|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
On Jul 2, 3:11*am, Fred J. McCall wrote:
Sylvia Else wrote: On 2/07/2012 4:50 PM, Fred J. McCall wrote: Sylvia Else wrote: On 2/07/2012 3:42 PM, Fred J. McCall wrote: Sylvia Else wrote: On 2/07/2012 12:55 AM, Fred J. McCall wrote: Sylvia Else wrote: On 1/07/2012 4:02 PM, Fred J. McCall wrote: Sylvia Else wrote: On 1/07/2012 1:46 AM, Fred J. McCall wrote: bob haller wrote: wonder if a work around is possible to point with just 2 reaction wheels? Oh, good God! *THINK, Bobbert! *You need pointing control in 3 dimensions. *You cannot do that with only two axis control *So no, you cannot 'work around' the laws of physics. If the axes of rotation of the three wheels are orthogonal, and one reaction wheel rotates, it changes the axes of rotation of the other two. Indeed, the axes of the other two can be interchanged. Now hold it steady.... Hint: *You can eventually get it pointed anywhere, but you can't KEEP it there in order to do science. Well, that's going to depend on what science you're trying to do, and on whether the craft has any net angular momentum. If it has no net angular momentum, it should be possible to get it pointed in any direction with minimal drift, which will be good enough for many purposes. And yet the folks who run the thing think it requires at least 3 working reaction wheels to do any science.... These things are rarely back-and-white. And yet the folks responsible for operating the thing think it is. Do they? Have they expressly stated that this is a black and white issue? Yes. *You see, Sylvia, you think you want to argue with me. *I'm telling you you're arguing with the folks who control the thing. You're making certain representations as to what they think. I'm questioning whether they actually think whay you claim they think. So the argument is about what they think, not whether they're right in thinking it. The argument is thus definitely with you, not with them. In that case, feel free to go do something anatomically creative with yourself, since facts straight from the horse's mouth don't matter to you. -- "The reasonable man adapts himself to the world; the unreasonable *man persists in trying to adapt the world to himself. Therefore, *all progress depends on the unreasonable man." * * * * * * * * * * * * * * * * * * * --George Bernard Shaw fred believes he is a expert in everything, and that helps make him the ass he is |
#12
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
|
#13
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
|
#15
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
In article , lid
says... On 2/07/2012 10:54 PM, Jeff Findley wrote: In article e8638c86-98b7-4b40-a3a2-734d0c291939 @v33g2000yqv.googlegroups.com, says... On Jul 2, 3:11 am, Fred J. McCall wrote: Sylvia Else wrote: On 2/07/2012 4:50 PM, Fred J. McCall wrote: Sylvia Else wrote: On 2/07/2012 3:42 PM, Fred J. McCall wrote: Sylvia Else wrote: On 2/07/2012 12:55 AM, Fred J. McCall wrote: Sylvia Else wrote: On 1/07/2012 4:02 PM, Fred J. McCall wrote: Sylvia Else wrote: On 1/07/2012 1:46 AM, Fred J. McCall wrote: bob haller wrote: wonder if a work around is possible to point with just 2 reaction wheels? Oh, good God! THINK, Bobbert! You need pointing control in 3 dimensions. You cannot do that with only two axis control So no, you cannot 'work around' the laws of physics. If the axes of rotation of the three wheels are orthogonal, and one reaction wheel rotates, it changes the axes of rotation of the other two. Indeed, the axes of the other two can be interchanged. Now hold it steady.... Hint: You can eventually get it pointed anywhere, but you can't KEEP it there in order to do science. Well, that's going to depend on what science you're trying to do, and on whether the craft has any net angular momentum. If it has no net angular momentum, it should be possible to get it pointed in any direction with minimal drift, which will be good enough for many purposes. And yet the folks who run the thing think it requires at least 3 working reaction wheels to do any science.... These things are rarely back-and-white. And yet the folks responsible for operating the thing think it is. Do they? Have they expressly stated that this is a black and white issue? Yes. You see, Sylvia, you think you want to argue with me. I'm telling you you're arguing with the folks who control the thing. You're making certain representations as to what they think. I'm questioning whether they actually think whay you claim they think. So the argument is about what they think, not whether they're right in thinking it. The argument is thus definitely with you, not with them. In that case, feel free to go do something anatomically creative with yourself, since facts straight from the horse's mouth don't matter to you. fred believes he