#11
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Atlas SRBs
"Pat Flannery" wrote in message
... Scott Lowther wrote: Easy to see. A pressure vessel like this can withstand several thousan psi internal pressure, because the pressure is even, and the case walls are in tension... but like an empty beer can, it's easily squashed by uneven external pressure. Think of the Atals. Supported by internal pressure. Yeah, but this thing is very small compared to the Atlas; it's a little over 3 feet in diameter by about 30 feet long; and it seems to me that any material capable of taking the internal pressure of the burning fuel would be able to take the stress of freefall, given that the casing/nozzle weighs over 3,000 pounds minus fuel...is the damage caused by aerodynamic stress when the thing gets jettisoned during the rocket's ascent? It burns for 53 seconds; what altitude and speed is the Atlas at after 53 seconds? Pat Don't forget that, for the Atlas 2AS, 2 solids are ground-lit, while the other 2 are air-lit, thus being jettisoned late in flight. Paul |
#12
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Pat Flannery wrote:
{...] of steam the heat is removed and the cap screwed on...as it cools, the can collapses...due to the steam condensing into water and creating a partial vacuum in it. Early steam engine worked on this principle; sucking the piston into a steam-filled cylinder as the steam was condensed by a spray of cold water introduced into the cylinder. It wasn't the greatest thing in regards to horsepower for weight- but it didn't have a danger of exploding either. As I understand it, very few conventional steam cylinders exploded. It was usually the steam generator (aka boiler) that went, usually when the crown sheets got uncovered and then hit with water when someone tried to catch up. (For locomotives, that often happened on hills) (and for steam-powered launch vehicles, that often happened right after "roll program" was called out) /dps |
#13
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dave schneider wrote:
As I understand it, very few conventional steam cylinders exploded. It was usually the steam generator (aka boiler) that went, usually when the crown sheets got uncovered and then hit with water when someone tried to catch up. This early type relied on steam that had just enough pressure to fill the empty cylinder; about what comes out of you teapot at home; some of these "Atmospheric Steam Engines " were very large in size to generate significant amounts of power, as you were relying on the air pressure of Earth's atmosphere to do the work. You can read up on them he http://www.egr.msu.edu/~lira/supp/steam/ In this type of engine, the cylinder had to have enough strength to resist _implosion_ as the piston was sucked into it. One can see the headlines now: "Steam engine implodes, over one hundred somewhat startled!" Pat |
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Pat Flannery wrote:
Yeah, but this thing is very small compared to the Atlas; it's a little over 3 feet in diameter by about 30 feet long; and it seems to me that any material capable of taking the internal pressure of the burning fuel would be able to take the stress of freefall, While I don't know the Castor cases specifically... It's a counter-intuitive fact that lightweight modern composite cases 9which I'd assuem these are) are astonishingly fragile. I've seen soem fiberwoudn tanks that are meant for 2000 psi, internally... that you could smash with a girlie punch. -- Scott Lowther, Engineer Remove the obvious (capitalized) anti-spam gibberish from the reply-to e-mail address |
#15
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Pat Flannery wrote:
[...] http://www.egr.msu.edu/~lira/supp/steam/ In this type of engine, the cylinder had to have enough strength to resist _implosion_ as the piston was sucked into it. Blink! :-o /dps |
#16
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dave schneider wrote:
Pat Flannery wrote: [...] http://www.egr.msu.edu/~lira/supp/steam/ In this type of engine, the cylinder had to have enough strength to resist _implosion_ as the piston was sucked into it. Blink! :-o On Earth the difference between a vacuum and the pressure of the atmosphere is only around 14.7 PSI at sea level, so you can't generate much power with one of these things without making it very large; but if you could figure out how to pull something like this off on the surface of _Venus_, for instance..... Pat |
#17
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On Tue, 10 Feb 2004 22:11:15 -0800 (PST), in a place far, far away,
Pat Flannery made the phosphor on my monitor glow in such a way as to indicate that: http://www.egr.msu.edu/~lira/supp/steam/ In this type of engine, the cylinder had to have enough strength to resist _implosion_ as the piston was sucked into it. On Earth the difference between a vacuum and the pressure of the atmosphere is only around 14.7 PSI at sea level, so you can't generate much power with one of these things without making it very large; You mean like a Newcomen engine? The one that kicked off the Industrial Revolution? http://technology.niagarac.on.ca/peo...e/newcomen.htm It did, admittedly, have a poor power/weight ratio... |
#18
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Has anyone ever tried to scuba dive in the area to recover these...they
could be marketable to collectors...would that even be legal? "Rand Simberg" wrote in message .. . On Tue, 10 Feb 2004 22:11:15 -0800 (PST), in a place far, far away, Pat Flannery made the phosphor on my monitor glow in such a way as to indicate that: http://www.egr.msu.edu/~lira/supp/steam/ In this type of engine, the cylinder had to have enough strength to resist _implosion_ as the piston was sucked into it. On Earth the difference between a vacuum and the pressure of the atmosphere is only around 14.7 PSI at sea level, so you can't generate much power with one of these things without making it very large; You mean like a Newcomen engine? The one that kicked off the Industrial Revolution? http://technology.niagarac.on.ca/peo...e/newcomen.htm It did, admittedly, have a poor power/weight ratio... |
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