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pulling heat from Rocket stove

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I am rather new to the idea of Rocket stoves but they have impressed greatly. So much that i am planning to build one for heating my workshop but a few questions have popped into my head that i have not found an answer to. The first is; If i add some fins to the secondary burn chamber so the gases are making a cyclone will it improve the burn? Second i got some car parts around i was thinking of building a exhaust gas cooler then hooking up hot water tank with a truck radiator and fan would this work or would it slow the gases to much to carry the ash out?

thank for any input you can give.
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Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
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Mic Lang : I wonder if you have eaten out at a Chinese, Japonese, Korean diner where they have little alcohol chaffing dish burners, that swirl the flames, is that where- - ?

The hot gases escape out of the top of the Heat Riser, slam into the underside of the top of the barrel, and churn in a doughnut shape slowly down the sides of the drum,(the fancy word for this shape is toriod) This happens as the gases give up their heat creating the Hot air Engine that powers the stoves ability to push the exhaust gases 30 + feet horizontally 1st and 2nd law of thermodynamics, we know this works your way might work also, go ahead and try it, Remember that old saw of Edison's who said he was successful in finding a hundred ways something would not work - and look where it got him g'Luck Allen L.
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