If you catch enough rats you can build a "hamster" wheel instead :D
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nah brian theres two types one that burns wood and the other system charcoal
ive been toying with putting a wood gas system on a series engine as a project,i remenber the grandparents talking of using them before,during and after the war{2}...be an interesting project i think especialy with the amount of wood around here..
some links
The Gengas Page
Fluidyne Gasification - Archive - Since 1976
http://www.hotel.ymex.net/~s-20222/gengas/kg_eng.html
these cover deasel ,coal and wood converters
regards mark