You are right the gravitational field in MS does not rotate which goes to further point out the fact that I motioned earlier about the MS model. Only orbital energy could be the culprit if there is any for MS?I Assume that slingshots happen and if that is the case then they cannot be getting that energy transfer from the planets rotation but if they are getting energy from rotation then Ms is wrong and this would emphatically demonstrate the aether medium.. for only a aether could impart kinetic energy to a satellite that passes into its vortices due to the planets spin or the aethers spin about a fixed earth? MS has no mechanism for imparting centrifugal force without coming into physical contact with the planet for the exact reason that you gave the gravitational field dose not rotate in MS ( it can in the AVGM of GS ref: discussions on tides) as such there is no possible way a body can impart centrifugal fore to another body without either coming into physical contact with the body or there is a medium that just as in the case of the aspden motor allows for a transfer of centrifugal force energy to and from the aether medium?. "Dr. Neville Jones" <ntj005@xxxxxxxxxxx> wrote: If the bar magnet producing the magnetic field is rotating then there will be extra energy imparted if your magnet flies by in the same direction, but the World's gravitational field does not rotate, otherwise satellites going "against" the field would need far more energy to overcome this resistance, which is not observed in reality. Neville. philip madsen <pma15027@xxxxxxxxxxxxxx> wrote: As I said before, Philip, gravity slingshots are rubbish, since the speed gained on approach must be lost again on recession. Neville Yet I forgot something . Neville.. If jupiter was on a path away from the sun , at velocity N and the satellite flyby curved by in the same direction, would it not impart some extra pull away from the sun to the satellite? I imagined what if the magnet I was shooting at was rotating away from me when I shot the steel ball very close past it in the same direction.. Do we not have three forces acting on the ball.. One attraction in ...second partial capture which carries it along from its own motion, and the third the pull back which is equal to one, the atraction... This leaves the net force due to the rotation of the large magnet. Phil. PS and I just noticed, Allen come up with similar, except I used the orbital motion of the planet not the rotation... But I think that is what allen meant when he mentioned the magnet experiment.. thanks Allen --------------------------------- Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now.