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Did Apollo do a burn prior to re-entry?
to slow it down? It was going , what, about 25,000 MPH?
Or did it "crash" squarely enough into the atmosphere that it didn't need to? |
#2
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Did Apollo do a burn prior to re-entry?
On Fri, 02 Mar 2007 21:24:18 GMT, in a place far, far away,
made the phosphor on my monitor glow in such a way as to indicate that: to slow it down? No. Or did it "crash" squarely enough into the atmosphere that it didn't need to? It needed to do a correction burn to ensure the proper angle at entry interface, but not to slow it down. That's what the atmosphere is for. |
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Did Apollo do a burn prior to re-entry?
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#4
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Did Apollo do a burn prior to re-entry?
"PP" wrote in message
to slow it down? It was going , what, about 25,000 MPH? Or did it "crash" squarely enough into the atmosphere that it didn't need to? Coasting in from the moon's L1, being roughly 325,740 km away from Earth, say passing through that nullification point at something better than a km/s, you'd think that our return velocity prior to atmospheric reentry would have become impressive, to say the least. Too bad there's not a computer simulator for running off such complex orbital mechanic stuff, such as in 3D animation format with the time compressed at 60:1 or even 3600:1. Perhaps China or India can accommodate such basic needs. - Brad Guth -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
#5
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Did Apollo do a burn prior to re-entry?
In article , wrote:
to slow it down? It was going , what, about 25,000 MPH? No, no braking burn -- beefing up the heatshield to take a bit more heat used far less mass than rocket braking would have. Or did it "crash" squarely enough into the atmosphere that it didn't need to? Nothing "crash" or "square" about it -- a carefully-controlled entry at a very shallow angle, using body lift to shape the path and hold the capsule down in the atmosphere until it had lost enough speed that it wasn't going to skip back out. -- spsystems.net is temporarily off the air; | Henry Spencer mail to henry at zoo.utoronto.ca instead. | |
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Did Apollo do a burn prior to re-entry?
"Brad Guth" wrote in message
news:7e13df96250b39eaec9ec602e7121e6e.49644@mygate .mailgate.org Actually, the return from the moon had to be crossing the moon's L1 zone at something better than 1 km/s, perhaps at 1.5 if not nearly 2 km/s, and from that point on it would have been increasing in velocity as being pulled towards Earth, giving it a rather spiffy orbital reentry velocity that only a great deal of aerobraking could have managed to have moderated that velocity down to the dull roar of being similar to but still faster than the shuttle reentry velocity. Is there any replicated proof that our NASA/Apollo wizards spent any actual time within the moon's L1? (such as most of their time, as their otherwise fully robotic portions of their mission went into lunar orbit) - Brad Guth -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Did Apollo do a burn prior to re-entry?
Henry Spencer wrote: Nothing "crash" or "square" about it -- a carefully-controlled entry at a very shallow angle, using body lift to shape the path and hold the capsule down in the atmosphere until it had lost enough speed that it wasn't going to skip back out. Which brings up the question: What would happen if it did skip off the atmosphere? Does it go into some odd orbit around Earth, or does it go clean out of orbit and into solar orbit? Pat Pat |
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Did Apollo do a burn prior to re-entry?
On Mar 4, 6:28 pm, Pat Flannery wrote:
Henry Spencer wrote: Nothing "crash" or "square" about it -- a carefully-controlled entry at a very shallow angle, using body lift to shape the path and hold the capsule down in the atmosphere until it had lost enough speed that it wasn't going to skip back out. Which brings up the question: What would happen if it did skip off the atmosphere? Does it go into some odd orbit around Earth, or does it go clean out of orbit and into solar orbit? Pat Pat Pat, At the risk of sounding like a smart aleck, I think the answer is yes . . . or perhaps more accurately, it depends. It probably depends on the angle at which the reentry had been attempted, vechicle velocity, and the weight of the vehicle, which increased as more and more samples were brought back. I suspect that it would be a funny- shaped earth orbit, but maybe someone more proficient at orbital mechanics can tell us for sure. Take care . . . John |
#9
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Did Apollo do a burn prior to re-entry?
John wrote: Pat, At the risk of sounding like a smart aleck, I think the answer is yes . . . or perhaps more accurately, it depends. It probably depends on the angle at which the reentry had been attempted, vechicle velocity, and the weight of the vehicle, which increased as more and more samples were brought back. I suspect that it would be a funny- shaped earth orbit, but maybe someone more proficient at orbital mechanics can tell us for sure. Take care . . . John I can picture it losing enough velocity that it travels outbound from the Earth to a very high altitude, stops, and then falls straight into the atmosphere and burns up. Pat |
#10
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Did Apollo do a burn prior to re-entry?
In article ,
Pat Flannery wrote: ...using body lift to shape the path and hold the capsule down in the atmosphere until it had lost enough speed that it wasn't going to skip back out. Which brings up the question: What would happen if it did skip off the atmosphere? Does it go into some odd orbit around Earth, or does it go clean out of orbit and into solar orbit? Yes. :-) If I recall correctly, under the right/wrong conditions, it was barely possible for a very shallow skip to end up in solar orbit. Orbits with apogee near the Moon are not that strongly bound to Earth, and can end up escaping when the three-body dynamics work out just so. Far more likely, though, given that there would be *some* loss of energy even in a skip, was a high elliptical orbit around Earth. Typically this would encounter the atmosphere again, but long after the CM's consumables were exhausted, so the difference wasn't too significant to the crew. :-) -- spsystems.net is temporarily off the air; | Henry Spencer mail to henry at zoo.utoronto.ca instead. | |
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