I just HAD to build one. I threw it together in a very quickly using a metal 5 gallon bucket and some soup cans. I used dirt as the insulation around the pipe. Even though I took ZERO care when building this thin, it was AWESOME!
I'm going to build a better version in the future, I just wanted to mess around with one.
/+1 for a fun little project
http://rocketstoves.org/
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My folks went on vacation and all I got was this lousy sig.