We studied this when I was in grade school in the 70's. We did an experiment where we put a popsicle stick in a test tube, corked it with a cork with a glass tube it it. When we heated the tube the gas would come out the tube and we got a flame like a bic lighter. Was very interesting. I don't see how they gain the efficiency tho, you need to heat the wood then pull the gas for other uses. I suppose you could use the wood to heat a boiler for house heat, then have a separate compartment to heat wood to get gas for other uses as well, like a propane type water heater or cook stove. When all the gas is out of the wood all you have left is ash just like if you burned it. You can actually watch the process by just watching a fire close. You will see that the flame never touches the wood, it just heats it causing the gas to escape and then the gas burns.
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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