LRO development |
LRO development |
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#1
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 ![]() |
Just read this interesting article about LRO
http://science.nasa.gov/headlines/y2005/28apr_lro.htm QUOTE "This is the first in a string of missions," says Gordon Chin, project scientist for LRO at NASA's Goddard Space Flight Center. "More robots will follow, about one per year, leading up to manned flight" no later than 2020." One per Year? Is this just wishful thinking or have any tentitve plans been mentioned for follow up missions after LRO? If the next one is going to be 2009/10 then I guess some desisions about it will have to be made fairly soon. James -------------------- |
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Guest_Analyst_* |
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#2
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Guests ![]() |
Back to LRO. I never understood the "problem" caused by the Delta II spinning third stage. Many spacecraft with lots of liquid propellant (Near, MGS, MCO, Odyssey, Messenger) launched with this stage with no problem. And the delta V to enter lunar orbit is about the same (1,000 m/s) than entering orbit arround Mars.
I guess the switch to EELV has been because of mass issues and/or political reasons (away from Delta II, more EELV launches). Analyst |
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#3
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 ![]() |
Back to LRO. I never understood the "problem" caused by the Delta II spinning third stage. Many spacecraft with lots of liquid propellant (Near, MGS, MCO, Odyssey, Messenger) launched with this stage with no problem. And the delta V to enter lunar orbit is about the same (1,000 m/s) than entering orbit arround Mars. The spacecraft you mention all used bipropellant systems. LRO uses a monoprop system with significantly less specific impulse, so it needs more fuel for a given delta-v. I asked the same question you did, but apparently the tankage involved was outside the experience base of previously-designed antislosh baffles. Probably could have been solved, but it was a development risk. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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