is a expert in everything, and that helps make him the ass he is Did you ever stop to think that Fred actually knows people who work on the program? Engineers know other engineers. Looks like you and Sylvia just don't know the same people Fred knows. Oh well. Fred's response indicated that he believes that he is the horses mouth. You are picking a nit with Fred's use of the saying "straight from the horse's mouth". The rest of his posts indicate very clearly that the people working on the actual program say they need 3 working wheels to do science. Here are some interesting reads: Mars Reconnaissance Orbiter Design Approach for High-resolution Surface Imaging http://trs-new.jpl.nasa.gov/dspace/b.../1/03-0246.pdf While the above does not state that three wheels are needed to do science, it gives you quite a bit of information on what the requirements actually are for pointing accuracy. Jeff -- " Ares 1 is a prime example of the fact that NASA just can't get it up anymore... and when they can, it doesn't stay up long. " - tinker |
#16
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
On Jun 28, 11:27*am, Doug Freyburger wrote:
wrote: One of the most amazing photos I've ever seen is from Odyssey. *It shows the parachute of one of the rover missions as it descended through the Martian atmosphere. *The first photograph of a spacecraft at another planet taken by a spacecraft at another planet. You're confusing your spacecraft, Doug Odyssey does not have that kind of resolution, but the Mars Reconnaissance Orbiter (MRO) does and did take that and other high resolution images of various landers on Mars. -Mike |
#17
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
I think everyone should take up a collection to send Fred J Mc Call
one a ONE WAY trip to mars, with no internet access ever....... this would help make this a nicer friendlier place |
#18
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
In article 6396f032-7a72-4a2d-95ba-
, says... I think everyone should take up a collection to send Fred J Mc Call one a ONE WAY trip to mars, with no internet access ever....... this would help make this a nicer friendlier place Perhaps friendlier, but it would be far less knowledgeable. Fred just has a low tolerance for the stupid, irrational, and illogical. Jeff -- " Ares 1 is a prime example of the fact that NASA just can't get it up anymore... and when they can, it doesn't stay up long. " - tinker |
#19
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
On Jul 5, 10:33*am, Jeff Findley wrote:
In article 6396f032-7a72-4a2d-95ba- , says... I think everyone should take up a collection to send Fred J Mc Call one a ONE WAY trip to mars, with no internet access ever....... this would help make this a nicer friendlier place Perhaps friendlier, but it would be far less knowledgeable. *Fred just has a low tolerance for the stupid, irrational, and illogical. Jeff -- " Ares 1 is a prime example of the fact that NASA just can't get it * up anymore... and when they can, it doesn't stay up long. " * *- tinker fred just says everything is impossible, even when proved later its been done or has been attempted. his obnxious is unnecessary and adds nothing here |
#20
|
|||
|
|||
Longest-Lived Mars Orbiter is Back in Service (Mars Odyssey)
On Jul 6, 3:43*am, Fred J. McCall wrote:
bob haller wrote: On Jul 5, 10:33*am, Jeff Findley wrote: In article 6396f032-7a72-4a2d-95ba- , says... I think everyone should take up a collection to send Fred J Mc Call one a ONE WAY trip to mars, with no internet access ever....... this would help make this a nicer friendlier place Perhaps friendlier, but it would be far less knowledgeable. *Fred just has a low tolerance for the stupid, irrational, and illogical. fred just says everything is impossible, ... Bobbert only ever lies. ... even when proved later its been done or has been attempted. And then lies some more. his obnxious is unnecessary and adds nothing here Anything is better than the negative that the DNR brain-dead ilk like you and Guthball 'add'. -- "Ordinarily he is insane. But he has lucid moments when he is *only stupid." * * * * * * * * * * * * * * -- Heinrich Heine fred you never support any concept posted here by anyone but yourself....... |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Seventh attempt by NASA's Mars Odyssey orbiter to communicate withBeagle fails (Forwarded) | Andrew Yee | Astronomy Misc | 0 | December 31st 03 02:14 AM |
JAXA gave up injecting Mars Orbiter "Nozomi" into orbit of Mars (Forwarded) | JimO | Policy | 1 | December 10th 03 03:46 PM |
JAXA gave up injecting Mars Orbiter "Nozomi" into orbit of Mars (Forwarded) | Andrew Yee | Astronomy Misc | 0 | December 10th 03 04:58 AM |
The Odyssey Orbiter Continues to Share the Adventure of Mars Exploration | Ron Baalke | Science | 0 | October 3rd 03 07:43 PM |