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[QUOTE]Originally posted by Guardian 2000: [QB] [QUOTE]Originally posted by Treknophyle: [qb]Referencing the 'reverse exhaust' discussion. 1- A close look at the ventral surface of the E-e's impulse bays shows 4 rectangular vents - which I interpret to be reverse-direction thrust ports. 2- However - I must disagree with the argument that a force field-based thrust reveral nozzle would be ineffective: a- The plasma would be vented forward at high speed. b- There is a verifiable degree of 'momentum feedback' with shields (if a meteor of bolt of energy hits the external shields, the ship as a whole is shaken. I assume that the momentum is transferred back to the generators (which therefore must be braced and welded down).[/qb][/QUOTE]If there are forward-facing ports near the shuttlebay, they could be used as reverse thrusters. However, they would either have to have their own power source, or else the IPS reactors would (A) have separate outlets for the thrust, closing off the rearward ones or (B) the reactors themselves would have to turn to blast in a new direction. As for the "vented forward" argument, the principle is that first, the fusion reaction exhaust would have pushed against the front part of the reactor, exiting out of the tail and producing forward thrust. Any system which causes the exhaust to reverse direction (even a forcefield) will be doing nothing more than "bouncing" the exhaust toward the front of the ship, canceling out the forward thrust and bringing the thrust total down to zero. Just because the exhaust products are now headed forward does not mean that the ship must now move backward. If you need confirmation, take a nasty little cheap-o plastic toy car . . . something light, but big enough to tape a balloon to. Take the balloon (blown up with air), tape the bottom of it to the car, and then let go and watch the car fly. Now, attach something big and flat to the back of the car. It doesn't matter what it is . . . it can be a big flat piece of cardboard, a sail/parachute, or a nifty something designed to redirect the airflow backward. As long as you do your job well, the car isn't going to move. The only way it would move the way you want it to would be for you to make something to catch all of the air out of the balloon, hold it, and then blow it out toward the front of the car. But, it would just be easier to turn the original balloon around, or the whole car. G2k [/QB][/QUOTE]
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