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Thread: SpaceX

  1. #2431
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    Quote Originally Posted by cjameshuff View Post
    Can you say "control authority"?
    Starship: "I'm turning around. Now."
    Yeah. And hold on to your lunch.

  2. #2432
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    Operational Starlink network satellites this time, not test birds.

    Date: NET October 17
    Time: TBA
    Pad: LC-40
    Core: TBA
    Recovery: ASDS Of Course I Still Love You

    Number of satellites: TBA
    Initial orbit: 350km circular
    Target altitude(s): TBA
    Target inclination(s): TBA
    Frequency bands: Ka, Ku

    SpaceX seems to be planning on 22 satellites/plane and 3 planes/launch, so they may try shoehorning 66 satellites per launch. We'll see.

    Up to 24 Starlink launches in 2020

  3. #2433
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    The Raptors are already installed?

    Elon Musk ✓ @elonmusk
    Just leaving SpaceX Starship build site in Boca

    https://twitter.com/elonmusk/status/1176007759751499776

    [video at tweet]
    |
    Bottom half of Starship at night. Top half with forward fins & header tanks probably stacks on Wednesday. Three Raptors already installed. https://t.co/haq3m1V1Wm

    IMG_20190923_030304.jpg

    https://twitter.com/elonmusk/status/1176009047729954818
    Last edited by docmordrid; 2019-Sep-23 at 07:36 AM.

  4. #2434
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    For test hardware, this is getting quite substantial. Then again, how would you make a huge orbital test item without making it substantial...
    With sufficient thrust, water towers fly just fine.

  5. #2435
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    Those fins might more appropriately be referred to as wings.
    Cum catapultae proscriptae erunt tum soli proscript catapultas habebunt.

  6. #2436
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    Quote Originally Posted by Trebuchet View Post
    Those fins might more appropriately be referred to as wings.
    Only if the return glide path included some form of aerobraking as it re-enters. This would be a change of landing procedures, but that rather defines SpaceX.

  7. #2437
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    The fins act more like drag brakes, adjusting entry and free-fall attitude like a skydiver uses his limbs.

    The Crew Dragon In-Flight Abort test FCC STA (Special Temporary Authority) is in. This allocates radio frequencies for the flight.

    Pad LC-39A

    Simulated second stage.

    Start date: November 23, 2019
    End date: May 23, 2020

    https://apps.fcc.gov/oetcf/els/repor...stTimeout=1000

    Please explain in the area below why an STA is necessary:

    This application uses information from previous grant, 1829-EX-ST-2019. This STA is necessary to authorize launch vehicle communications for SpaceX Mission 1357, a launch from Complex 39a, Kennedy Space Center. The application includes a sub-orbital first stage, and a simulated orbital second stage. Trajectory data shall be provided directly to NTIA, USAF, and NASA. All downrange Earth stations are receive-only. Launch licensing authority is FAA Office of Commercial Space Transportation.

  8. #2438
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    Quote Originally Posted by docmordrid View Post
    The fins act more like drag brakes, adjusting entry and free-fall attitude like a skydiver uses his limbs.

    The Crew Dragon In-Flight Abort test FCC STA (Special Temporary Authority) is in. This allocates radio frequencies for the flight.

    Pad LC-39A

    Simulated second stage.

    Start date: November 23, 2019
    End date: May 23, 2020

    https://apps.fcc.gov/oetcf/els/repor...stTimeout=1000
    So a form of aerobraking is correct.

  9. #2439
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    Yup. 1959 vertical wind tunnel tests at Langley demonstrated something like it, but using a triangular vehicle. Look for this one at about 01:20,

    Drag brake descent test 1950s.jpg

    https://youtu.be/mX2lRNjQyYY
    Last edited by docmordrid; 2019-Sep-24 at 06:15 PM.

  10. #2440
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    A refined explanation...

    Perhaps those 100kW Tesla Model S batteries installed in the nose cone yesterday will be joined by a version of their new switched reluctance motors...

    https://twitter.com/elonmusk/status/1176557352964591620

    Elon Musk ✓ @elonmusk
    Thats correct. Essentially controlled falling, like a skydiver.

    https://twitter.com/elonmusk/status/1176557685820387328

    Elon Musk ✓ @elonmusk
    Many powerful electric motors & batteries. Force required is enormous, as entire fin moves. More about this on the 28th.

    https://twitter.com/elonmusk/status/1176557946018230272

    Elon Musk ✓ @elonmusk
    It does actually generate lift in hypersonic regime, which is important to limit peak heating

    http://twitter.com/djsnm/status/1176558633737285632

    Scott Manley @djsnm
    And just like that I need to rebuild some of my descent models. So the AoA won't be 90 degrees, it'll provide lift to keep vehicle out of denser atmosphere until it loses enough speed.

    https://twitter.com/elonmusk/status/1176559598368460800

    Elon Musk ✓ @elonmusk
    Exactly. For reusable heatshield, minimize peak heating. For ablative/expendable, minimize total heat. Therefore reusable like Starship wants lift during high Mach reentry for lower peak, but higher total heat.

  11. #2441
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    The cargo module halves have been re-stacked, and a monster crane has lifted the propulsion module into Roll-Lift crawler-transporters. It's now being moved, and well past the cargo module. This may be final assembly, either here or at the pad. We'll see...

    https://youtu.be/-aDOpyUmfL4

    MK1_9-25 move.jpg
    Last edited by docmordrid; 2019-Sep-25 at 08:27 PM.

  12. #2442
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    SPadre @SpacePadreIsle
    Big yellow crane just arrived in position to lift the nose cone...

