[ft] Orbits in Vector

Does anyone have a system for doing on-table planets and orbits with
vector movement?

I'd kind of like to be able to do slingshot maneuvers and similar as
well,
but they don't work in the attempts at orbital rules I've been playing
with...

Brian - yh728@victoria.tc.ca -
- http://warbard.iwarp.com/games.html -