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http://www.youtube.com/watch?v=GRPHT9wm5cI&feature=related this is what i think would do just nice. it looks fast enough to go along way but light enough to pull out of trouble. with only 13 horse power a tank of fuel would last all day.
That does look pretty cool. have any idea what it would cost to build? to start with its $20 bucks for blue prints but then it would be a fun challenge after that.