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[QUOTE]Originally posted by Woodside Kid: [QB] The ramscoop is probably only operable within a narrow range of conditions. An old book I have called "The Science In Science Fiction" has a couple of pages on a ramscoop as a starship propulsion system. It points out that at the density of interstellar space (one to two atoms of hydrogen per cubic centimeter) a 100,000 ton vessel would need a collecting field with a funnel radius of 34,100 kilometers. (How the author determined these figures I do not know.) Moreover, since fusion engines use deuterium, only one atom in 6,700 of what would be collected would be useful as fuel. It seems likely that the ramscoops would be useful only in a fairly dense cloud of hydrogen gas; out in normal interstellar space there would be very little to work with. [/QB][/QUOTE]
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