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Re:SpaceX Soft Lands Falcon 9 Rocket First Stage by Laremere on Tuesday July 22, 2014 @09:57PM (#8072549)
All of these take advantage of Lagrangian points, which aren't present in KSP: http://en.wikipedia.org/wiki/List_of_objects_at_Lagrangian_p...

Not really applicable to this discussion, but one instance which is highly applicable is that you can't control two ships in KSP at once. If your lower stage needed to do a powered land which an upper stage was still accelerating into orbit, you couldn't replicate that in ksp.

Re:SpaceX Soft Lands Falcon 9 Rocket First Stage by m_mueller on Tuesday July 22, 2014 @10:42PM (#8072661)
> If your lower stage needed to do a powered land which an upper stage was still accelerating into orbit, you couldn't replicate that in ksp.

.. Unless your name is Scott Manley ;-). But yes, good point about Lagrangian points [1]. I wasn't aware that KSP is only a two-body-simulation - interesting how the game can hide that with its sphere of influence implementation.

[1]http://forum.kerbalspaceprogram.com/threads/18623-Lagrange-p...

Re:SpaceX Soft Lands Falcon 9 Rocket First Stage by simonh on Tuesday July 22, 2014 @10:50PM (#8072680)
Quick save at stage separation, fly the upper stages to orbit. Go back in time (reload the quicksave) and fly the upper stage back to the landing site.