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Post by JayUtah on Mar 5, 2010 17:08:27 GMT -4
Incredulity and doubt ?, i haven`t heard a single comment that was anything other than that including void of any facts in relation to the comment or question. Have you studied orbital mechanics, as in having taken a class where a test was given? Have you operated spacecraft in orbits before?
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Post by tedward on Mar 5, 2010 17:08:43 GMT -4
Opps. posted at the same time.
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Post by drewid on Mar 5, 2010 17:10:57 GMT -4
There were two mainframes on the Earth doing orbital calculations which were then transmitted to the craft, the onboard machine didn't have to handle that stuff.
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Post by blackbriar1 on Mar 5, 2010 17:15:38 GMT -4
Is it a fair comparison between the Gemini and what it consisted of and the lunar module and what it`s on board fuel supply was? Apples and Oranges.
How much more fuel work was it for that to reach it`s proper orbit and catch up with the service module, the LEM itself barley had enough fuel to "Just" drop into gravity and land let alone enough to thrust out of it and leave it returning to orbit, you know orbit where`s there is still some gravitational pull ?
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Post by blackbriar1 on Mar 5, 2010 17:17:25 GMT -4
Have you studied orbital mechanics, as in having taken a class where a test was given? Have you operated spacecraft in orbits before?
Have you JayUtah???
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Post by carpediem on Mar 5, 2010 17:18:44 GMT -4
OH! Yea, who did the spacewalk and go out to the leg of the LEM after it was docked onto the service module and retrieve the film out of the camera? You know the film roll that didn`t get damaged or melted from hydrazine burn nozzle, those low angle pictures with the leg mounted camera that recorded mankind's first step onto the moon without anyone else there taking the picture or moon dust on the lens? If i remember that first prototype picture of the testing LEM on the earths surface, weren`t the leg footprints much further apart than the actual LEM`s to avoid the heat of the rockets main thrust nozzle? Not sure how that leg mounted Hasslblad took all that close proximity heat and survived? The LEM got dumped in space before coming home, so someone had to do a spacewalk to get the film or even if it was some kind of link video camera, did they have a small tv station on board? And again with the moon dust on the lens? What did they have? A remote controlled dust proof pop off lens cover to record the event? All mystifying.......chain of perfect events..... The DAC film camera was mounted inside one of the windows of the LM on landing/takeoff so no retrieving of the film was necessary. Some details about the video camera are here: en.wikipedia.org/wiki/Apollo_TV_cameraNeedless to say it was mounted far above the engine and IIRC Armstrong had to pull on a lanyard to deploy it initially so it's impossible for there to be a problem with moon dust.
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Post by blackbriar1 on Mar 5, 2010 17:27:38 GMT -4
There were two mainframes on the Earth doing orbital calculations which were then transmitted to the craft, the onboard machine didn't have to handle that stuff.
"didn't have to handle that stuff." Get out RandomBloakes Seth Thomas and the yardstick and plumb bob............
I thought they taught elementary reading back in the 1st grade.
Where did and how did they know precisely where the LEM was located on the surface of the MOON so that their highly advanced computer systems could calculate a safe intersect in orbit without mishap or calamity ? [two powerful mainframes on earth... my HP-48gx has more nuts than that]
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Post by JayUtah on Mar 5, 2010 17:30:57 GMT -4
Yes. Now please tell us whether you have.
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Post by JayUtah on Mar 5, 2010 17:32:29 GMT -4
There were two mainframes on the Earth doing orbital calculations which were then transmitted to the craft, the onboard machine didn't have to handle that stuff. For much of the navigation, rough partial solutions were precomputed using LLNL's CDC 6600 supercomputer. These partial solutions could be fed into the IBM System/360 computers at the RTCC to be refined into high-precision solutions.
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Post by drewid on Mar 5, 2010 17:36:24 GMT -4
Where did and how did they know precisely where the LEM was located on the surface of the MOON so that their highly advanced computer systems could calculate a safe intersect in orbit without mishap or calamity ? Because they knew how far they had overshot from their original projected landing site, and in which direction. It's very simple really.
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Post by JayUtah on Mar 5, 2010 17:37:59 GMT -4
Where did and how did they know precisely where the LEM was located on the surface of the MOON...What precision do you think was required? On Apollos 12 through 17 the LM was visually observed on the lunar surface from the orbiting CSM. For Apollo 11 the position was estimated based on the intended landing site and Armstrong's last-minute manual flight. ...a safe intersect in orbit without mishap or calamity ?What exactly would have been unsafe about an imprecise orbit? What exact calamity would have arisen? The Apollo lunar ascent was based on the likelihood that the LM would not achieve the intended orbit precisely. Hence it was understood that some correction would be needed. There were even techniques for doing this using only line-of-sight observations. If you want to know more, Dr. Aldrin's doctoral dissertation on the subject is available from MIT. A derivative of that same technique is used for unmanned supply craft rendezvouses with the ISS. two powerful mainframes on earth... my HP-48gx has more nuts than thatI'm sure it does, but do you have any evidence that the computers actually used for Apollo were unequal to the tasks to which they were put?
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Post by PhantomWolf on Mar 5, 2010 17:38:10 GMT -4
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Post by blackbriar1 on Mar 5, 2010 17:43:05 GMT -4
"rough partial solutions were precomputed "
What on earth is that going to do for someone sitting in a tiny boat out in the middle of the sea...so to speak, when they had theirselves a time getting the LEM down onto the moon surface, HOW in major capitals letters did they know their exact position in present time, not fifty days ago of super computing and projecting high-precision solutions? Inclusive to the precise orbit of the service module....again in present real time not in high-precision solutions time?
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Post by laurel on Mar 5, 2010 17:47:06 GMT -4
I thought they taught elementary reading back in the 1st grade. You'll get a better reception on this board if you try being civil.
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Post by JayUtah on Mar 5, 2010 17:49:01 GMT -4
What on earth is that going to do for someone sitting in a tiny boat out in the middle of the sea...It's going to provide a set of precomputed partial solutions that can be refined quickly in the RTCC to determine orbital mechanics solutions. The position of the CSM/LM can be determined by Doppler-informed radio observations, and reckoned by the onboard computer via dead reckoning. I'll ask again: do you have any formal, adjudicated training in orbital mechanics or spacecraft flight dynamics? Please answer.
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