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Project Valkyrie
The Valkyrie is a theoretical spacecraft designed by Charles Pellegrino and Jim Powell (a physicist at Brookhaven National Laboratory). The Valkyrie is theoretically able to accelerate to 92% the speed of light and decelerate afterward, carrying a small human crew to another star system.〔(【引用サイトリンク】title=Valkyrie Antimatter Starship )〕
==Design==
The Valkyrie's high performance is attributable to its innovative design. Instead of a solid spacecraft with a rocket at the back, Valkyrie is built more like a cable car train, with the crew quarters, fuel tanks, radiation shielding, and other vital components being pulled between front and aft engines on long tethers. This greatly reduces the mass of the ship, because it no longer requires heavy structural members and radiation shielding. Where a comparable conventional design like Project Daedalus would weigh several thousand tons Valkyrie weighs a mere 100 tons without fuel.〔 This is a considerable advantage because in a rocket every extra kilogram of payload (dry mass) will require a corresponding extra amount of propellant or fuel, so the Valkyrie requires much less fuel than an equivalent conventional design.
The Valkyrie would have a crew module trailing 10 kilometers behind the engine. A small 20-cm-thick tungsten shield would hang 100 meters behind the engine, to help protect the trailing crew module from its harmful radiation. The fuel tank might be placed between the crew module and the engine, to further protect it. At the trailing end of the ship would be a second engine, which the ship would use to decelerate. The forward engine and the tank holding its fuel supply might be jettisoned before deceleration, to reduce fuel consumption.〔 The tether system requires that the elements of the ship must be moved "up" or "down" the tethers depending on flight direction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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