Author Topic: LIVE: Delta-IV - WGS-05 - May 24, 2013  (Read 49283 times)

Offline Ben the Space Brit

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Re: LIVE: Delta-IV - WGS-05 - May 23, 2013
« Reply #40 on: 05/24/2013 12:49 pm »
Is the 9450 the most commonly used version of the Delta?
least and tie for least after this launch

Who calls it a "9450"?  ULA doesn't on their web site or in their literature.

 - Ed Kyle

Isn't that the Boeing model number?
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Offline PahTo

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Re: SCRUB: Delta-IV - WGS-05 - May 23, 2013
« Reply #41 on: 05/24/2013 03:00 pm »

Do all four SRMs ignite for/at liftoff?  I imagine even if they do all fire at the same time, they are jettisoned 2x2 in a staggered fashion (diametrically)--true?
I don't think I've ever seen this config--should be fun this evening!

Offline jacqmans

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Re: SCRUB: Delta-IV - WGS-05 - May 23, 2013
« Reply #42 on: 05/24/2013 03:02 pm »

Offline ugordan

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Re: SCRUB: Delta-IV - WGS-05 - May 23, 2013
« Reply #43 on: 05/24/2013 03:03 pm »

Do all four SRMs ignite for/at liftoff?  I imagine even if they do all fire at the same time, they are jettisoned 2x2 in a staggered fashion (diametrically)--true?
I don't think I've ever seen this config--should be fun this evening!

4 SRMs: http://www.youtube.com/watch?v=1bUOT_jcYjE

Offline PahTo

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #44 on: 05/24/2013 03:17 pm »

Thanks ugordan.

Offline 00rs250

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #45 on: 05/24/2013 03:29 pm »
Well, my statement from yesterday is an understatement for today!
Half hour away from the best place to leave earth!

Offline jacqmans

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #46 on: 05/24/2013 05:02 pm »
InsideKSC‏@InsideKSC

Your 11 a.m. Delta IV #WGS5 launch status update: pic.twitter.com/isT1Oaq5dH


Offline jacqmans

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #47 on: 05/24/2013 06:32 pm »
The team has the "Go" to begin cryogenic fueling operations on the #DeltaIV with #WGS5.


Offline Chris Bergin

Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #48 on: 05/24/2013 06:49 pm »
William Graham's excellent launch/mission overview:

http://www.nasaspaceflight.com/2013/05/ula-delta-iv-launch-wgs-5-satellite/
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Offline Prober

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #49 on: 05/24/2013 06:53 pm »
William Graham's excellent launch/mission overview:

http://www.nasaspaceflight.com/2013/05/ula-delta-iv-launch-wgs-5-satellite/

Enjoyed the article with the full history William.
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Offline PahTo

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #50 on: 05/24/2013 07:59 pm »
Follow-up per Mr. Graham's wonderfully detailed article, and per jacqman's image a page back (div_wgs5_r5)--it appears the SRMs are indeed different--may just be camera angle, but...

Do the TVC-equipped SRMs actually burn slightly longer?  If so (and maybe even if not), I assume they assist with mitigating transients resulting from the first set of SRMs separating.

Is TVC electro-mechanical as it is with Castor30?

Best wishes for a successful mission!

Offline Jim

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #51 on: 05/24/2013 08:11 pm »

1.  Do the TVC-equipped SRMs actually burn slightly longer?  If so (and maybe even if not), I assume they assist with mitigating transients resulting from the first set of SRMs separating.

2. Is TVC electro-mechanical as it is with Castor30?


1.  No and no, since they are burned out.

2.  Blowdown Hydraulic.

Offline PahTo

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #52 on: 05/24/2013 08:14 pm »

Thanks Jim.  Time to research blowdown hydraulic...
:)

Offline Chris Bergin

Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #53 on: 05/24/2013 08:42 pm »
ULA:

Everything is progressing toward a launch at 8:27 p.m. of the WGS-5 satellite for the U.S. Air Force.

Fueling is underway.
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Offline Nick L.

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #54 on: 05/24/2013 09:06 pm »

Thanks Jim.  Time to research blowdown hydraulic...
:)

In a blowdown hydraulic system the hydraulic fluid is pressurized by a fixed amount of pressurized gas, as opposed to by a hydraulic pump. A consequence of this is that you have to dump the hydraulic fluid overboard as you move the actuators, and so if you move the nozzles a lot more than you anticipated you can run out of hydraulic fluid (this is what happened to the first Delta III).

Edit: A little OT, but here's a document that compares the Japanese H-IIA to its predecessor, the H-II, and talks about the cost and reliability improvements. Page 48 discusses the change from a pump-driven closed system to a blowdown system for the first stage TVC:
https://www.mhi.co.jp/technology/review/pdf/e392/e392043.pdf
« Last Edit: 05/24/2013 09:29 pm by Nick L. »
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Offline PahTo

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #55 on: 05/24/2013 09:13 pm »

Thanks Nick L.  It seems such a system is less complex, has less mass and less cost than a "traditional" hydraulic system of pump-fed actuators.  Considering the RS-68 has TVC, I imagine running out of fluid is less of a concern.

Offline jacqmans

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #56 on: 05/24/2013 10:19 pm »
#WGS5 will launch on #DeltaIV Medium+ (5.4). Here's a cutaway view of the 5-meter series:

http://www.ulalaunch.com/site/docs/products/Cutaways/DeltaIVM5Meter_Cutaway.pdf

Offline Chris Bergin

Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #57 on: 05/24/2013 10:31 pm »
ULA:

T-2 Hours.

The team is not currently working any technical issues that would prohibit an on-time launch at 8:27 p.m. of the WGS-5 satellite for the U.S. Air Force.
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Offline Rocket Science

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #58 on: 05/24/2013 11:42 pm »
T-minus 4 minutes and holding. The countdown has entered the planned 45-minute hold.
"The laws of physics are unforgiving"
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Offline Prober

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Re: LIVE: Delta-IV - WGS-05 - May 24, 2013
« Reply #59 on: 05/24/2013 11:45 pm »
found a couple of pics
« Last Edit: 05/24/2013 11:47 pm by Prober »
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