Competing with tractors is a lost cause- - - -they're geared for crawl speeds, and most of them have a flywheel that weighs a hundred pounds or more. The old 2-cylinder John Deere tractors have a huge bore and stroke, and they will idle down so slow you can almost count the revs. No way you're going to compete in that league!
Jerry
Too true. I restored a couple of 801 Ford tractors
http://i99.photobucket.com/albums/l286/Hookalatch/Tractors/1772cb87.pbwThe gas powered one has a 2" thick addition behind the transmission made for roto-tilling (Howard Rotovator). In 1st gear at idle speeds you can hardly see the forward progress. Perhaps the rules prevent add-on gear reduction or the use of hydrostatic transmissions. It looks like its all for fun anyway.