tag:blogger.com,1999:blog-7598615455712402973.post8355365899749876775..comments2024-03-25T11:14:45.840-04:00Comments on Polymath: SpaceX Dragon spacecraft for low cost trips to the Moon.Robert Clarkhttp://www.blogger.com/profile/16114043697010364282noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-7598615455712402973.post-46646174289767722712014-11-25T00:57:52.313-05:002014-11-25T00:57:52.313-05:00Your articles make whole sense of every topic.hot ...Your articles make whole sense of every topic.<a href="http://www.vmwexpress.com/trucking-services/hot-shot-delivery" rel="nofollow">hot shot companies</a>Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-88618677460587674982012-11-02T18:10:37.138-04:002012-11-02T18:10:37.138-04:00"Plus, how would we separate the hydrogen and..."Plus, how would we separate the hydrogen and oxygen in that water? That requires a large amount of energy. People here on earth have been trying to figure out how to do that economically for a long time."<br /><br />On Earth, there is no market for Oxygen made from splitting water- one get oxygen from the air.<br />On the Moon there could be a market for oxygen. For a rocket one using more mass using Oxygen than compared to hydrogen.<br />So if hydrogen is worth $2 per kg on earth, and worth 4000 per kg<br />on the Moon. On Moon you sell the oxygen for $1000 per kg.<br />From 9 kg of water, you get 1 kg of Hydrogen and 8 kg of Oxygen,<br />so from oxygen you get $8000 and hydrogen you get $4000 from the 9 kg of water split. <br />On earth you might pay 5 cents per kw and on the Moon you could spent 100 to 1000 times more per kw [$5 to $50 per kw hour].<br /><br />If takes 45 kw hours to split 9 kg of water, on earth the electrical cost is $2.25. And on the Moon it's $225 to $2250. <br />So $2250 is small part of cost if selling for $12,000.<br />You spend 4500 for the water [$500 per kg]. So total cost:<br />$4500 plus $2250Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-78962404907252499892012-11-02T17:59:12.881-04:002012-11-02T17:59:12.881-04:00"Art HinesSeptember 15, 2012 2:03 PM
First, ..."Art HinesSeptember 15, 2012 2:03 PM<br /><br />First, the mission you reference that showed there is water on the moon, only proved that there is water in that crater. Before we begin to plan on being able to make fuel from water there, we would need to do a great deal more exploration to find out how many more places have significant amounts of water."<br /><br />Yes. If anyone was to mine lunar water they would first need to explore the Moon. NASA should explore the Moon so commercial lunar mining could begin without first needed to spent hundreds of million dollars exploring the Moon. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-90673735840234516802012-10-18T13:23:21.852-04:002012-10-18T13:23:21.852-04:00I agree. A low cost means to put manned craft on t...I agree. A low cost means to put manned craft on the Moon also means low cost means of putting large cargo on the Moon though. I estimate ca. 12 mT of cargo can be taken to the Moon using the same size vehicle, if you use all the fuel for getting there and don't require the vehicle to return. I think this should allow at least a pilot plant to be delivered to produce ISRU propellant from the abundant water ice now known to be on the Moon.<br /><br /> Bob ClarkRobert Clarkhttps://www.blogger.com/profile/16114043697010364282noreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-5198416857150269572012-10-09T11:56:03.165-04:002012-10-09T11:56:03.165-04:00In terms of a commercial market, I would think it ...In terms of a commercial market, I would think it most attractive in the shorter term to use ISRU Lunar oxygen to boost commercial communications satellites from LEO to GEO. That would generate an immediate revenue stream. This would give an 8x payload leverage, e.g. a Proton can put 21 tons into LEO but only 2.5 tons into GEO.<br />Charles F. Radleyhttps://www.blogger.com/profile/06361526748818309051noreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-17432502643449233122012-09-15T14:03:06.304-04:002012-09-15T14:03:06.304-04:00First, the mission you reference that showed there...First, the mission you reference that showed there is water on the moon, only proved that there is water in that crater. Before we begin to plan on being able to make fuel from water there, we would need to do a great deal more exploration to find out how many more places have signifigant amounts of water. Plus, how would we seperate the hydrogen and oxygen in that water? That requires a large amount of energy. People here on earth have been trying to figure out how to do that economically for a long time. The only practical way is to use a nuclear reactor, but I have doubts about the practicality of building a large enough nuclear reactor on the moon. That would require a large amount of propellant to get all of the parts there and the Centaur vehicles you talk about don't have enough payload to carry those very heavy parts.<br />Second, you say that the RL-10 engine is reusable, based on the DC-X test flights. There were only a very limited number of those flights, so the tubopumps on the RL-10 could last long enough for that testing. That does not show that those pumps are durable enough for a large number of engine burns. Even the Space Shuttle Main engines, which were designed to be "reusable", had to be torn down between missions. So, even if the RL-10 turbo pumps were redesigned to the durability level of the SSME, there would still need to be maintanence done periodically. How would that be done?Art Hinesnoreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-76221499989233966212012-05-12T06:30:14.025-04:002012-05-12T06:30:14.025-04:00This is so nice. Now a days the science is so adva...This is so nice. Now a days the science is so advanced and this will become soon able that people will live on moon.<br /><br /><a href="http://www.milltrailers.com" rel="nofollow">Car Trailers For Sale</a>Safdar Alihttps://www.blogger.com/profile/00270407097996992545noreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-59004343744768535292012-05-10T13:47:41.903-04:002012-05-10T13:47:41.903-04:00Like that idea.
- BobLike that idea.<br /><br /> - BobRobert Clarkhttps://www.blogger.com/profile/16114043697010364282noreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-57351020436647002122012-05-10T09:45:42.288-04:002012-05-10T09:45:42.288-04:00Hi Bob
The proposed reusable Falcon 9 first &...Hi Bob<br /><br />The proposed reusable Falcon 9 first & second stages would also be ready-made for Moon landings.qraalhttps://www.blogger.com/profile/13436948899560519608noreply@blogger.comtag:blogger.com,1999:blog-7598615455712402973.post-88642655205710344002012-05-09T12:49:56.435-04:002012-05-09T12:49:56.435-04:00testing, testing 1,2,3 ...testing, testing 1,2,3 ...Robert Clarkhttps://www.blogger.com/profile/16114043697010364282noreply@blogger.com