Author Topic: SpaceX Falcon 9 (F9-B1036) West Coast JRTI return - Coverage  (Read 48107 times)

Offline Req

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Offline FutureSpaceTourist

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Welcome home!! #spacex #falcon9 @CBSLA @KNX1070 #sanpedro

https://twitter.com/shorealonefilms/status/880127249961201665

Edit to add: other picture two posts up is at
https://twitter.com/shorealonefilms/status/880129988468527104
« Last Edit: 06/28/2017 07:08 pm by FutureSpaceTourist »

Offline Chris Bergin

Good work everyone. Remember to post specific links. No one wants to read the endless list of nonsense searching "SpaceX" on Twitter, links that will have no relevance "tomorrow" as they will be linking to events not related to this one.
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Offline FutureSpaceTourist

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Coming across the flats. #Falcon9 headed to dock.

https://twitter.com/htitussweany/status/880136589162143744

Offline Scylla

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I reject your reality and substitute my own--Doctor Who

Offline FutureSpaceTourist

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Here's higher resolution

Are they using the roomba? The engine section is conveniently covered up or too low resolution in all of the images! Or is it just on OCISLY?
« Last Edit: 06/28/2017 10:38 pm by Kamik423 »

Offline southshore26

There is only 1 on OCISLY.

Offline FutureSpaceTourist

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http://photos.dailybreeze.com/2017/06/photos-spacex-falcon-9-booster-towed-into-port-of-los-angeles-after-iridium-2-launch/#1

In this particular picture, you can really see how close the bells are to the ground. Usually, you can almost walk right under them!
« Last Edit: 06/28/2017 11:27 pm by tvg98 »

Offline Lars-J

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http://photos.dailybreeze.com/2017/06/photos-spacex-falcon-9-booster-towed-into-port-of-los-angeles-after-iridium-2-launch/#1

In this particular picture, you can really see how close the bells are to the ground. Usually, you can almost walk right under them!

It is possible that this is a tweaked leg design that allows more piston compression. Both of the last two landings settled this low, so it is a possible explanation.

Offline SweetWater

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http://photos.dailybreeze.com/2017/06/photos-spacex-falcon-9-booster-towed-into-port-of-los-angeles-after-iridium-2-launch/#1

In this particular picture, you can really see how close the bells are to the ground. Usually, you can almost walk right under them!

It is possible that this is a tweaked leg design that allows more piston compression. Both of the last two landings settled this low, so it is a possible explanation.

It would make a lot of sense for SpaceX to design the legs to have the back end of the first stage closer to the deck of the drone ship if possible. Most of the mass of the rocket is - presumably - in the engines and octoweb. Having the center of gravity even slightly closer to the deck would make the stage more stable, particularly in rough seas.

Offline ulm_atms

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It would make a lot of sense for SpaceX to design the legs to have the back end of the first stage closer to the deck of the drone ship if possible. Most of the mass of the rocket is - presumably - in the engines and octoweb. Having the center of gravity even slightly closer to the deck would make the stage more stable, particularly in rough seas.

True...but Thaicom-8 was REALLY bad on leaning and it didn't seem to have any issues with stability that I know of.

I see two issues with "lowering" the final landing position so to speak.

1.  Less room to work under (roomba on OCISLY for example) making securing harder with those tighter clearances.
2.  Less margin for up and down movements due to landing issues (ASDSs do move up and down)

My personal opinion watching both landings is that OCISLY's was at the limit of the rocket (3 engine burn, higher G's, WAY less time to get Velocity=0/Height=0 correct) so it hit harder with a more horizontal movement then usual. (FYI...would LOVE to see what is left of the grid fins...I suspect one or more are not 100% complete anymore and that cause the excess horizontal movement at the end to adjust for that).  JRTI's landing was hard too due to wave motion and the rocket shut off before the feet were touching the deck(that's what I get from viewing the video anyways).

Basically...these two hit harder then usual/wanted and because of that they used up crush core and are sitting lower then normal.

Offline FutureSpaceTourist

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Close-up of returning grid fins from Matt Hartman's flickr:
https://www.flickr.com/photos/81789298@N05/sets

Offline Scylla

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Offline ulm_atms

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Close-up of returning grid fins from Matt Hartman's flickr:
https://www.flickr.com/photos/81789298@N05/sets

Are you sure those are the same??  They look like they did before launch...  8)

Offline cppetrie

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Close-up of returning grid fins from Matt Hartman's flickr:
https://www.flickr.com/photos/81789298@N05/sets
They look none worse for the wear. Ready to be bolted on to the next core.

Offline Coastal Ron

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Close-up of returning grid fins from Matt Hartman's flickr:
https://www.flickr.com/photos/81789298@N05/sets

Are you sure those are the same??  They look like they did before launch...  8)

As they should, right? And I thought I heard that over time they would take on kind of a golden patina from oxidation...
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Offline Semmel

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And I thought I heard that over time they would take on kind of a golden patina from oxidation...

Wasn't it titanium nitrate that us golden? Anyhow, not sure about the patina. If the soot from the reentry and landing burns is not cleaned, probably not. If the soot is cleaned away, it could easily scape off a thin titanium oxide or nitrate layer. Like you, I am hopeful they turn golden over time, would look neat :-)

Offline cambrianera

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And I thought I heard that over time they would take on kind of a golden patina from oxidation...

Wasn't it titanium nitrate that us golden? Anyhow, not sure about the patina. If the soot from the reentry and landing burns is not cleaned, probably not. If the soot is cleaned away, it could easily scape off a thin titanium oxide or nitrate layer. Like you, I am hopeful they turn golden over time, would look neat :-)

Titanium Nitride (TiN) has golden appearance.
Lot of types for tool coating, one of most likely is TiAlN (color seems the same as actual grid fins, and very good resistance to heating).
Oh to be young again. . .

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