The latest edition of the Firefly "Jumbo" Transport spacecraft, last released in 2006, with newly modified engine and flight model parameters. See the readme file(s) in the Doc folder for details and fun tips and tricks. Go to Mars in 15 hours or less! But watch your fuel...
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Simply extract the contents of this archive into your main Orbiter directory.  Probably a good idea to back them up first, but that's just me and my OCD.
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She's a fast pig, but not as fast as what's coming, and which she'll be a part of eventually!
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Enjoy!
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Warmly,
ZCochrane