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[QUOTE]Originally posted by Guardian 2000: [QB] [QUOTE]Originally posted by Timo: [qb]In the first category, though, Bernd says that a solid or forcefield-based jet reverser attached to the impulse engines would not alter the net force on the ship. This isn't true, as the end result will still be that the exhaust jet is directed forward, thus transferring momentum in that direction and giving the ship momentum in the opposite direction. The internal structure of the engine does not matter - internal forces will cancel out, save for the one opposite the final exhaust direction.[/qb][/QUOTE]Final exhaust direction is irrelevant. Rockets, jets, et cetera all operate by imparting force on the spaceframe of the vessel, be that a shuttle, aircraft, or what-have-you. The exhaust does not "push against" anything to produce thrust, though that is a common misconception. (It's kinda accurate in reference to hovercraft, where the engine exhaust is contained and provides a cushion of air, but that's not what we're talking about.) Some sort of physical device built to reflect the exhaust toward the front of the vessel would, by default, have to be connected to the vessel. Therefore, the net acceleration on the starship spaceframe would be zero. The only way such a system would work would be if some sort of device could grab the exhaust products, redirect them forward, and in the process cause the exhaust products to impart a new force on the spaceframe, providing an accelerative force against the ship (albeit in a bass-ackwards direction). G2k [/QB][/QUOTE]
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