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Search for snoopy
In sci.space.history Jeff Findley wrote:
In article , Did SMART-1 get through the belts comparatively quickly compared to what ISS would, or was it specially hardened, or both? In other words, it was already above the worst of the inner belt. Furthermore, due to the highly elliptical orbit, very little time was spent at lower altitudes. So, it got through quickly Here is a cool orbit animation. Crank up the eccentricity to 0.77 (initial orbit eccentricity of SMART-1) and you'll see how little time is spent at the lower altitudes in an orbit this eccentric. van-Allen belts (the inner belt is "the worst" of the two in terms of radiation): http://en.wikipedia.org/wiki/Van_Allen_radiation_belt I might be dense and missed where in the wikipedia article the simululation was, or is there a missing link? rick -- denial, anger, bargaining, depression, acceptance, rebirth... where do you want to be today? these opinions are mine, all mine; HP might not want them anyway... feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... |
#53
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nasa may have been concerned a space tug could hurt contractors somhow
and saved money. plus a new model space tug would likely be more efficent. there are lots of reasons one was never built |
#54
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In article 7751f3da-1cc9-48fc-8b10-
, says... nasa may have been concerned a space tug could hurt contractors somhow and saved money. plus a new model space tug would likely be more efficent. there are lots of reasons one was never built There was never any conspiracy. There was just no money for on OTV. The shuttle program (followed by Freedom/ISS) gobbled up nearly the entire NASA manned space budget. 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 |
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On Oct 5, 8:38*am, Jeff Findley wrote:
In article 7751f3da-1cc9-48fc-8b10- , says... nasa may have been concerned a space tug could hurt contractors somhow and saved money. plus a new model space tug would likely be more efficent. there are lots of reasons one was never built There was never any conspiracy. *There was just no money for on OTV. * The shuttle program (followed by Freedom/ISS) gobbled up nearly the entire NASA manned space budget. 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 the tug proposal goes back to skylab, it was suggested to boost skylabs orbit, to use it some way for future operations |
#56
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Search for snoopy
In article 0ca89545-f94b-4e02-82b2-73e5cc013b01@
18g2000yqz.googlegroups.com, says... On Oct 5, 8:38*am, Jeff Findley wrote: In article 7751f3da-1cc9-48fc-8b10- , says... nasa may have been concerned a space tug could hurt contractors somhow and saved money. plus a new model space tug would likely be more efficent. there are lots of reasons one was never built There was never any conspiracy. *There was just no money for on OTV. * The shuttle program (followed by Freedom/ISS) gobbled up nearly the entire NASA manned space budget. 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 the tug proposal goes back to skylab, it was suggested to boost skylabs orbit, to use it some way for future operations You're confusing different proposals for different vehicles. The Skylab Reboost Module was a cobbled together conglomeration of hardware meant for one use only. It was not a general purpose "space tug". http://www.astronautix.com/flights/sts2a.htm http://www.astronautix.com/craft/skyodule.htm Various "space tug" concepts which were designed for general use have come and gone over the years. OTV (orbital transfer vehicle). http://www.astronautix.com/craft/otv.htm Orbital Maneuvering Vehicle http://www.astronautix.com/craft/omv.htm I've seen similar proposals from around the same time period which aren't documented on the Internet. Somewhere at home, I've got some magazine articles I saved which show a manned OTV which predated the version above. The version I remember did not use aerobraking. A modern version of a space tug "on the cheap" could be a modified Orion service module or ESA's ATV without the pressurized section. Both of these would be similar to the modified Progress propulsion module which the Russians have used to deliver docking/airlock modules to ISS. The problem is, where is the need for such a vehicle? Just what would NASA use it for? MDA is working on a commercial satellite servicing vehicle which might also be useful as a small "tug". If there is a commercial need for such a vehicle, I'd expect companies like MDA to provide such a service. http://www.mdacorporation.com/corpor...iceMission.cfm It's also possible that other commercial companies could provide similar services, if needed. Pretty much any company doing commercial ISS resupply would have the skills needed to build and operate such a vehicle. 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 |
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