|
|
Thread Tools | Display Modes |
#41
|
|||
|
|||
NASA Studying Russian 12-month Plan
No, no, no! Again, if there are real microgravity related medical issues that would prevent a Mars flight, you've got to make changes to your "mars transit vehicle" design to accommodate this. One thing that could be done is to spin the craft (manned part on one end attached to the transfer stage by very long cables). The issue here is how much "gravity" is necessary? Can you get by with 1/6 G (moon), or do you need more? Do you need 1/2 G? If you need to provide a full 1 G, this makes the mass of the structure, cables and the fuel needed to spin and de-spin the craft higher. We really *need* to find out what the *real* medical effects are for Mars duration flights and we need to know a.s.a.p. These effects will directly drive the design of your "mars transit vehicle". If NASA is serious about going to Mars, they really need to get moving and start investigating these issues now, not after Mars hardware is designed and built. If they "discover" these issues after the hardware is built, a Mars mission may not be possible without throwing out the hardware and starting the design process over. They could automatuically add in a audio time delay and have no windows looking at earth. You can do this with isolation simulations on the ground. NASA already has some data on this. You don't need microgravity to simulate these effects. It would be pretty cheap to recruit people to spend a couple of years in a double wide trailer without windows. Set them up with computers and communications with the appropriate time delay. Give them the same exercise equipment and the same food you plan to use on your Mars mission, all to examine the *psychological* effects. Unfortunately, the physiological effects can only be studied in microgravity. Whatever the vehicle it shouldnt be so loud to do permanent hearing damage As far as noise goes, blame NASA and Russia for the current ISS design. As I recall, JimO and separately NASA Watch both covered the noise issue early on in the ISS program. The noise kept exceeding the requirements, and NASA kept writing waivers (it's that "can do" attitude to write waivers that we all know and love). If you do a web search, I'm sure you'll find the articles. Try looking for for Zarya and noise. Jeff ISS was not designed for long term stays. with it too noisey, prone to breakdown and requiring way too much maiuntenance. What we need for mars, which presently is what 20- or 30 years out is a interim testbed design. A prototype mars transit craft that would mimick all parts iof a long duration flight. leaving earth it might fly a spiraling flight to a asteroid, with the windopw to earth closed, a increasing time delay built in, and other things to mimick such a flight in a near earth environment. I find the what gravity do we need to keep the crew safe argument funny. When the discussion of a moonbase came up this group thought it unnecessary. While the moons gravity long term study would be a excellent test for equiptement and personell. Your set to solve the mars human health factor while we cant even get out of LEO : : : My opinion is right |
#42
|
|||
|
|||
NASA Studying Russian 12-month Plan
You're such a twit. Who cares what the press thinks! Tell them the truth. NASA is preparing for the missions that will be available and the astronauts who were let go simply refuse to go on those missions because they thought they were signing up for two week long Next mars trip is what 30 years from now? 20? existing astronauts wopuldnt be going anywhere far, and its doubtful those recruited today will either But the AMERICAN PUBLIC pays the bills, ignore public opinion is a good way to destroy manned space : : : My opinion is right |
#44
|
|||
|
|||
NASA Studying Russian 12-month Plan
|
#45
|
|||
|
|||
NASA Studying Russian 12-month Plan
|
#46
|
|||
|
|||
NASA Studying Russian 12-month Plan
A lot of people have been talking about how bone demineralization could
be such a serious problem on long missions that we may have to generate some form of artificial gravity. But no one knows how much G is necessary to slow or stop demineralization. Well, here's a thought -- wouldn't that be one of the very good reasons for having a lunar base for five years or so before we try a Mars expedition? Putting people on the Moon for periods of a year or more would let us determine whether or not 1/6G is sufficient to stop bone demineralization. If it's not, then we'll have to design spin-up systems that provide more than 1/6G. If it is, then we'll know for sure that 1/6G will suffice for long expeditions. The other option, as I see it, is to design, build and fly in LEO a spacecraft that has various "levels" of inertia-generated gravity. Have some crew spend all their time in the microgravity section, have some crew spend all their time in the 1/20G section, and so on, up to a 1/4G or 1/2G section. You'd have to be really rigorous in keeping people to their own sections (which could be terribly hard on a crew if your crew size is small), but you'd get the data you need. And here's another thought: if you don't want to use highly trained astronauts and cosmonauts as medical guinea pigs for such long-duration studies, why not ask for volunteers? Hell, I'd be HAPPY to spend a year or two away from my spouse if it means I could spend it in orbit. Just give me an internet connection and I'll be just fine. I bet there would be hundreds of thousands of people who would volunteer for such "guinea pig" missions. Doug |
#47
|
|||
|
|||
NASA Studying Russian 12-month Plan
|
#48
|
|||
|
|||
NASA Studying Russian 12-month Plan
Doug... writes:
The brittle bones issue may have to be addressed with some type of inertia-based artificial gravity system for Mars flights and asteroid exploration/exploitation missions. I don't know that there are *any* astronauts who are willing to become invalids in the name of science, and I don't know that it's fair -- at any level -- to ask that of anyone. As of now, NASA claims that this is an unknown. The only way to find out is to do the research. We seem to be lacking the balls that the early NASA astronauts had. Everything was unknown at that time and the astronauts flew the first flights knowing that they were guinea pigs. Look at the Skylab fights. Those guys faced the very same dilemma of pushing the envelope of human endurance in microgravity. If we've lost that determination to push the envelope, we'll never get to Mars. Just when did NASA's astronauts loose the "right stuff"? They had it in the 50's, 60's, and 70's. Maybe this is something else to blame on the shuttle program after the "test program" was declared over and the e-seats were deactivated. It was deemed so safe, they decided that pressure suits weren't needed. Jeff -- Remove "no" and "spam" from email address to reply. If it says "This is not spam!", it's surely a lie. |
#49
|
|||
|
|||
NASA Studying Russian 12-month Plan
NASA Studying Russian 12-month Plan
Theres that nuclear powered transit craft. theres no real reason to spend sop long in transit. I THINK it was around 2 months each way. Given that less than a year away might be the maximum needed. 2 months transit each way and a few months on mars : : : My opinion is right |
#50
|
|||
|
|||
NASA Studying Russian 12-month Plan
So, you're claiming that a Mars ship using today's technology and NASA's limited budget would be significantly better? How do you arrive at this? To be safe and successful it MUST be way better than ISS. Better yet, devise better hearing protection and ways to retrofit the systems to make them quieter. Do this NOW, so we can use ISS for A mars transit craft will the next generation station, hopefully e will learn from our mistakes : : : My opinion is right |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Unofficial Space Shuttle Launch Guide | Steven S. Pietrobon | Space Shuttle | 0 | April 2nd 04 12:01 AM |
Unofficial Space Shuttle Launch Guide | Steven S. Pietrobon | Space Shuttle | 0 | February 2nd 04 03:33 AM |
Selected Restricted NASA Videotapes | Michael Ravnitzky | Space Station | 5 | January 16th 04 04:28 PM |
NASA's year of sorrow, recovery, progress and success | Jacques van Oene | Space Shuttle | 0 | December 31st 03 07:28 PM |
Unofficial Space Shuttle Launch Guide | Steven S. Pietrobon | Space Shuttle | 0 | September 12th 03 01:37 AM |