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#31
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jeff findley wrote in message ...
(ed kyle) writes: ... At four launches per year, each launch, capable of putting roughly three EELV-Heavy equivalents (75 metric tons) in LEO, would cost roughly $533 million - probably putting it below the recently increased price point per kg of EELV-Heavy. This assumes you launch 4 SDV's every year. If you don't, all you really save is the cost of an ET and the cost of two reloaded SRB's. All other costs remain whether you launch 4 times or zero. Per-launch costs are widely variable when figured on a per-year average basis. A longer-term view is needed. The same is pretty much true of the EELV programs. Right now, the EELV effort is reportedly budgeted at about for around $670 million per year (total for both EELVs), this to keep the factories and launch sites open. Only three or four EELV launches will happen this year, making the average cost for each launch either $167 or $223 million. But over the longer run, $4 billion is budgeted for 29 planned launches through about 2009, making an average of $137 million for each mission. Costwise, EELV and SDV appear to work out to be roughly in the same ballpark, at least for basic launch cost. An SDV could prevail, however, when it comes to mission practicality and reduced mission integration costs. And yes, I think NASA would find missions for an average of four SDVs per year if a lunar program was pursued. After all, the agency found reasons to launch six or more shuttles in most years, even before there was a place (ISS) for shuttle to go. - Ed Kyle |
#32
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"Scott Lowther" Had it been a *real* space station, without the State Department mucking it up with extraneous Russian crap, it'd be much better. In order to be a real space station, it would require a real transfer vehicle. The STS was supposed to launch weekly at about $50 million per trip. The Russian "crap", now otherwise known as the Kliper, comes a lot closer in concept to being able to do this. But then they have no exclusive franchise. England, Germany, Japan, and even the US could come up with an improved design now that the STS has pointed the way. It is tempting to buy in to the argument that competition is the way to get to Mars, and that we would not have gotten to the Moon unless the Russans were trying to do the same thing. On the basic level of putting the project in motion, this was certainly true. But I somehow doubt that von Braun and others were thinking "we need to beat the Russians" as much as "wow, let's try to land on the Moon." I would agree that the ISS is not necessarily improved by the contributions of Russia compared to what the US could have achieved by expending the same funds on its own in-house projects. But the Russians came in late in the process. And they were operating under a Socialist economy, and worse a corrupt economy. I think it is possible that with the right kind of coordination that a Mars mission could achieve a net gain by involving the participation of extra-national entities. I also believe that the US could do it without outside participation. And I believe that there is a distinct chance that economic factors involving energy supplies, demographics, etc., may impact the financial ability of the US to achieve a Mars landing. [If we have to pay $10 a gallon for gas, and there is one retiree for each employee, it may be a challenge just to keep the lights on.] |
#33
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"Scott Lowther" wrote in message ... Reliance on other nations, especially those that are rife with anti-Americanism and corruption, is a seriously bad idea. Were it not for reliance on other nations, there would be e.g. no Apollo, no Gemini, no Mercury, and no STS. Not all of the tracking stations and emergency landing strips can be in the USA. The USA itself is about as 'rife with anti-Americanism and corruption' as any other country. |
#34
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"Kent Betts" wrote in message ... It is tempting to buy in to the argument that competition is the way to get to Mars, and that we would not have gotten to the Moon unless the Russans were trying to do the same thing. On the basic level of putting the project in motion, this was certainly true. But I somehow doubt that von Braun and others were thinking "we need to beat the Russians" as much as "wow, let's try to land on the Moon." I tend to think that if JFK had lived, people would have lost interest and the deadline would not have been met. |
#35
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It also makes flying the shuttle more risky. There are many emergency procedures on the shuttle that require people on-board. Not the least of which is the contingency EVA for closing the payload bay doors (if they don't close automatically). Jeff In the case of anything that needs done before reentry just leave the vehicle in orbit till a manned crew can do a repair mission. We might loose a vehicle because no one onboard but no one dies, a definite positive. I just wonder what changes might be made to the remaining shuttles to keep them operating for specific jobs in a unmanned mode. Specifically if shuttle C became a reality. |
#36
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Brian Thorn writes:
On 01 Mar 2004 17:16:37 -0500, jeff findley wrote: Miss one luanch in a year, and your per launch cost goes up significantly. Miss three launches, and your per luanch cost (for that single launch) is likely to be in the $2 billion range. Miss all four luanches, and your "per launch cost" for the year isn't even defined. By the same token, launch six SDVs (say, four lunar flights, JIMO, and a Pentagon NMD payload) and the costs come down further. You need to average costs over more than a year. Agreed. I'd also include those years between shutting down the shuttle program and the first launch of the new SDV. Enough of those years and you start negating the cost "benefit" of using SDV in the first place. The point has been made that new EELV facilities will need to be built if there isn't an SDV. While this is true, if you time it correctly, you won't build those facilities until you've firmed up when you need them. In the mean time, EELV would continue to fly with existing facilities, which would increase our experience with the vehicles and hopefully find lingering problems before NASA would need them for manned flights. Jeff -- Remove "no" and "spam" from email address to reply. If it says "This is not spam!", it's surely a lie. |
#37
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#38
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"Kent Betts" wrote in message
... There is no product. There is no profit. So, in your opinion, there is no reason for going back to the Moon? The only practical reason for sending people is profit - profit cannot, with current or projected technology, be 'made' without people for maintenance and operations. Machines are too intricate to maintain adequately with other machines; if that were possible, there would be no aircraft or car mechanics. -- Alan Erskine We can get people to the Moon in five years, not the fifteen GWB proposes. Give NASA a real challenge |
#39
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"Derek Lyons" wrote in message
... "Alan Erskine" wrote: The problem is that once again (at least with this sketchy outline) is that once again we find 'and then magic occurs' when it comes to industrialization. I'd like to see the original document and see if it actually addresses this issue. D. -- Touch-twice life. Eat. Drink. Laugh. Do I remove "nospam" from your email addy? -- Alan Erskine We can get people to the Moon in five years, not the fifteen GWB proposes. Give NASA a real challenge |
#40
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y be possible for some failures, but the failure of the payload
bay doors to close is a sticky issue. The best way to fix this is to have someone in an EMU, in the payload bay, crank the doors closed. Now you've got someone in an EMU you have to get dow Ahh he enters the old crew cabin and leaves out the airlock to his docked or nearby vehicle. No reason for him to remain in the shuttle for landing. Not so. We've only got three vehicles left. Planning on flying them unmanned increases the risk you'll lose one. You believe that losing an orbiter will end the program. I believe that if this is the case, it won't make a difference if the shuttle is unmanned. The program will end due to lack of available orbiters to fly the required missions. I just wonder what changes might be made to the remaining shuttles to keep them operating for specific jobs in a unmanned mode. Specifically if shuttle C became a reality. If Shuttle C becomes reality, there isn't much of a reason to ever fly a shuttle again. It's upmass would be far less than Shuttle C, and there isn't a real requirement for downmanss, outside of returning lunar/martain samples and astronauts. Shuttle C (or any other SDV) means the orbiters would go to museums. The biggest reason you must retire the orbiters is to free up funds to fly the SDV. NASA can't have its cake and eat it too. Jeff -- Loosing a unmanned orbiter wouldnt end the program. Its that sticky issue of human death that can end it. You believe having it manned increases its safety margins. Just how many times did having a pilot at the controls save a orbiter? Telepresence with the pilot safe on the ground and triple redundant remote controls could likely accomplish the same thing. |
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