Author Topic: STS-126: SSME Ignition in Super Slow Mo Video  (Read 59451 times)

Offline rtphokie

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #20 on: 06/09/2009 02:39 PM »
is the original, longer video available somewhere.

Offline stockman

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #21 on: 06/09/2009 02:44 PM »
is the original, longer video available somewhere.

L2
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Offline rtphokie

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #22 on: 06/09/2009 02:45 PM »
is the original, longer video available somewhere.

L2

I figured as much, where on L2?

Offline stockman

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #23 on: 06/09/2009 02:47 PM »
is the original, longer video available somewhere.

L2

I figured as much, where on L2?

If you have a subscription to L2 simply do a SEARCH on "QUvis" - I think the STS126 one is the first hit..
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Offline rtphokie

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #24 on: 06/09/2009 02:51 PM »
is the original, longer video available somewhere.

L2

I figured as much, where on L2?

If you have a subscription to L2 simply do a SEARCH on "QUvis" - I think the STS126 one is the first hit..

Got it now, thanks!

Offline Longhorn John

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #25 on: 06/12/2009 03:37 PM »
Super impressive. Good idea to link in the latest article on the super slo mo vids.

Offline TonyJ73

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #26 on: 02/08/2010 04:26 AM »
Never seen that before, how it goes from orange to blue as the LOX is mixed in.

Offline LarryL8

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #27 on: 07/17/2010 06:04 PM »
Big fan of the SSMEs, that is a beautiful sight seeing it come to life.

Offline Tommy E

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #28 on: 02/17/2011 08:29 PM »
Hello everybody. Read the news storys all the time but first time on the forum. Sorry for the stupid question but why do the SSMEs take a few seconds to ignite and power up and the SRBs fire up almost immediately?

Awesome video.
8th Grader future astronaut. Love Space Shuttle.

Online ChrisGebhardt

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #29 on: 02/17/2011 08:33 PM »
Hello everybody. Read the news storys all the time but first time on the forum. Sorry for the stupid question but why do the SSMEs take a few seconds to ignite and power up and the SRBs fire up almost immediately?

Awesome video.

Because of the way liquid v. solid engines work.

Offline Tommy E

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #30 on: 02/17/2011 08:39 PM »
Hello everybody. Read the news storys all the time but first time on the forum. Sorry for the stupid question but why do the SSMEs take a few seconds to ignite and power up and the SRBs fire up almost immediately?

Awesome video.

Because of the way liquid v. solid engines work.

So that is why Ares I-X ignited and went up straight away. But Delta 4's are liquid and that seemed to go up straight away too?
8th Grader future astronaut. Love Space Shuttle.

Online ugordan

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #31 on: 02/17/2011 08:40 PM »
Because of the way liquid v. solid engines work.

That's really cutting it short. A pressure-fed liquid engine could have just as fast a startup.

A less short answer would be because the SSME is an incredibly complex piece of hardware with complex propellant flow paths, etc. It takes time to spin the turbopumps up to speed and reach full thrust. Big engines tend to need several seconds to really get going.

Online ugordan

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #32 on: 02/17/2011 08:41 PM »
But Delta 4's are liquid and that seemed to go up straight away too?

Delta IV engine starts ignition at about 6 seconds before liftoff as well.

Offline Tommy E

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #33 on: 02/17/2011 08:42 PM »
Big engines tend to need several seconds to really get going.

And that explains Saturn V. That took time to build up and the announcer says "all engines running" when still on the pad and then it went up :)

Cool, thank you.
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Online ChrisGebhardt

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #34 on: 02/17/2011 08:43 PM »
Hello everybody. Read the news storys all the time but first time on the forum. Sorry for the stupid question but why do the SSMEs take a few seconds to ignite and power up and the SRBs fire up almost immediately?

Awesome video.

Because of the way liquid v. solid engines work.

So that is why Ares I-X ignited and went up straight away. But Delta 4's are liquid and that seemed to go up straight away too?

Delta-4 does not do what you claim. Engine ignition occurs at T-7secs for the Delta-4. Liftoff is at T0.
« Last Edit: 02/17/2011 08:46 PM by ChrisGebhardt »

Online Chris Bergin

Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #35 on: 12/01/2011 08:17 PM »
Bump due to conversation about RS-25s on the Con Ops thread in the SLS section.

Offline Liryc

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #36 on: 03/14/2012 12:19 PM »
Hey guys !

Just found this thread, and had to say, the video is just great !

One question though : what about the water deluge system on the SSME ?
On the we can see the rainbirds flooding the SRB side of the MLP with water, but what about the SSME ?
I guess there must be some water deluge there too ?
I've seen it already, but couldn't find the source anymore..

Cheers !
Cyril

Offline Jim

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #37 on: 03/14/2012 12:48 PM »
Hey guys !

Just found this thread, and had to say, the video is just great !

One question though : what about the water deluge system on the SSME ?
 we can see the rainbirds flooding the SRB side of the MLP with water, but what about the SSME ?
I guess there must be some water deluge there too ?
I've seen it already, but couldn't find the source anymore..


There is a deluge in the SSME duct but there is not one needed on the top side.  The rainbirds are not there for the SRB exhaust, notice that they do not "come on" until after liftoff.  The rainbirds cover the deck of the MLP with water so that the acoustic noise from the vehicle does not reflect of the deck and damage the vehicle.

Offline Liryc

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #38 on: 03/14/2012 03:05 PM »
Ok, thanks !

Offline Liryc

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Re: STS-126: SSME Ignition in Super Slow Mo Video
« Reply #39 on: 03/15/2012 02:08 PM »
There is a deluge in the SSME duct but there is not one needed on the top side.  The rainbirds are not there for the SRB exhaust, notice that they do not "come on" until after liftoff.  The rainbirds cover the deck of the MLP with water so that the acoustic noise from the vehicle does not reflect of the deck and damage the vehicle.

Allright. Is it the same for the deluge in the SRB holes ? Is it also set up ater lift off or before the SRB ignition ?

this is the system i'm talking about :



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