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  1. #326
    Thailand Expat lom's Avatar
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    Quote Originally Posted by Edmond View Post
    The size of the thing!
    That's what my missus said the first night we spend together!

  2. #327
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    Quote Originally Posted by Edmond View Post
    The size of the thing!

    It is just the second stage, they are always small. It looks big because it has the payload compartment on top. Volume slightly bigger than the volume of the ISS.

    Of course the first stage is bigger.

  3. #328
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    Video coverage of the SN15 flight was spotty. There was a very low cloud layer, only a few hundred meter high. This video is compiled from many different cameras and angles. Partly footage provided by SpaceX on board cameras, that had some problems transmitting live. Some directions had better views. The landing software has become better. SN15 not only landed intact, it was the first time it came down vertical, the legs crushed equally. The problem is, Starship does not have a center engine which would make it easy to come down vertical. But they want the ability to survive failure of any single engine. A center engine would make that even harder. So they use a triangle of engines. Any two, maybe even one of those can make a successful landing. One engine only with a small payload on Earth.

    They said, the fire after landing was not a problem, just residual methane from the landing engines after shutdown.

    "don't attribute to malice what can be adequately explained by incompetence"

  4. #329
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    Thank you. A very impressive display of excellence.

    Mr. Musk and all on the project can rightfully get pats on their backs.


  5. #330
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    SpaceX are now planning on orbital launch very soon. They got a license for comms beginning June 20. These FCC licenses are easy to get though. FAA license for launch is harder and they still have to build a lot of ground support equipment. July or August seem to be very doable, landing and reuse are not part of the first launch. They need to convince FAA first that it is safe to let them fly to landing pads.

    Meanwhile Jeff Bezos keeps pouring billions out of his own pocket into building a much smaller, much less capable system and is not advancing at all. There is proprietary info they have major setbacks.

  6. #331
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    A photo of one very important component of the SuperHeavy booster for Starship. It is the methane feed lines for the 28 Raptor engines driving the biggest booster ever.

    Photo by BocaChicaGal. She used to be just a resident of the tiny Boca Chica village in the middle of nowhere. Then SpaceX moved there and she was asked to snap a few photos. Now she is an accredited journalist and world famous among space fans for her dedication. She provides photos and video coverage almost daily. When media professionals come for live reporting she does the camera work and the professionals don't interfere in what she does. They know she knows best and provides the best possible coverage.

    SpaceX - On to Mars-methane-feed-jpg

  7. #332
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    From the picture above and other pictures we saw of the lower tank dome a fan made this graphic. It gives an idea how the 28 engines of the Starship Superheavy will be placed and fed with propellant. Looks like it is spot on. Very exciting for us fans.

    Can even be seen as simple and straightforward. As far as any design with 28 engines can ever be simple.

    SpaceX - On to Mars-sh-web-jpg


    About cost of these engines. The 28 engines will cost less than half of one of the 4 engines for NASA SLS. We can expect that the full stack of first and second stage of this Starship prototype with a total of 34 engines will cost less than one engine of SLS.

  8. #333
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    This is the third picture of this set. The Superheavy lower tank domes with the openings for propellant feed to the engines. The three pictures together give a quite clear impression how this works. If you spend a lot of time understanding and getting explanations.

    SpaceX - On to Mars-eyzqs8awgacx2b1-jpg

  9. #334
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    Quote Originally Posted by Takeovers View Post
    Can even be seen as simple and straightforward
    hmm. The green pipes have been connected. There's another set of blue pipes somebody forgot. What are those for?

    That's a lot of engines to ignite! How do they ignite them?

  10. #335
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    The blue pipes just connect to the dome in the third picture. To every second hole in that dome. They feed LOX, liquid oxygen, to the engines directly from the tank. The other half of the holes have the pipes connecting them to that central pipe from the fiirst picture bringing methane.

    The engines are ignited by electric sparks. 3 separate points of ignition. One ignites a little methane on the LOX turbine pumping the LOX. One ignites methane with a little LOX on the Methane turbine. The third ignites the mix of LOX and Methane in the main combustion chamber. If the sequence of ignitions is only a little off you have a bad day. Full flow staged combustion engines are extremely tricky. There are good reasons why nobody has used them yet. Though the Soviets had a few on test stand but never made it to actual rockets. They have some advantages if they can be made to work. Like lower temperatures which makes them very robust even at the extreme power they produce.

    They say, starting a rocket engine requires magic. Starting a full flow staged combustion engine requires black magic. Good thing that SpaceX had Tom Mueller, a renowned rocket engine wizard. Though he was only in an advisory function for Raptor. He did develop the Merlin engine that made SpaceX what they are today.

    Though even back then Elon Musk made some cruicial decisions what exactly to develop. The story is that Tom Mueller made some suggestions what to do. Elon Musk did not like any of the options. So as a last resort he suggested one more option. Saying there are reasons why nobody ever tried this. If we do it we will blow up many engines on the test stand. But if we get it to work it will be a very robust and cost efficient engine. Elon said, this is what we will do. The result was the Merlin engine. But Raptor is again a class up, the best engine ever. Before when talking about engines he always praised the russian RD-180 engine as a top development, way ahead of Merlin.

  11. #336
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    ^
    Thanks for the info.

    Has SpaceX fired up, a complete 28 engine assembly, yet?


    Tom Mueller

    SpaceX - On to Mars-tom-mueller-profile-jpg

    Elton hit the mother lode taking him aboard.

    Tom Mueller - Wikipedia
    "Son of a lumberjack.

    Research interests:

    Spatial Inequality, Natural Resources, Rural Economic Development, Poverty, Public Health"

    A true hero.


    A tray full of GOLD is not worth a moment in time.

  12. #337
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    Quote Originally Posted by OhOh View Post
    Has SpaceX fired up, a complete 28 engine assembly, yet?
    No, they don't have a stand to do that, they are building it right now. The 2 photos are the real thing, those components will make the first orbital booster and are expected to go to orbit, once the orbital launch pad is finished and they get FAA permission. It will be tested on the orbital launch mount.

    The integration tower, for stacking Starship on the launch mount. And for catching the booster on return. The booster is planned not to have legs and the tower will catch it in the air. Saves weight on the booster and the tower can place it right back on the launch mount for the next flight. It will be ~150m high. One of the more crazy ideas but they are serious about it.

    SpaceX - On to Mars-05-starbase-tower-jpg

    SpaceX - On to Mars-launch-mount-jpg

    The launch mount, also nowhere near completion.

    Building massive structures there is a challenge. The underground is 300m of mud, from the Rio Grande river delta. On nearby South Padre Island they recently had to blow up a brandnew highrise building because the foundations failed. This is a lot more massive than any ordinary highrise.




    Quote Originally Posted by OhOh View Post
    Elon hit the mother lode taking him aboard.
    Absolutely. Without him SpaceX would not have survived the first few years. But the same is true for Tom Mueller as well. He said when he took the job he thought he could easily go back to the kind of job he held before. But after a few months at SpaceX he knew he could never go back to the boring old job.
    Attached Thumbnails Attached Thumbnails SpaceX - On to Mars-sh-web-jpg  
    Last edited by Takeovers; 26-05-2021 at 11:58 AM.

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