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Readers!

 

It is now July, time once again to celebrate the start of this webpage in 2010 with my annual July fund-raising campaign.

 

This year I celebrate the fifteenth anniversary since I began Behind the Black. During that time I have done more than 33,000 posts, mostly covering the global space industry and the related planetary and astronomical science that comes from it. Along the way I have also felt compelled as a free American citizen to regularly post my thoughts on the politics and culture of the time, partly because I think it is important for free Americans to do so, and partly because those politics and that culture have a direct impact on the future of our civilization and its on-going efforts to explore and eventually colonize the solar system.

 

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Watch SpaceX retract one leg from used Block 5 booster

For geeks only! The video below the fold shows the new equipment that SpaceX has developed to retract the open legs of a used Block 5 booster. This video shows them attaching the booster in a secure vertical position, then attaching cables to the base of the first leg which are then used to retract it back into its launch position against the side of the booster. The design is quite clever.

The design also shows how primitive the art of reusable rockets remains. Though SpaceX has clearly succeeded in simplifying and automating this process, it remains slow and complex. In time this will get easier, but right now, this remains state of the art.

Hat tip Jim Mallamace.

Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

6 comments

  • Jeff

    Apparently this was only a test, as the leg was lowered and all four legs removed yesterday.

    https://forum.nasaspaceflight.com/index.php?topic=45842.msg1842074#msg1842074

  • Kirk

    Interesting. Makes you wonder if it was planned as just a test all along, or if something didn’t quite work right.

    I had wondered if any manual intervention would be necessary to ensure that the pusher (the small pneumatic strut hinged just below the large leg strut) would require any manual intervention to ensure that it made proper contact with the folding leg. I see that at 8:55 in the video a worker in a cherry picker leans in and adjusts the pusher angle slightly.

    What I couldn’t tell from the retraction video was whether they needed to do anything special to pusher (the smaller rod

  • Kirk

    Oops. Trailing partial sentence above is an editing error.

    In other SpaceX news from the NSF forum, one member is reporting that last week’s ASAP meeting revealed that “some undesirable anomalies were observed” during the first two Block 5 engine tear downs, and that SpaceX is making “a couple short term fixes” prior to the DM1 uncrewed flight test. I believe that many core watchers had expected the DM1 core, # B1051, to have left Hawthorne for McGregor by now. Perhaps those engine modifications have delayed it a bit.

  • Tom Billings

    “Though SpaceX has clearly succeeded in simplifying and automating this process, it remains slow and complex. In time this will get easier, but right now, this remains state of the art.”

    Indeed, this will be entirely disrupted, when the BFR Booster simply lands back in its cradle.

  • Kirk

    Back to the leg pusher, this Teslarati photo of the West Coast booster B1048 (from last Wednesday’s Iridium Next 7 launch) shows the stainless steel cup which the pusher bears against.

  • Edward

    Kirk,
    I’m going to go with the “planned as just a test” option. They did not seem set up to secure the leg to the body.

    When they install the legs, it is almost certainly not in the open position but in the closed position, so this is probably new territory for them.

    My guess is that they were there to prove the concept, to test the hoisting equipment, and to verify the methods and procedures. They may also be investigating what it takes to get that pusher to seat properly in the stainless cup during retraction.

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