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Wood gas excavator?

 
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After watching the Geoff Lawton video showing earthworks. I have been thinking about earthworks on the cheep. I expect these excavators must use a lot of fuel. I found a source to get an excavators used. The shipping isn't as bad as you may think if your comparing to renting a machine or hiring a driver. Now the fuel issue needs to be solved. The three fuels I am thinking about on the farm are alcohol, biodiesel, and wood gas. I expect biodiesel would make the most sense but take the longest to accumulate. Wood gas would have some issues with the burner not always being level. I don't know if the fuel lines in a excavator could even use alcohol. Would wood gas even provide enough power?
 
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Location: Kansas Zone 6a
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You can do a diesel/woodgas hybrid--feed wood gas as the air supply and keep some diesel going to light it off and provide surge power.
 
Listen. That's my theme music. That's how I know I'm a super hero. That, and this tiny ad told me:
Heat your home with the twigs that naturally fall of the trees in your yard
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