    EFVuLykXkAALW6L.jpeg

    https://twitter.com/SpacePadreIsle/s...68087331115008

  13. #2443
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    Note that this transporter did not cost $100m (SLS snark)

    Elon Musk ✓ @elonmusk
    On the transporter

    IMG_20190926_033326.jpg

    https://twitter.com/elonmusk/status/1177050841041125376

  14. #2444
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    Transporter, Schmansporter! I was more interested in the big gap between the body and the fins. I hadn't seen that before.
    Cum catapultae proscriptae erunt tum soli proscript catapultas habebunt.

  15. #2445
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    Quote Originally Posted by Trebuchet View Post
    Transporter, Schmansporter! I was more interested in the big gap between the body and the fins. I hadn't seen that before.
    Now you haven't been paying close enough attention. They(gaps) have been in several images.

  16. #2446
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    Quote Originally Posted by Trebuchet View Post
    Transporter, Schmansporter! I was more interested in the big gap between the body and the fins. I hadn't seen that before.
    To hold the fins in place while supporting hardware, chases, and fairings are attached.

    One big piece is the combo leg mount + hinge that'll go under each fin. 6 legs total, with two more windward and two leeward (relative to reentry flow).

  17. #2447
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    Anybody know (or able to point to a source) how much power it takes to run the oxygen and fuel pumps on a Raptor engine? Haven't been able to find info on that. I've found info on the power the pumps produce, but not how much it takes to run them. For example the gas generator on the F-1 (quite different from a full flow staged combustion design like the Raptor) which was used to run the pumps produced 55,000 horsepower (41 MW).

  18. #2448
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    Raptor pumps: 100,000 HP / 74,570 kilowatts, with a preburner pressure of about 800 bar. Fun fact: the developed a new single crystal superalloy for Raptor; SX500.
    Last edited by docmordrid; 2019-Sep-26 at 05:53 PM.

  19. #2449
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    Quote Originally Posted by docmordrid View Post
    Raptor pumps: 100,000 HP / 74,570 kilowatts, with a preburner pressure of about 800 bar. Fun fact: the developed a new single crystal superalloy for Raptor; SX500.
    Thanks. Missed a diagram from Wikipedia that shows the methane turbo-pump at 28 MW and the LOX turbo-pump at 34 MW. Seems to be in the same ball park as yours. Those numbers are maybe based on 300 bar as the wikipedia page also states but they are actually running a bit higher chamber pressure, correct?

  20. #2450
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    They're running about 250 bar at the moment, but iterating to 300. At 300 it'll have a higher thrust than the Space Shuttle Main Engine (RS-25), about the same as Blue Origin's BE-4 but much, much smaller & lighter.

    Starship will normally have 6 engines, 3 sea level and 3 vacuum, but it can use more if all are sea level engines (smaller nozzles). Only the center 3 can gimbal (steer), up to 15.

    Elon Musk √ @elonmusk
    Three Raptors on a Starship

    EFapNVWU8AAnr8d.jpeg

    EFapNVUU4AATf0N.jpeg

    EFapNVWUwAEe28O.jpeg

    https://twitter.com/elonmusk/status/1177314408604680192

  21. #2451
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    Does it have those stringers all through the spacecraft? I had this mental image of the inside being just like the outisde, ie just bent steel plates welded together. Which didn't seem very capable of supporting its weight to me. So the stringers do make a lot of sense. Makes it look a lot more "aerospace" as well.
    With sufficient thrust, water towers fly just fine.

  22. #2452
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    HEADS UP

    Dave Mosher ✔ @DaveMosher (Business Insider)

    SpaceX should livestream Elon Musk's #Starship presentation from #BocaChica around 8 p.m. ET (7 p.m. CT/local) on Saturday. Exact event location: Not yet clear. But it has to be either at the company's work yard (near control center) or launch pad (near Boca Chica Beach).
    7:57 PM - Sep 26, 2019

    https://twitter.com/DaveMosher/statu...71732270833665

  23. #2453
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    Quote Originally Posted by Nicolas View Post
    Does it have those stringers all through the spacecraft? I had this mental image of the inside being just like the outisde, ie just bent steel plates welded together. Which didn't seem very capable of supporting its weight to me. So the stringers do make a lot of sense. Makes it look a lot more "aerospace" as well.
    Looks much more structurally sound to me, but hey, what do I know, I'm a systems guy!
    Cum catapultae proscriptae erunt tum soli proscript catapultas habebunt.

  24. #2454
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    The Starship upper fin position debate is settled

    Mary @BocaChicaGal
    A canard is being attached to Starship Mk1 at Boca Chica this evening
    @NASASpaceflight

    EFcQJa5XYAA0Rvq.jpeg

    https://twitter.com/BocaChicaGal/sta...27606267932672

  25. #2455
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    Hello, baaaaby!!!

    Mary @BocaChicaGal
    Good morning everyone, both canards are on and today is joining day. Cant wait to see a fully stacked StarShip!😆🚀 https://t.co/dKAlFxhylR

    IMG_20190927_095950.jpg

    IMG_20190927_100107.jpg

    https://twitter.com/BocaChicaGal/sta...79918126977025

    https://twitter.com/BocaChicaGal/sta...61624296808448

  26. #2456
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    Integrating the payload module - she rises...

    Live stream

    https://youtu.be/-aDOpyUmfL4

    IMG_20190927_134355.jpg

  27. #2457
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    Not mated as of 1307 CDT.

  28. #2458
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    SPadre @SpacePadreIsle
    Look at Starship 😍🚀

    IMG_20190927_135630.jpg

    https://twitter.com/SpacePadreIsle/s...41152562044928

  29. #2459
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  30. #2460
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    Quote Originally Posted by docmordrid View Post
    Shiny!
    At night the stars put on a show for free (Carole King)

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