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SpaceX launch and landing attempt scheduled for Sunday



 
 
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  #11  
Old December 22nd 15, 07:54 PM posted to sci.space.policy
Jeff Findley[_6_]
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Default SpaceX launch and landing attempt scheduled for Sunday

In article ,
says...

perhaps the rockets exhaust moves the bardge laning more difficult.


This is surely a far smaller force than ocean waves.

since a pad landing is easier and safer its not a problem,


For flights that have enough fuel margin this is true. But, Elon Musk
has stated (on Twitter) that for the Falcon Heavy, they'll still need to
use a barge to recover the core stage. It will fly higher, faster, and
further downrange than Falcon 9's first stage. The Falcon Heavy
boosters should be able to fly back to Landing Complex 1.

get the stage back, inspect and refurb and fly again.


In theory. But this stage will not fly again. Musk says it's too
historic and does not want to lose it. He's also said it will be used
at their new launch pad at KSC (former shuttle pad) for pad fit checks.
He's also stated that they will likely test this stage, on the ground,
to prove that it could have flown again.

My guess is this recovered stage will eventually find its way back to
SpaceX headquarters in California. The first flown Dragon is hanging
there (and was visible in the live video stream of this last flight when
the cameras were on the crowd of SpaceX employees who were watching the
flight on screens at their HQ). These artifacts are surely quite
inspirational to SpaceX employees and represent their historic
achievements as a private company.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer
  #12  
Old December 22nd 15, 09:32 PM posted to sci.space.policy
Bob Haller
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Posts: 3,197
Default SpaceX launch and landing attempt scheduled for Sunday

On Tuesday, December 22, 2015 at 1:54:10 PM UTC-5, Jeff Findley wrote:
In article ,
says...

perhaps the rockets exhaust moves the bardge laning more difficult.


This is surely a far smaller force than ocean waves.

since a pad landing is easier and safer its not a problem,


For flights that have enough fuel margin this is true. But, Elon Musk
has stated (on Twitter) that for the Falcon Heavy, they'll still need to
use a barge to recover the core stage. It will fly higher, faster, and
further downrange than Falcon 9's first stage. The Falcon Heavy
boosters should be able to fly back to Landing Complex 1.

get the stage back, inspect and refurb and fly again.


In theory. But this stage will not fly again. Musk says it's too
historic and does not want to lose it. He's also said it will be used
at their new launch pad at KSC (former shuttle pad) for pad fit checks.
He's also stated that they will likely test this stage, on the ground,
to prove that it could have flown again.

My guess is this recovered stage will eventually find its way back to
SpaceX headquarters in California. The first flown Dragon is hanging
there (and was visible in the live video stream of this last flight when
the cameras were on the crowd of SpaceX employees who were watching the
flight on screens at their HQ). These artifacts are surely quite
inspirational to SpaceX employees and represent their historic
achievements as a private company.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer


Or it could end up in the NASM.......
  #15  
Old December 24th 15, 03:08 PM posted to sci.space.policy
Jeff Findley[_6_]
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Posts: 2,307
Default SpaceX launch and landing attempt scheduled for Sunday

In article om,
says...

On 2015-12-23 11:43, Jeff Findley wrote:

But, given the high cost of dismantling the thing to its component
parts, I'm betting it won't go that far. I'd expect Musk to have major
components visually inspected and cleaned and have the thing static test
fired for full duration to "prove" it could have been reused.



While this is the first they have recovered "dry", Wouldn't the ones
they recovered from water (unexploded) provide very good hints on how
the insides of the engines behaved ? Wouldn't inside stuff like
turbopumps etc be salt-water free ? or does salt water get in those too ?


I don't believe they successfully recovered any other first stages
intact. From memory, all of the stages which were "soft landed" on the
ocean were never recovered. From what I understand, wave action
destroyed their structural integrity in a short period of time and they
sank before they could be recovered.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer
  #16  
Old December 27th 15, 11:11 PM posted to sci.space.policy
David Spain
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Posts: 2,901
Default SpaceX launch and landing attempt scheduled for Sunday

On 12/22/2015 1:54 PM, Jeff Findley wrote:


For flights that have enough fuel margin this is true. But, Elon Musk
has stated (on Twitter) that for the Falcon Heavy, they'll still need to
use a barge to recover the core stage. It will fly higher, faster, and
further downrange than Falcon 9's first stage. The Falcon Heavy
boosters should be able to fly back to Landing Complex 1.


Not only for Falcon Heavy, but from what I've read elsewhere there are
also flight profiles of Falcon 9 that will require barge landing because
there won't be enough reserve fuel for a RTLS landing. IIRC some of
those involving GTO injections. Possibly payload mass as well.

Noted the long burn time for the 2nd stage on this flight. Was it the
longest SpaceX has performed so far? I'll have to do some fact checking...

I suspect barge landing attempts will continue. But perhaps only on
those profiles that require them? It will be interesting to follow...

Dave



 




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