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View Full Version : What stops the shuttle toppling over on the pad?



Ricardodaforce
2009-Mar-16, 07:12 PM
How does it stay upright? It looks like it should topple onto its back.

01101001
2009-Mar-16, 07:27 PM
How does it stay upright? It looks like it should topple onto its back.

Hold down posts (http://spaceflight.nasa.gov/shuttle/reference/shutref/srb/posts.html)


Each solid rocket booster has four hold- down posts that fit into corresponding support posts on the mobile launcher platform. Hold- down bolts hold the SRB and launcher platform posts together. Each bolt has a nut at each end, but only the top nut is frangible. The top nut contains two NASA standard detonators, which are ignited at solid rocket motor ignition commands.

Wikipedia: Space Shuttle Solid Rocket Booster :: Hold-down posts (http://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_Booster#Hold-down_posts)

Cool part is that if the explosive bolts fail to release, when the SRBs ignite, they'll just tear themselves off the launchpad anyway.

Topic: Why doesn't the Space Shuttle tip over? (http://www.bautforum.com/space-astronomy-questions-answers/45397-why-doesnt-space-shuttle-tip-over.html)

mugaliens
2009-Mar-16, 08:20 PM
Cool part is that if the explosive bolts fail to release, when the SRBs ignite, they'll just tear themselves off the launchpad anyway.

That's "cool?" Sounds like it could be calamity!

I hope those sensors don't just detect the ignition signal going to the SRBs, but they detect the...

Oh, I get it. The SRBs aren't ignited until the SME's are up and running, so if the explosive bolts fail to give way, there could be a serious problem, so they're designed to fail so long as you have full SRB thrust...

No calamity. Sweet.

Gee! Those NASA guys think of everything!

Well, most everything.

jlhredshift
2009-Mar-16, 08:26 PM
That's "cool?" Sounds like it could be calamity!

I hope those sensors don't just detect the ignition signal going to the SRBs, but they detect the...

Oh, I get it. The SRBs aren't ignited until the SME's are up and running, so if the explosive bolts fail to give way, there could be a serious problem, so they're designed to fail so long as you have full SRB thrust...

No calamity. Sweet.

Gee! Those NASA guys think of everything!

Well, most everything.


Sort of like the shear bolts on a roto tiller.

Swift
2009-Mar-16, 08:54 PM
Sort of like the shear bolts on a roto tiller.
Getting the garden ready to plant the peas are we? ;)