Orbits and burns | Forum
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March 6, 2010 11:39 pm by astroboy
![<!-- @page { margin: 0.79in } P { margin-bottom: 0.08in } -->
I just found about this site today.. and I think its a cool thing.. to pursue this great dream.. who knows we mite end up being a major contributer for humanities success in space...
Few words to introduce me.. :
MY name is Nitin... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
March 12, 2010 12:04 am by brmj
![Welcome! Those are some skills we could really use. As Luke said, our current CLLARE plans don't call for any particularly interesting orbits, but future missions very well might, and if you could figure out a way to reduce the delta-v requirements without extending the mission much, that would be wonderful. gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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January 14, 2010 6:37 am by Luke Maurits
![I just ordered a copy of this book in preparation for doing a lot more detailed work on navigation stuff. This book is incredibly cheap for what it is (usually textbooks, especially for non-mainstream fields, cost many times this much). Anybody else who is interesting in getting heavily involved... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
March 6, 2010 11:41 pm by astroboy
![Its a basic level book... a good book to start with if you wana leanr this subject... (it was my first book) ...
nitin gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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January 19, 2010 6:26 am by Luke Maurits
![I've been reading this freely available paper entitled "A Comparison of Lunar Landing Trajectory Strategies", and have come across something interesting.
As makes sense, you can afford to lower your TLI delta-v slightly below what is required to reach escape velocity and still get to the moon:... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
January 19, 2010 10:30 am by brmj
![This is a great find! I see absolutely no reason why we shouldn't plan on using this. If we go with the lander on the nose design, a free return trajectory ceases to be so very important, anyway, as long as we make sure we can do the necessary burns given just about any survivable failure of the... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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November 24, 2009 7:47 am by Luke Maurits
![Today I wrote an extremely simple first approximation to the sort of software we will eventually need to use to create our flight plan. It simulates the effects of a Trans Lunar Injection (TLI) burn from a circular Earth parking orbit. One can specify the delta-V of the burn, its direction... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
December 23, 2009 3:59 pm by Jasper
![Nice posts. I did find the little loop strange(As orbits are either elipses, hyperbolas or parabolas on the edge), but i thought it was due to the moon moving. The lisp code on gravity i wrote should be fairly easy to convert to Python/other languages, but i am not sure how well the CLOS methods and... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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December 16, 2009 6:41 am by Luke Maurits
![Here's a detail we have brushed over in our planning so far.
The Earth-moon orbital plane is not the same as the Earth's equatorial plane. The difference between the two plans varies from 18.29° and 28.58° as the Earth wobbles.
We have three broad options:
Launch our CM into... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
December 16, 2009 10:43 pm by brmj
![I would like to point out that with the third option, if we had it orbit the earth a bit before doing TLI, we could extend our launch window enough to deal with short delays by reducing our number of earth orbits.
As a fourth option, we could do something much like option three, but with an arbitrary... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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November 13, 2009 7:09 pm by Luke Maurits
![I think a good first order of business for planning the Hohmann transfer we are planning to use on getting the CSM into lunar orbit would be to find a patched conic approximation to get a first order estimate on the delta-V's of the required burns. No doubt that has been done before, but I... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
November 13, 2009 7:09 pm by Luke Maurits
![I think a good first order of business for planning the Hohmann transfer we are planning to use on getting the CSM into lunar orbit would be to find a patched conic approximation to get a first order estimate on the delta-V's of the required burns. No doubt that has been done before, but I... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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