Author Topic: LIVE: SpaceX Falcon 9 v1.1 - CASSIOPE - Sept. 29 - LAUNCH UPDATES  (Read 235195 times)

Online Ben the Space Brit

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First I've ever heard of centrifuged propellant causing a shutdown. This has probably happened before somewhere though, does anyone know?

It would be a big issue for the F9 during descent as the tanks will be almost empty.  It wouldn't be such an issue during an early flight phase.
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Offline Ronsmytheiii

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Jeff Foust ‏@jeff_foust 44s

Musk: attempted relight of upper stage, encountered anomaly. Understand what it is and will fix before next flight. #falcon9

Re-light is a must for the SES flight. Wonder if this will delay it.

F9 flight 1 had a similar issue, but it was figures out by the next flight.
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Offline douglas100

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Based on Musk's tweets I'd say the recovery effort was pretty encouraging. How the stage would behave on entry was the big unknown. They now have solid data on that (and parts of the stage as well.)
Douglas Clark

Online Ben the Space Brit

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Jeff Foust ‏@jeff_foust 44s

Musk: attempted relight of upper stage, encountered anomaly. Understand what it is and will fix before next flight. #falcon9

The upper stage might therefore be the object in the lower-than-expected orbit.
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Offline AndyX

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Jeff Foust ‏@jeff_foust 44s

Musk: attempted relight of upper stage, encountered anomaly. Understand what it is and will fix before next flight. #falcon9

Ah yes, that was on the L2 thread a few hours ago. Glad it's a minor issue.

Offline tigerade

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Musk: new pad at Vandenberg AFB also performed well. #falcon9

Offline douglas100

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Is it? Can't they work out a trajectory with a longer burn of the second stage?

Insertion into GTO from CCAFS needs two burns of the upper stage.
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Offline Codemaster

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 Musk: on track for next launch, of SES satellite, next month; may wait a few weeks to finalize second stage relight issue. #falcon9

EDIT:
Musk: won't attempt recovery on next 2 launches to give customers for those missions maximum performance. #falcon9
« Last Edit: 09/29/2013 07:36 PM by Codemaster »

Offline douglas100

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Jeff Foust ‏@jeff_foust 44s

Musk: attempted relight of upper stage, encountered anomaly. Understand what it is and will fix before next flight. #falcon9

Re-light is a must for the SES flight. Wonder if this will delay it.

F9 flight 1 had a similar issue, but it was figures out by the next flight.

I'm sure they'll sort it. They've restarted the M-vac successfully before.

Edit: looks like Musk has answered my question.
« Last Edit: 09/29/2013 07:37 PM by douglas100 »
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Offline Skylab

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Musk: won't attempt recovery on next 2 launches to give customers for those missions maximum performance. #falcon9

Offline Skylab

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Jeff Foust ‏@jeff_foust now

Musk: will next attempt recovery on 4th F9 v1.1 launch, of CRS-3. That vehicle may also have landing legs. #falcon9

Offline Ronsmytheiii

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Jeff Foust ‏@jeff_foust now

Musk: will next attempt recovery on 4th F9 v1.1 launch, of CRS-3. That vehicle may also have landing legs. #falcon9

Wont they need to do more Grasshopper flights first to get the landing system down?  There is a big difference between landing in the middle of the ocean and an exact spot on land.
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Offline aero

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Don't suppose they are spin stabilizing S1 for descent, are they?
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Offline M129K

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Don't suppose they are spin stabilizing S1 for descent, are they?

Considering the problems this caused, I don't think so.

Online Silmfeanor

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Jeff Foust ‏@jeff_foust now

Musk: will next attempt recovery on 4th F9 v1.1 launch, of CRS-3. That vehicle may also have landing legs. #falcon9

Wont they need to do more Grasshopper flights first to get the landing system down?  There is a big difference between landing in the middle of the ocean and an exact spot on land.

Adding landing legs does not mean they will land it on land - they might just add them to test the shape of the stage, the diffirent center of gravity. I doubt they'll do full boostback - need to build a landing area for that first anyway.
So, same flight as today, just with added legs / leg deployment just above the ocean is a possibility.

Offline tigerade

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Musk: won't hold up CRS-3 launch to install legs on F9. Schedule driven by upgrades to Dragon. Probably Feb '14 launch. #falcon9

Offline Crispy

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Landing legs, even in their folded position, will give some aerodynamic resistance to roll.

Offline rcoppola

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Jeff Foust ‏@jeff_foust now

Musk: will next attempt recovery on 4th F9 v1.1 launch, of CRS-3. That vehicle may also have landing legs. #falcon9

Wont they need to do more Grasshopper flights first to get the landing system down?  There is a big difference between landing in the middle of the ocean and an exact spot on land.

Adding landing legs does not mean they will land it on land - they might just add them to test the shape of the stage, the diffirent center of gravity. I doubt they'll do full boostback - need to build a landing area for that first anyway.
So, same flight as today, just with added legs / leg deployment just above the ocean is a possibility.
It may be that their models show having the legs deployed may help in the rolling issues?
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Offline Skylab

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Jeff Foust ‏@jeff_foust 44s

Musk: working with Air Force and FAA on identifying landing sites for F9 1st stage, looking at eastern tip of Cape Canaveral. #falcon9

Offline douglas100

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Musk: won't hold up CRS-3 launch to install legs on F9. Schedule driven by upgrades to Dragon. Probably Feb '14 launch. #falcon9

An add-on option: that makes more sense.
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