Author Topic: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION  (Read 186678 times)

Offline ATPTourFan

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #300 on: 12/15/2017 09:04 pm »
On the technical webcast (thanks for sharing that!), has anyone seen an early test of water suppression system before at T-4:35?

One of the enhancements SpaceX spoke about with the new SLC-40 was improvements to this system. I just don't remember, on either Historic LC-39A or SLC-40, seeing this water test at this point in the count.


Offline cppetrie

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #301 on: 12/15/2017 09:25 pm »

So what is this thing? Washers typically don't come loose unless the nut holding them on comes loose, was that just missed? r is it something else like a spacer?


Just before the floating washer there was this picture of the bottom of the Dragon.
 What is this? Does it come off at Dragon sep? Those washers look familiar.
Those look like riveted snaps as you might find on a coat or pants. Mounting point for a button-on cover of some sort?

Offline billh

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #302 on: 12/15/2017 10:59 pm »
We had a long shot this time of the Dragon after spacecraft separation and I was really hoping to see the solar array covers jettisoned. Alas, no! Has it ever been shown on any video? I can't recall ever seeing it.

Offline deruch

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #303 on: 12/15/2017 11:26 pm »
We had a long shot this time of the Dragon after spacecraft separation and I was really hoping to see the solar array covers jettisoned. Alas, no! Has it ever been shown on any video? I can't recall ever seeing it.

Yes, we've seen it at least once.  Though I don't remember which mission.
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Offline wannamoonbase

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #304 on: 12/15/2017 11:38 pm »
Congrats SpaceX and NASA.  Another great launch and landing.

I don’t think I’ll ever get bored of watching a core land.

Really nice to see LC40 active again, bring on the next one!
Wildly optimistic prediction, Superheavy recovery on IFT-4 or IFT-5

Offline hpras

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #305 on: 12/15/2017 11:56 pm »
Looks like the Eye of Sauron when it goes to 3 engine retroburn

Love that NASA burnback and landing footage.

Offline su27k

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #306 on: 12/16/2017 02:21 am »
We had a long shot this time of the Dragon after spacecraft separation and I was really hoping to see the solar array covers jettisoned. Alas, no! Has it ever been shown on any video? I can't recall ever seeing it.

Yes, we've seen it at least once.  Though I don't remember which mission.

CRS-6, which happened to be the previous use of this Dragon: https://www.youtube.com/watch?v=csVpa25iqH0?t=1701

I was also hoping they can get another view of the covers jettison, but they kept switching back to MVac.
« Last Edit: 12/16/2017 02:22 am by su27k »

Offline billh

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #307 on: 12/16/2017 03:21 am »
We had a long shot this time of the Dragon after spacecraft separation and I was really hoping to see the solar array covers jettisoned. Alas, no! Has it ever been shown on any video? I can't recall ever seeing it.

Yes, we've seen it at least once.  Though I don't remember which mission.

CRS-6, which happened to be the previous use of this Dragon: https://www.youtube.com/watch?v=csVpa25iqH0?t=1701

I was also hoping they can get another view of the covers jettison, but they kept switching back to MVac.

Awesome. Thanks!

Online FutureSpaceTourist

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #308 on: 12/16/2017 06:56 pm »
Having looked at more pictures (SpaceX one attached) it’s now clear that one side of the booster was clean at lift-off while the other side was still sooty. The clean side was closer to the strong back and thus the one with lots of LOX vapours swirling around it. So maybe that’s the cleaning agent?!

Online ugordan

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #309 on: 12/16/2017 07:17 pm »
Having looked at more pictures (SpaceX one attached) it’s now clear that one side of the booster was clean at lift-off while the other side was still sooty. The clean side was closer to the strong back and thus the one with lots of LOX vapours swirling around it. So maybe that’s the cleaning agent?!

It wasn't cleaned, it was just iced-over. Watch the webcast, the wind was blowing from the strongback direction so that's where most of the water vapor condensed on the tankage.

Offline mdeep

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #310 on: 12/16/2017 07:48 pm »
A journey in photos...


