After reading the pdf about the study, I like the idea. It does appear to be rather large as you might infer from its nozzle shown below:
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| frickin' huge |
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| big sucker |
Perhaps something of this size can be lifted using the beamed power idea of Parkins.
It is still of awkward shape that may not be amenable to being launched all in one piece. It may need to be assembled in space after numerous launches.
Once assembled, it could get a crew to Mars in 90 days, it says. Some technical data below ( there's a lot more than this):
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| for 90 day Mars trip, over 1.5 million pounds |
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