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Beneath the speed of light, there are two methods of propulsion in Star Wars. It is difficult to gauge how swiftly these methods of propulsion move ships visually, but several frequently analyzed trips in ANH and TESB provide very useful hard information about the accelerations in question. By considering all the trips made and the apparent relationship in speed between the shipsSee Details, we may conclude that ships in Star Wars generally have a maximum acceleration of ~50g.

The first drive of interest is antigravity drive, which uses repulsorlifts. Used by everything from pod-racers to skyhoppers to Death Stars, anti-gravity drives can move a ship into orbit. They push "against" planetary gravity fields, and do not function well outside a gravitational field. Ships mostly use repulsorlifts to take off and land; ground vehicles, droids, remotes, and other land-bound machines may use repulsors exclusively. The acceleration offered by an anti-gravity drive appears to be related to the amount of gravity present.

We also see the conventional rocket thruster used in Star Wars. Rockets work through conservation of momentum; they eject propellant at high speed, forcing the rocket forward. The most commonly seen form of rocket engine in Star Wars is the ion engine, which works by electromagnetically accelerated ionized matter. This is an efficient form of rocket engine, with low waste heat and high exhaust velocity.

Return to top of pageFrom ANH style="border: 0px solid ; width: 20px; height: 20px;">,, we have X-Wings at 42-330g, the Falcon at 19-54g, and the Death Star at 0-23g. From TESB style="border: 0px solid ; width: 20px; height: 20px;">, we have the Falcon estimated at variously between 12-56g with Imperial Star Destroyers. Considering that in ROTJ and ANH dogfights, the Falcon is seen to be similar in capabilities to fighters, while failing to outrace the lumbering Imperial Star Destroyers in TESB, we may best estimate ion engines as providing 50-100g of thrust for most warships, with fighters having substantially more thrust than other ships. This allows for either a nearly Jupiter-sized Yavin or a zero-zero intercept of the Death Star, but not both.

If we assume that the Falcon and fighters have the same acceleration, and none of the incidents are buggy, we have a hard and fast range of 42-54g for warships.