Q about interplanetary transport network

[kelvinzero]

<p>I know that the interplanetary transport can be much more efficient but also much slower than Hohmann transfer orbits but I am trying to get some actual figures on it.</p><p>Does anyone have some representative figures of how long it could take to transfer between the planets and how often windows would open? Also on the merits of the various Lagrange points wrt to the network?</p>

 

[Cygnus_2112]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I know that the interplanetary transport can be much more efficient but also much slower than Hohmann transfer orbits but I am trying to get some actual figures on it.Does anyone have some representative figures of how long it could take to transfer between the planets and how often windows would open? Also on the merits of the various Lagrange points wrt to the network? <br /> Posted by kelvinzero</DIV></p><p>&nbsp;</p><p>It can't be more efficent, Hohmann is by definition the most efficent.&nbsp; It is also only of the slower methods.&nbsp; </p>

 

[kelvinzero]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>&nbsp;It can't be more efficent, Hohmann is by definition the most efficent.&nbsp; It is also only of the slower methods.&nbsp; <br />Posted by Cygnus_2112</DIV></p><p>Sorry, I dont understand your response.</p><p>What I am looking for is some idea of how long it would take an object using the Interplanetary Transport Network to navigate between various lagrange points, and what delta v/ time tradeoffs are typical.<br /></p>

 

[DrRocket]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I know that the interplanetary transport can be much more efficient but also much slower than Hohmann transfer orbits but I am trying to get some actual figures on it.Does anyone have some representative figures of how long it could take to transfer between the planets and how often windows would open? Also on the merits of the various Lagrange points wrt to the network? <br />Posted by kelvinzero</DIV></p><p>I think you need to phrase your question a bit more precisely.&nbsp; A Hohman transfer is not an orbit.&nbsp; It is a strategy for going from one orbit to another orbit, and is a minimum fuel solution to that problem.</p><p>What do you mean by transfer between planets ? Go from one planet to another ?&nbsp; That would depend on a lot of factors, including the mode of propulsion, the planets that you have in mind, the initial conditions at the time of launch, etc.&nbsp; Do you plan to land on the planet or just orbit it ?</p><p>What network ?&nbsp; What is your measure of efficiency ?&nbsp; Minimum time ?&nbsp; Minimum fuel ?&nbsp;What are your constraints ?&nbsp;Are you willing to use the gravitational fields and kinetic energy of the planets to obtain a "boost" as in Gary Flandro's grand tour scheme ?</p><p>Are you considering the usual scheme of flying patched conics with a discrete set of intermediate short burns ?&nbsp; Do you have in mind some futuristic propulsion technology that would allow you to fly&nbsp;under acceleration for long periods of time ?</p><p>What network are you talking about, and what application do you have in mind for LaGrange points ?&nbsp; In fact, why do you care about LaGrange points ?&nbsp; LaGrange points for which two-body systems ?</p><p>I think your question is perhaps a bit more complicated that what you have considered.&nbsp; <br /></p> <div class="Discussion_UserSignature"> </div>

 

[kelvinzero]

<p>hmmm. </p><p>This is me politely backing out of this conversation with you.</p><p><img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-tongue-out.gif" border="0" alt="Tongue out" title="Tongue out" />&nbsp;</p><p>Anyway for anyone who is interested,</p><p>http://en.wikipedia.org/wiki/Interplanetary_Transport_Network</p>