Author Topic: SpaceX Falcon 9/Dragon COTS Demo (C2+) GENERAL DISCUSSION (Read 510312 times)

subzero788 · « **Reply #980 on:** 05/31/2012 02:57 pm »

Quote from: peter-b on 05/31/2012 10:19 am

From what the NASA PAO said on the broadcast (something about "removing chemicals"), it sounds like prop unloading will be taking place at McGregor.

Just heard the NASA PAO clearly state that dragon prop would be unloaded at McGregor (or words to that affect). So that's settled!

sanman · « **Reply #981 on:** 05/31/2012 02:58 pm »

Quote from: Hernalt on 05/31/2012 02:57 pm

Does that hypergolic fuel get cleaned up and reused?

I thought Shuttle purged its fuel before re-entry -- doesn't Dragon do the same?

VatTas · « **Reply #982 on:** 05/31/2012 02:58 pm »

Quote from: Rex Chan on 05/31/2012 02:50 pm

Oops! Was referring to the first part of the tweet - that *this* Dragon can fire Draco in atmo to target splashdown area. I just thought it was all parachutes and the de-orbit burn.

C-1 Dragon also did that as far as I remember.

Eer · « **Reply #983 on:** 05/31/2012 02:58 pm »

Quote from: Rex Chan on 05/31/2012 02:56 pm

Quote from: Eer on 05/31/2012 02:55 pm
Question - they say the Dragon de-orbit burn is a 100m per second burn.

1g, if I recall, is about 10m/s.

Does that mean Dragon is experiencing ~10g deceleration?

That change in velocity of 100 m/s takes 9 minutes, so probably not.

Ok - thanks - 100m/s total velocity change, not 100m/s per second velocity change.

Robert Thompson · « **Reply #984 on:** 05/31/2012 02:59 pm »

Quote from: sanman on 05/31/2012 02:58 pm

Quote from: Hernalt on 05/31/2012 02:57 pm
Does that hypergolic fuel get cleaned up and reused?

I thought Shuttle purged its fuel before re-entry -- doesn't Dragon do the same?

Need a Dragon tshirt, "Reduce Reuse Recycle"

corrodedNut · « **Reply #985 on:** 05/31/2012 03:00 pm »

Is that Garrett Reisman on console, front row at MCC-X?

psloss · « **Reply #986 on:** 05/31/2012 03:01 pm »

Quote from: sanman on 05/31/2012 02:58 pm

I thought Shuttle purged its fuel before re-entry

Some of it, not all.

yg1968 · « **Reply #987 on:** 05/31/2012 03:02 pm »

Quote from: Chris Bergin on 05/31/2012 02:57 pm

Trunk jettison at 10:09 Central (11 minutes from now).

What happens if the trunk fails to jettison. Would it simply burn up?

ugordan · « **Reply #988 on:** 05/31/2012 03:03 pm »

Quote from: yg1968 on 05/31/2012 03:02 pm

What happens if the trunk fails to jettison. Would it simply burn up?

Eventually, but it could pose controlability problems for the capsule and make entry uncontrolled, exposing portions with little to no TPS to the reentry flow.

sanman · « **Reply #989 on:** 05/31/2012 03:03 pm »

Quote from: yg1968 on 05/31/2012 03:02 pm

What happens if the trunk fails to jettison. Would it simply burn up?

I'd imagine having that big thing still attached would cause Dragon to tumble out of control, wouldn't it?

Rex Chan · « **Reply #990 on:** 05/31/2012 03:07 pm »

*How* do they get the trunk to sep? Is it a pusher like 1st/2nd stage?

Chris-A · « **Reply #991 on:** 05/31/2012 03:08 pm »

Quote from: corrodedNut on 05/31/2012 03:00 pm

Is that Garrett Reisman on console, front row at MCC-X?

I can't seem to find Elon.

corrodedNut · « **Reply #992 on:** 05/31/2012 03:09 pm »

Quote from: Chris-A on 05/31/2012 03:08 pm

Quote from: corrodedNut on 05/31/2012 03:00 pm
Is that Garrett Reisman on console, front row at MCC-X?

I can't seem to find Elon.

Maybe he went "boating"?

yg1968 · « **Reply #993 on:** 05/31/2012 03:11 pm »

Quote from: ugordan on 05/31/2012 03:03 pm

Quote from: yg1968 on 05/31/2012 03:02 pm
What happens if the trunk fails to jettison. Would it simply burn up?

Eventually, but it could pose controlability problems for the capsule and make entry uncontrolled, exposing portions with little to no TPS to the reentry flow.

Thanks. Why do they jettisonned the trunk so late? Are the solar panels needed for the descent?

Chandonn · « **Reply #994 on:** 05/31/2012 03:11 pm »

No, Elon's been in the secret compartment on Dragon this whole time...

Rocket Science · « **Reply #995 on:** 05/31/2012 03:11 pm »

Looks like him...

yg1968 · « **Reply #996 on:** 05/31/2012 03:12 pm »

Quote from: Chris-A on 05/31/2012 03:08 pm

Quote from: corrodedNut on 05/31/2012 03:00 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.

psloss · « **Reply #997 on:** 05/31/2012 03:13 pm »

Quote from: yg1968 on 05/31/2012 03:11 pm

Why do they jettisonned the Trunk so late?

You de-orbit with it to control when it re-enters. (Like Soyuz does.)

Chris-A · « **Reply #998 on:** 05/31/2012 03:14 pm »

I have two places I think, the center left tables, or the 3rd row on the left side of the video feed.

beancounter · « **Reply #999 on:** 05/31/2012 03:14 pm »

Sep confirmed, whoopee!!!