problemecium wrote:If you want a equatorial orbit you need to create a first orbit that intersect equator, stop yourself at the equator, then point ship at 0 degrees and re-accelerate to orbital velocity.
That's really inefficient way to do it. I learned in Kerbal Space Program that the best way to change inclination is to burn either "Normal Up" or "Normal Down" at the node in your orbit that intersects the plane you want to be on. In SE, if you are in a circular orbit but not equatorial, just hit the "View Ship Trajectory" button. The squares in the orbit, one filled and one empty, are your nodes you want to burn at to change your inclination to equatorial. This works for every planet but try it at earth where you know the equator is. Works just like in KSP and this is how NASA does it as well.
EDIT: It helps to circularize your orbit as much as possible before doing this for best results.
EDIT2: Watch the "i" in your orbit parameters, that's inclination relative to the equator. Get as close to 180 as possible for equatorial orbit. 90 is a polar orbit.