Offline llanitedave

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #311 on: 12/16/2017 08:09 pm »
2 things I noticed:  First, the first stage flip after staging was extremely fast, making for an efficiently timed boostback burn.  Second, no flaming fuel drip after landing!  The postlanding was very clean.
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Online ugordan

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #312 on: 12/16/2017 09:25 pm »


« Last Edit: 12/16/2017 09:31 pm by ugordan »

Online ugordan

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #313 on: 12/16/2017 09:35 pm »

Offline John Cardinal

Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #314 on: 12/16/2017 11:20 pm »
I just (maybe 30 minutes ago) watched the ISS do a pass overhead. Even though it’s a bit cloudy here, it was still visible and was darned near directly overhead at one point. Trailing some distance behind it I saw another, much dimmer dot of light. Did I see CRS 13? 

Online zubenelgenubi

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #315 on: 12/17/2017 01:12 am »
I just (maybe 30 minutes ago) watched the ISS do a pass overhead. Even though it’s a bit cloudy here, it was still visible and was darned near directly overhead at one point. Trailing some distance behind it I saw another, much dimmer dot of light. Did I see CRS 13?

There are currently a total of 3 satellites sharing approximately the same orbit, but slightly offset in perigee/apogee:
ISS
Cygnus OA-8
Dragon SpX-13

Dragon rendezvous and berths with ISS tomorrow.  Also, I checked the orbits and pass details (for my location) for both satellites on heavens-above.com : It matches your brief description above!
« Last Edit: 12/17/2017 01:14 am by zubenelgenubi »
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Offline bjornl

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #316 on: 12/17/2017 08:32 am »
2 things I noticed:  First, the first stage flip after staging was extremely fast, making for an efficiently timed boostback burn.
Noticed that one too, and went back to find comparison. Side-by-side with NROL-76: http://youtubedoubler.com/mqCH

[edit for shorter URL]
« Last Edit: 12/17/2017 08:34 am by bjornl »

Offline wannamoonbase

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #317 on: 12/17/2017 02:45 pm »
2 things I noticed:  First, the first stage flip after staging was extremely fast, making for an efficiently timed boostback burn.
Noticed that one too, and went back to find comparison. Side-by-side with NROL-76: http://youtubedoubler.com/mqCH

[edit for shorter URL]

Super quick turn and burn.  Seems SpaceX is getting the timing refined. 

It will be interesting to see how fast the FH side boosters can do the boost back burn since they peel off the side versus axial separation.
Wildly optimistic prediction, Superheavy recovery on IFT-4 or IFT-5

Offline Comga

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #318 on: 12/17/2017 03:30 pm »
2 things I noticed:  First, the first stage flip after staging was extremely fast, making for an efficiently timed boostback burn.

Noticed that one too, and went back to find comparison. Side-by-side with NROL-76: http://youtubedoubler.com/mqCH

[edit for shorter URL]

Super quick turn and burn.  Seems SpaceX is getting the timing refined. 

It will be interesting to see how fast the FH side boosters can do the boost back burn since they peel off the side versus axial separation.

That's a neat way to compare videos, but I can't resolve any real difference in the interval between MECO and the start of the boostback burn.  Did anyone do a more careful comparison, perhaps going frame by frame?
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline KSHavre

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Re: SpaceX Falcon 9 : CRS-13 : Dec 15, 2017 : DISCUSSION
« Reply #319 on: 12/17/2017 04:20 pm »
2 things I noticed:  First, the first stage flip after staging was extremely fast, making for an efficiently timed boostback burn.

Noticed that one too, and went back to find comparison. Side-by-side with NROL-76: http://youtubedoubler.com/mqCH

[edit for shorter URL]

Super quick turn and burn.  Seems SpaceX is getting the timing refined. 

It will be interesting to see how fast the FH side boosters can do the boost back burn since they peel off the side versus axial separation.

That's a neat way to compare videos, but I can't resolve any real difference in the interval between MECO and the start of the boostback burn.  Did anyone do a more careful comparison, perhaps going frame by frame?

I agree. It may have been the different angle of the shot, but it seems that NROL-76 did not have to rotate as far (loftier trajectory?), so rotated slower. The boost-back engine start of each looked to be at the same time.
« Last Edit: 12/17/2017 04:21 pm by KSHavre »

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