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Snowpro

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You guys have heard me talking about Stennis Space Center and all the cool stuff that goes on out there for many years. Here's a link to a segment about the Space Shuttle Main Engine from the Science Channel show called How Do They Do It!

 

http://arunaurl.com/h3g Link is only good until 7/14/2007. It should pop up a new browser and give you an option to DL the WMV file.

 

There are several mistakes in the narration but you guys will get the general idea of what goes on during a test.

 

The statement about the "sheer size" of the engine is grossly misleading. One of the hallmarks of the Space Shuttle Main Engine is the compact size of the unit compared with previous liquid propellant rocket engines.

 

"more powerful than the carbines of four Hoover Dams"... WTF does that mean? I think the narration was trying to point out that while running a single SSME has a greater energy output than the "combined output of four Hoover Dams.

 

There is no such thing as a "dummy launch". Regular testing is considered "Flight Qualification" testing. Many years ago they were testing the limits of the SSME and learned that the design was quite robust. Because of this testing, the SSME is now rated for 104% of designed thrust. During a launch you can hear the call "go for throttle up" and know that they are running at 104%.

 

"for the past 20 years they've been dedicated to testing the Shuttle engines". Actually, just last year they celebrated the 30th anniversary of SSME testing. I've got a large commemorative medallion made with metal from an SSME to prove it.

 

Here's a PDF of that months newsletter with more background...

http://www.nasa.gov/centers/stennis/pdf/14...6_LAGNIAPPE.pdf

 

"the huge metal chambers are designed to keep the engine on the ground by channeling the thrust sideways instead of straight down." The huge metal chambers are called "flame deflectors" or "flame buckets. Since the engine is mounted vertically, the thrust is trying to lift the engine off the stand heading straight up. The sheer mass of the Test Stand is what keeps the engine in place.

 

The "40 mile exclusion zone" they talk about is actually the 40 square mile size of the entire facility. They moved an entire towns when they first established the "Mississippi Test Facility in the 1960's for the Apollo program.

 

The thing about the fuel being stored on "special barges" as a "safety precaution" is very misleading. One of the unique things about Stennis Space Center is that it has access to the Gulf of Mexico. Sure it's nice to keep the fuel and flame far apart but it wasn't done for safety.

 

The Apollo era Saturn V was constructed at the Michoud Facility in New Orleans and transported by barge to Stennis and the Cape. The External Tank for the Shuttle is still fabricated at Michoud and transported by barge. Since there are three main test stands at Stennis with barge access to each, they simply move the barges to the test stand being used.

 

The engines suck the fuel and oxidizer from the tanks into the engine while running. There is a separate pump for the LOX and LH systems that greatly increase the pressure from the tanks to operating levels within the engine.

 

More details here...

http://science.ksc.nasa.gov/shuttle/techno...ef/sts-mps.html

 

"Earth shattering roar". Well, I won't say it isn't loud but it certainly isn't "earth shattering". An actual launch is much louder since the Solid Rocket Motors are several orders of magnitude louder than the SSME. Additionally, the engine exhaust is directed inside the flame bucket and squelched by the water not only to cool the flame bucket but also act as an acoustic damper.

 

Here is the most accurate sound from an actual launch that I've ever heard. The tearing and rattling sound is very much like what you experience even as far away as the Banana River and Indian River public viewing sites. Obviously, the chest thumping low frequencies can't be reproduced faithfully.

http://www.marietta.edu/~mcshaffd/shuttle/shuttle.wav

 

During test that are open to the public, you're allowed to get within about a thousand feet of the side of the test stand from just about the same view as the camera position in the video. If you hold your hand out at arms length you can just about cover the test stand.

 

"the liquid hydrogen has combined with the liquid oxygen with explosive results". WRONG! The fuel and the oxidizer are ignited in the combustion chamber to produce thrust.

 

The test run for 480 seconds because that's exactly how long the engines are used during a launch.

 

Short video of a night test...

http://www.nasa.gov/centers/stennis/mpg/69...c_SSME_Test.mpg

 

Short video of the last "three-up" test back in 1996 on the B-1 test stand...

http://www.ssc.nasa.gov/sirs/movies/propul...peg/b1_test.mpg

 

Hope you guys enjoyed this!

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In-light of all the hoopla surrounding a recently released product, I thought this video was quite appropriate.

 

 

iSmoke. Don't breathe this!

 

I watched a bunch of those...funny stuff. I want a Blendtech Blender now.

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Aight here's the deal, post your dance-off, beatboxing, rap battle videos or anything else competitive in here, even 'yo momma' jokes are cool. I'll start with some Old School New York Funk, but you can counter with anything it doesn't have to be dance vs dance, it could be rap vs dance or vice versa. Let the games begin:

 

http://youtube.com/watch?v=eK79iIeE3W8

 

 

 

7485a0344lw1bw.gif

 

Bring it on biatch!!

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Bring it on biatch!!

 

Now to just figure out which one to use to pwn your butt....

 

 

I'm thinking Backstreet Boys oughta do it, maybe with a little Vanilla Ice, MJ, and AC/DC thrown in there.

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