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#11
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"bob haller" wrote in message ... my comments were that with a target as big as the pacific in a realitvely lightweight vehicle with no heat shielding.. little but structural parts probably survive reentry. Totally ignoring that an uncontrollable Progress is likely to hit ISS before it even gets a chance to perform the de-orbit burn. If the CG is out of limits, you're screwed. Jeff -- Remove icky phrase from email address to get a valid address. |
#12
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Sorry, but you fail Spacecraft Attitude Dynamics and Orbital Mechanics (both
500 level courses I took at Purdue many years ago). The prof used to work for JPL and her classes were likely the hardest I took at Purdue (B.S. in Aerospace Engineering). If you can't control the spacecraft due to the CG being way off (i.e. the attitude control system is simply unable to cope), your chances of backing Progress away from ISS safely diminish. Here's an early example. Weld a 100 foot beam horizontally on helicopter (one end attached to the landing gear, the other placed 100 feet to the right side) and put a sizable weight at the end of the beam. Even if the weight of this contraption is within the helicopter's lifting limits, you've surely exceeded the CG limits. There is no way you could safely take off, you'd flip over on your right side and not only destroy the helicopter, but would destroy anything else on the ground that's nearby. Essentially, that's what could happen with a Progress if the CG is out of limits. It could flip end over end and hit ISS. Jeff -- Thanks thats a great explnation and I greatly appreciate it. obviously it must be done carefully..... I stand corrected HAVE A GREAT DAY! |
#13
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#14
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has anyone studied what survives specifically a progress de orbit? How would they? By definition the re-entry path is engineered to drop all leftovers into the ocean. -Mark Martin thats true but certinally given its planned bath, deorbit speed etc, and the mass of the vehicle and contents it must be possible to say..... these paper products have no chance or survival while these gimbal bolts probably will? I assume the path is designed to drop the stuff in the center of the ocean while burning up as much as possible? did they ever recover skylabs film safe? it was predicted to survive. heavy lead lined etc etc.... HAVE A GREAT DAY! |
#15
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#16
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"Mark Martin" wrote in message om... (bob haller) wrote in message ... has anyone studied what survives specifically a progress de orbit? How would they? By definition the re-entry path is engineered to drop all leftovers into the ocean. While this is true, I wouldn't be surprised if the Russians (initially Soviets) didn't use radar to track at least the first few Progress vessels as they destructively re-entered. A tracking ship or two could have done this, at least to help characterize the size and speed of the pieces as they fell into the ocean. You'd surely have to ask the Russians, and they may not want to talk about the details. Jeff -- Remove icky phrase from email address to get a valid address. |
#17
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"Jeff Findley" wrote in message . ..
How would they? By definition the re-entry path is engineered to drop all leftovers into the ocean. While this is true, I wouldn't be surprised if the Russians (initially Soviets) didn't use radar to track at least the first few Progress vessels as they destructively re-entered. A tracking ship or two could have done this, at least to help characterize the size and speed of the pieces as they fell into the ocean. Yeah, you're probably right about that. For that matter, it wouldn't surprise me if U.S. intelligence did the same to a lesser degree. Classified trash. -Mark Martin |
#18
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Mark Martin wrote:
(bob haller) wrote in message ... has anyone studied what survives specifically a progress de orbit? How would they? By definition the re-entry path is engineered to drop all leftovers into the ocean. -Mark Martin Damn, maybe we should get Bob in a boat at the drop zone. He can take us some notes. Sam |
#19
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Damn, maybe we should get Bob in a boat at the drop zone. He can take us some notes. Sam hey russia must know roughly what survives intact. At the time of the Mir deorbit it was stated the following are expected to survive, and a list. has anyone gone looking for Mir remants? HAVE A GREAT DAY! |
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