Author Topic: SpaceX Falcon 9 FT - ORBCOMM-2 - Dec. 21, 2015 (Return To Flight) DISCUSSION  (Read 1360699 times)

Offline Jim

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...Shows that its docked at Coast Guard Station Port Canaveral (CG sign, 2 CG RHIBs).  Any theories on why that spot may have been chosen? 

Because it is available?   It isn't at the station, it is next to it.


So what if I speculated that Go Quest's presence there was to brief the CG people that will be running the security zone on how this rocket differs from the rockets they are used to (its a boomarang) and coordinating how they'll work together on game day?  Mariner to mariner talk.

No, the Coast Guard just clears out the zone.  The Coast Guard supports the range and the range is the one that provides the direction.  Not the customer.
« Last Edit: 12/17/2015 02:06 pm by Jim »

Offline Johnnyhinbos

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Full res image:

I'm fairly sure that's the current booster, an ACS pod is at the new location.

Agree. Plus the grid fins don't appear to have the aero fairings, which has been stated by a SpaceX tech as not being on this bird.
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Offline Dante80

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Any idea about apparent differences in size or details except for the fins when compared to v1.1?
« Last Edit: 12/17/2015 03:16 pm by Dante80 »

Offline edkyle99

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F9-21 is slightly taller from the base of the interstage up.  The overall stretch is noticeable, but barely because I think it is less than two feet somewhere around maybe 3-4 feet give or take - compared to the 12 foot stage diameter.

 - Ed Kyle
« Last Edit: 12/17/2015 04:33 pm by edkyle99 »

Offline abaddon

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Anyone know if they had to make any accommodations for the stretch on the TEL?  I guess alternatively they built in a little margin when it was originally assembled, or it's too small of a stretch to matter.

Offline edkyle99

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Anyone know if they had to make any accommodations for the stretch on the TEL?  I guess alternatively they built in a little margin when it was originally assembled, or it's too small of a stretch to matter.
They modified the TEL near the top.  One of the truss sections was lengthened a bit.

 - Ed Kyle
« Last Edit: 12/17/2015 03:36 pm by edkyle99 »

Offline Dante80

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That's a very cool observation. It seems like in the original TEL, the truss section in question was (deliberately?) shorter than the other ones. It now seems to be the same size.
« Last Edit: 12/17/2015 04:14 pm by Dante80 »

Online tleski

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That's a very cool observation. It seems like in the original TEL, the truss section in question was (deliberately?) shorter than the other ones. It now seems to be the same size.

As far as I can see this shorter section has a different structure and possibly is a stretchable part of the tower that allows for flexibility and adjustment to the length of the rocket. Am I completely wrong?

Offline sojourner

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Has there been any confirmation on RTLS?

Offline Lars-J

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F9-21 is slightly taller from the base of the interstage up.  The overall stretch is noticeable, but barely because I think it is less than two feet somewhere around maybe 3-4 feet give or take - compared to the 12 foot stage diameter.

 - Ed Kyle

Isn't this F9-20, not 21? I guess it depends if you mean manufacturing order or launch order.

Offline ethan829

Has there been any confirmation on RTLS?


Still no word on FAA approval, but keep in mind that the final decision will likely be made much closer to the launch.

Offline edkyle99

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Isn't this F9-20, not 21? I guess it depends if you mean manufacturing order or launch order.
It is 21 in production sequence as best I can determine, and the first Full Thrust version.  No. 20 launched (tried to launch) CRS-7.  No. 19 will launch Jason.

 - Ed Kyle

Offline ethan829


https://twitter.com/Restrantek/status/677654404556828675
Quote
"Loading propellant and one more try in 10 minutes" Source asked not to be identified




https://twitter.com/elonmusk/status/677660460230041600
Quote
Falcon 9 is vertical on the launch pad at Cape Canaveral. Working towards static fire. Deep cryo liquid oxygen presenting some challenges.
« Last Edit: 12/18/2015 12:25 am by ethan829 »

Offline enzo

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Ok, so the issue is cryo/tanking related. Could someone explain why this issue wasn't apparent during testing in TX. Wouldn't it be logical to use a similar setup at the test stand as at LC-40, to avoid surprises at the Cape?
« Last Edit: 12/18/2015 12:41 am by enzo »

Offline ngilmore

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https://twitter.com/elonmusk/status/677663227271118848

Quote
Elon Musk ‏@elonmusk  1m1 minute ago
@PaigeANjax -340 F in this case. Deep cryo increases density and amplifies rocket performance. First time anyone has gone this low for O2.

Offline cscott

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On an operational rocket, he means.  NASA built a test plant and even a mock stage IIRC, so the basic idea was vetted.  Always a surprising distance between theory and practice, of course.

EDIT: and the Russians apparently used supercooled LOX on an upper stage... just not *as* cooled, apparently.
« Last Edit: 12/18/2015 12:52 am by cscott »

Offline Jim

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Ok, so the issue is cryo/tanking related. Could someone explain why this issue wasn't apparent during testing in TX. Wouldn't it be logical to use a similar setup at the test stand as at LC-40, to avoid surprises at the Cape?

No, Because there are unavoidable differences between the sites

Offline cscott

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Yeah, I'm sure things are as similar as possible.  That doesn't mean *identical*, and that's of course where the bugs creep in.

Offline rcoppola

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Could this be a pumping issue? Or a pressurization issue? Perhaps a TEL connection issue with the -340 LOX?
« Last Edit: 12/18/2015 12:59 am by rcoppola »
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Offline Sesquipedalian

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