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#41
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artificial gravity a different idea...maybe?
Christopher wrote:
For healthy space exploration and habitation you need 1 g environments. There's plenty of evidence that 1 g is sufficient (assuming a normal healthy life style, not confined to bed), and 0 g is not sufficient. Between 0 and 1 g, there's no data. Except for a few man-days on the moon, there's virtually no experience of living in partial g. Probably, something less than 1 g would suffice, especially if coupled with appropriate exercises and other countermeasures to deconditioning. But nobody really knows. Billions of dollars have been spent on microgravity life science, looking for such countermeasures, with very limited success. I wish some portion of that budget would be invested in a real space-based artificial-gravity test bed. -- Ted Hall |
#42
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artificial gravity a different idea...maybe?
free fall basket ball
"Johnson.." wrote: Hi Folks Just joined the group for the purposes of posting an idea. I have been doing a little reading today about artificial gravity and haven't seen magnetism mentioned at all. This may sound stupid but couldn't the floor of a spacecraft be magnetized and the crew wear suits that would be attracted to that floor? It would be more practical in a spacestation, which runs on photovoltaic, cause the electro magnetic floor would be a drain on electricity. Please let me know what you think. |
#43
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artificial gravity a different idea...maybe?
Gordon D. Pusch wrote: Possibly the little detail that the "cylindrical surface" needs to be about a =MILE= in diameter to get the rotation rate down below 1 rpm @ 1 gee, since if it rotates faster than 1 rpm, the majority of human beings tested upchuck. (Even at 1rpm, a significant fraction of the people tested upchuck; you need to get the rotation rate down to about 0.25 rpm in order for the general population to not upchuck.) How much up can an upchuck chuck when an upchuck does chuck up? Enquiring minds want to know. -- Gordon D. Pusch RRS |
#44
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artificial gravity a different idea...maybe?
Roger Stokes wrote:
"Theodore W. Hall" wrote in message ... I wish some portion of that budget would be invested in a real space-based artificial-gravity test bed. Has it been formally proposed to NASA and turned down, or not proposed at all? Sure, lots of people have proposed lots of things to NASA, but NASA doesn't set its own budget or goals. It's at the mercy of Congress and the Administration. Politicians are prone to proclamations about space policy and goals without understanding anything of the technical issues. They won't propose anything that specific, nor understand it if it's proposed to them. NASA and its contractors have done lots of paper studies artificial gravity, but none of them have gotten past ground-based centrifuge experiments and conceptual design of space hardware. Artificial gravity has not been part of any funded mission. Here are some technical / historical references: Kramer, Saunders B.; Byers, Richard A. (Lockheed Aircraft Corporation) (1960). "A Modular Concept for a Multi-Manned Space Station." _Proceedings of the Manned Space Stations Symposium, April 20-22, 1960_, p. 36-72. Institute of the Aeronautical Sciences. Hill, Paul R.; Schnitzer, Emanuel (NASA Langley) (1962). "Rotating Manned Space Stations." _Astronautics_, vol. 7, no. 9, p. 14-18, September 1962. American Rocket Society. Berglund, Rene A. (NASA Langley) (1962). "AEMT Space-Station Design." _Astronautics_, vol. 7, no. 9, p. 19-24, September 1962. American Rocket Society. Kurzhals, Peter R.; Adams, James J. (NASA Langley) (1962). "Dynamics and Stabilization of the Rotating Space Station." _Astronautics_, vol. 7, no. 9, p. 25-29, September 1962. American Rocket Society. Normyle, William J. (1969). "NASA Aims at 100-Man Station." _Aviation Week and Space Technology_, vol. 90, no. 8, p. 16-17, February 24, 1969. McGraw-Hill. NASA Office of Manned Space Flight (Advanced Manned Missions) (1970). "Artificial Gravity Experiment Definition Study." Schultz, David N.; Rupp, Charles C.; Hajos, Gregory A.; Butler, John M. (1989). "A Manned Mars Artificial Gravity Vehicle" (AAS 87-203). _The Case For Mars III: Strategies for Exploration - General Interest and Overview_, p. 325-352. Edited by Carol Stoker. American Astronautical Society. Staehle, Robert L. (1989). "Earth Orbital Preparations for Mars Expeditions" (AAS 87-205). _The Case For Mars III: Strategies for Exploration - General Interest and Overview, p. 373-396. Edited by Carol Stoker. American Astronautical Society. Lemke, L. G.; Welch, R. B. (eds.) (1988). "Workshop on the Role of Life Science in the Variable Gravity Research Facility." NASA Ames Research Center, March 27-30, 1988. Lemke, L. G. (1988). "VGRF Technology Overview and Strawman Design." NASA Ames Research Center, March 27, 1988. von Puttkamer, Jesco (1985). "The Long-Range Future." _Space Stations and Space Platforms - Concepts, Design, Infrastructure, and Uses_, p. 355-384. Edited by Ivan Bekey and Daniel Herman. American Institute of Aeronautics and Astronautics. I would argue that an artificial-gravity test bed would have been a better use of the life science money spent on ISS. I would argue that an artificial-gravity test bed should be a prelude to a crewed mission to Mars. But I suppose that discussion belongs in news:sci.space.policy -- Ted Hall |
#45
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artificial gravity a different idea...maybe?
JamesStep wrote:
... I remember reading years ago that NASA experimented with magnetic and/or velcro footwear in Skylab (or perhaps it was on the "vomit comet" aircraft) and found that while it sounds good in theory, it just didn't work very well. The "floor" in Skylab was a sort of triangular grid, and the astronauts had shoes designed to lock into it. It was a nice try, considering there was no prior experience with weightless living in such a large volume or for such a long duration. As you say, it sounded like a good idea at the time, but in the end it didn't work very well. It was difficult for the astronauts to lock into the grid with no weight to hold them down. As soon as they pressed against the grid, they would inadvertently shove off. They gave up on the fancy footwear; they learned to work without it. -- Ted Hall |
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