Orbiter-Forum [TransX] Escape Plan launch ... explain what's atually going on?
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 06-14-2012, 03:05 PM #16 dgatsoulis Orbinaut I hope this video explains better. At first you see all the ships from the scenario I posted on post #3 after they have performed the TMI burns. At that point their trajectories are shown relative to Earth. Later in the video you see their trajectories relative to the sun.
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 06-14-2012, 03:14 PM #17 Furet Orbinaut Quote: Originally Posted by blixel  I still can't visualize it. It's just magic. Perhaps it could be easier to understand if we think it is roughly the same situation when we are in LEO trying to reach the ISS: we are pointing prograde or retrograde in order to synchronize our orbit with the target. When we try to reach Mars, we have to change the orbit "inherited" from the Earth and make it tangent with destination's orbit. (Hope this comparison won't drive the specialists mad. )
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 06-14-2012, 03:15 PM #18 blixel Donator Quote: Originally Posted by dgatsoulis  I hope this video explains better. Excellent visualization. That explains it very well. Thank you.
 06-15-2012, 01:05 AM #19 ADSWNJ Scientist Quote: Originally Posted by blixel  Excellent visualization. That explains it very well. Thank you. Yeah me too - thanks Dimitri. So ... treat the line of nodes as the sighting mechanism on an Earth-sized railgun. You want to point this railgun to fire the spacecraft onto the trans-Mars orbit (Rollerball-cannon style, to mix analogies!). You are going to burn somewhere between the two nodes (e.g. dead middle I assume), to fire from the circular orbit exactly into the trans-Mars orbit. And back to FlyTandem's analogy, overarm, roundhouse, underarm - they all end up a rounding error of a difference on a near perfect parallel trajectory as Dimitri's video shows. So back to my question posed to FlyTandem ... if you are in one of these infinite number of parking orbits, with RInc at 0.000 to the TransX eject plan, then is the TMI maneuver going to be nearly pure prograde? (By the way - awesome thread + big thanks all!!)
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