"Monte Davis" wrote in message
news
Dumb question: If one were in circular LEO and crazy enough to want a
90-degree change of inclination, what's the cost in delta-v? Is it, as
intuition is telling me, equivalent to throwing away all your ~9 kps
and re-acquiring it all?

It is, but you can play some games here. What you can do is enter a very
highly elliptic orbit, so that you can do your plane change when furthest
away from the earth where your velocity is very small. Once this is done,
you do another burn to re-enter your circular LEO orbit. If you do the math
you'll find that this is far cheaper than doing the 90 degree plane change
in LEO.

Jeff
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