Author Topic: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION  (Read 501017 times)

Offline butters

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1000 on: 05/31/2012 03:15 pm »
Whew... that trunk sep confirmation came later than I expected.

Now we're only left with stuff that has already been tested on COTS-1!

Offline Rex Chan

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1001 on: 05/31/2012 03:16 pm »
Is that Garrett Reisman on console, front row at MCC-X?


I can't seem to find Elon.

I think that he is in a separate room. At least that seemed to be the case in the video showing him during the launch.

Lots of people in the control room - no empty seats.
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Online ugordan

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1002 on: 05/31/2012 03:16 pm »
Now we're only left with stuff that has already been tested on COTS-1!

I imagine folks felt the same way about SA-502 after SA-501...

Offline Robert Thompson

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1003 on: 05/31/2012 03:18 pm »
What are the maximum g's for this deceleration?

Offline yg1968

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1004 on: 05/31/2012 03:20 pm »
Why do they jettisonned the Trunk so late?
You de-orbit with it to control when it re-enters.  (Like Soyuz does.)

So that the trunk doesn't because space debris? It seems like an additionnal failure point (especially if you had crew in the capsule).

Offline sanman

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1005 on: 05/31/2012 03:20 pm »
We had a nice camera view all the way up, so why can't we get a similar camera view while coming down?

I know there's a blackout period due to re-entry plasma, but outside of that can't they give us something?

Offline Andy USA

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1006 on: 05/31/2012 03:20 pm »
Whoops! Sorry to two members, I accidentally thought this was the live thread and deleted two posts about MCC-X looking professional. Please repost, and I'm sorry! So embarrassing!

Offline psloss

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1007 on: 05/31/2012 03:21 pm »
Why do they jettisonned the Trunk so late?
You de-orbit with it to control when it re-enters.  (Like Soyuz does.)

So that the trunk doesn't because space debris? It seems like an additionnal failure point (especially if you had crew in the capsule).
Same as Soyuz and previous vehicles like this.

Offline jongoff

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1008 on: 05/31/2012 03:23 pm »
Why do they jettisonned the Trunk so late?
You de-orbit with it to control when it re-enters.  (Like Soyuz does.)

So that the trunk doesn't because space debris? It seems like an additionnal failure point (especially if you had crew in the capsule).

If it didn't separate on a manned flight, they might be able to do an abort burn to raise the perigee back up to give them time to troubleshoot and fix. That would likely imply having to do a water landing though, because they would have burned more propellant on the abort back to orbit, and the second deorbit burn.

~Jon

Offline Chandonn

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1009 on: 05/31/2012 03:24 pm »
I think the trunk is jettisoned after the burn just in case the burn is unsuccessful -- you still have the solar arrays for power until you can troubleshoot and try the burn again

Offline VatTas

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1010 on: 05/31/2012 03:24 pm »
Almost 11000 viewers on SpaceX live feed  :o

Offline sanman

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1011 on: 05/31/2012 03:25 pm »
If crewed Dragon had to do a water landing, would they use the SuperDracos, or just go with chutes?

Offline Lars_J

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1012 on: 05/31/2012 03:28 pm »
Why do they jettisonned the Trunk so late?
You de-orbit with it to control when it re-enters.  (Like Soyuz does.)

So that the trunk doesn't because space debris? It seems like an additionnal failure point (especially if you had crew in the capsule).

If it didn't separate on a manned flight, they might be able to do an abort burn to raise the perigee back up to give them time to troubleshoot and fix. That would likely imply having to do a water landing though, because they would have burned more propellant on the abort back to orbit, and the second deorbit burn.

I don't see how they could - would they really have that much margin for another ~150 m/s burn? (my guesstimate for a minimal orbit + another deorbit burn)

I think you just have to accept that failure to separate trunk is a LOC event. Unless it is just hanging on by a thread, like what has happened on at least one Soyuz flight. I'm not sure Dragon has the same margin as Soyuz to handle such a thing, though.

Offline Rex Chan

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1013 on: 05/31/2012 03:29 pm »
SpaceX During today's descent, dual drogue parachutes will deploy at 45,000 feet to stabilize and slow #Dragon.

I thought Dragon used 3 parachutes?

My bad - Google gas just informed me drogue chutes are the smaller, initial chutes used to pull the bigger, main ones out. Oops.
« Last Edit: 05/31/2012 03:32 pm by Rex Chan »
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Offline Rocket Science

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1014 on: 05/31/2012 03:29 pm »
Just off the coast on SpaceX's map... :)
"The laws of physics are unforgiving"
~Rob: Physics instructor, Aviator

Offline Chris-A

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1015 on: 05/31/2012 03:29 pm »
Almost 11000 viewers on SpaceX live feed  :o

The webmaster embedded the NASA HD feed from Ustream. The viewer count is total of all embedded videos with that feed.

Offline jongoff

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1016 on: 05/31/2012 03:30 pm »
Why do they jettisonned the Trunk so late?
You de-orbit with it to control when it re-enters.  (Like Soyuz does.)

So that the trunk doesn't because space debris? It seems like an additionnal failure point (especially if you had crew in the capsule).

If it didn't separate on a manned flight, they might be able to do an abort burn to raise the perigee back up to give them time to troubleshoot and fix. That would likely imply having to do a water landing though, because they would have burned more propellant on the abort back to orbit, and the second deorbit burn.

I don't see how they could - would they really have that much margin for another ~150 m/s burn? (my guesstimate for a minimal orbit + another deorbit burn)

I think you just have to accept that failure to separate trunk is a LOC event. Unless it is just hanging on by a thread, like what has happened on at least one Soyuz flight. I'm not sure Dragon has the same margin as Soyuz to handle such a thing, though.

I think the landing event (deceleration plus gravity losses during the burn) would likely be more than 150m/s.

~Jon

Offline e of pi

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1017 on: 05/31/2012 03:30 pm »
SpaceX During today's descent, dual drogue parachutes will deploy at 45,000 feet to stabilize and slow #Dragon.

I thought Dragon used 3 parachutes?
Dual drogues, then three main chutes IIRC.

Offline yg1968

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1018 on: 05/31/2012 03:33 pm »
If crewed Dragon had to do a water landing, would they use the SuperDracos, or just go with chutes?

We are not even sure that crewed Dragon will have chutes. I am guessing that it will but I don't think that we know for sure. 

Offline Rocket Science

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Re: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION
« Reply #1019 on: 05/31/2012 03:33 pm »
Visual!
"The laws of physics are unforgiving"
~Rob: Physics instructor, Aviator

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