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More Cautionary Words I'm apparently in good company in my concerns about the administration's new space policy. ...a sustained human presence on the moon, advocates say, is best achieved by harnessing the full creativity of the commercial sector. We'll find out Wednesday, if Keith is right. Or perhaps not. Even if the president makes a formal address, it would still be possible to do so without getting into the implementation details (though I would argue that this is an argument of philosophy and purpose, as much as implementation, and certainly should be specifically addressed in such a policy announcement). Posted by Rand Simberg at January 12, 2004 11:35 AMTrackBack URL for this entry:
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If the concepts of "settlement", "general public", "development of space", "new frontier" wont outweigh "exploration, science and inspiration" in the formal statement, its a dead cause. Posted by at January 12, 2004 12:29 PMHmmm... Rand, would you feel more enthusiastic about this if the Administration announced it would buy all launch services from commercial vendors? I just looked at the annual transportation requirements of some previous NASA lunar architectures: * 1969-72: Apollo (two Saturn V launches per year on average, transporting about 250 metric tons/year to LEO) * 1969 Space Task Group: about 770-1100t of propellant & supplies for supporting 6 astronauts on the lunar surface and 6 in lunar orbit. This plan would have required 34-48 annual space shuttle missions. * 1984 NASA "Lunar Bases and Space Activites of the 21st Century" plan: ~630t/year supporting 18 astronauts on the Moon as well as in lunar orbit. * 1989 Space Exploration Initiative "90-day" study: six Shuttle-C launches (=~400t) supporting a crew of eight. This total will rise to 1000t/year once manned missions to Mars begin. * 1992 "First Lunar Outpost": 250-500t per year (=1-2 uprated Saturn V launches) * 1993 "LUNOX" by Kent Joosten & Lisa Guerra: 2-3(?) Shuttle-C missions per year or 160-240t. * 1995 "Human Lunar Return": 4-8 Proton, Ariane or Titan IV-class launches (80-160t) Granted -- some of these architectures would require a heavy-lift launch vehicle. But it seems the least costly option, in terms of DDT&E, would try to utilize existing launchers such as the EELV and Ariane-5. This, in turn, would require a "spacedock" refueling node in low Earth orbit as well as partially or fully reusable space/lunar transfer vehicles. Even the 1992 FLO plan could be compatible with this, with some modifications. Note, in passing, that there is much more to the problem than LEO transportation costs though. The manned lunar landers listed here typically cost $0.5-1 billion per copy! CATS *alone* will not solve all our problems. Truly affordable lunar exploration won't happen until we have cheap and fully reusable RLVs *and* deep space transfer vehicles as well as propellant production/storage facilities on several places in the Earth-Moon system. This is not going to be easy, consequently I feel it would be a mistake to focus all efforts on some low-cost RLV. Far better to attack the problem from several directions MARCU$ Posted by Marcus Lindroos at January 12, 2004 12:40 PM...would you feel more enthusiastic about this if the Administration announced it would buy all launch services from commercial vendors? Possibly. It depends on how the procurement occurs. I'd feel a lot better about it if they demanded lower prices than were possible from Atlas or Delta, and precluded foreign vendors (not because I necessarily want them to buy America First, but because I don't want cut-rate subsidized launchers from the second world to prevent the development of true low-cost systems). There would be no point if it simply continued to fund business as usual (aka Delta/Atlas). As for the high cost of lunar landers, that is a strong function of the high cost of launch. I don't buy any cost estimate based on current paradigms. Posted by Rand Simberg at January 12, 2004 01:36 PMLo and behold, theres a new UPI article. For the Grand Plan, Bush will go seek help from foreign partners. > Possibly. It depends on how the procurement
The U.S. launched about 200-400t/year into LEO during the 1970s, 80s & 90s. A manned lunar exploration program would boost this total by a factor of two or more, depending on the scope of the effort. And the manned spaceflight-related payloads will get funded anyway, due to bureaucratic inertia, porkbarrel politics and nostalgia. If this activity were separated from the LEO transportation business while preserving compatibility with commercial rockets, it could serve as a powerful market driver.
But the 1969 cost estimates were based on the assumption that the Shuttle would reduce launch costs to $250-$600/kg (1999 rates). That's almost as low as the expected cost of a "mature" space tourism vehicle such as Kankoh Maru ($20,000/ticket). Yet I notice the NERVA tugs would have cost more than $150 million per copy. True -- these estimates were somewhat lower than for today's equivalent NASA plans but the difference isn't *that* great.
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