now they have the same right to speak as a Nobel Prize winner. It's the invasion of the idiots."

                                                                                  -Umberto Eco

    2 Large
    Peachtree Corners, GA
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