I found a piece of 5in steel pipe while rummaging around at the local scrap yard. I thought it'd be funny to turn it into a miniature wood stove.
I slapped it together in one day, thinking it'd be more of a semi functional joke than anything else. Though to my surprise, this V1 actually worked really well, and I went on to improve it in almost every way.
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The first change I made as to add forced induction, by way of a 3d printed turbocharger style blower, because the short chimney didn't provide much natural draft. This created the problem of all the coals and ashes getting thrown out the chimney... obviously not good... so I welded a baffle/grate thing inside the stove to catch the big coals and moved the fresh air inlet all the way to the front. This helped a lot, and allowed me to run the blower at 100% all of the time. At this point the stove was getting properly hot, easily turning steel red and melting aluminum and brass.
After running for 30min straight, perhaps predictably in retrospect, the cheap little 2200kv brushless motor I was using to power the turbo (stolen from a long dead foam board airplane) overheated and gave up. This lead to the final upgrade, at least for now, which was a new and improved blower setup. This new version uses a much much bigger 3500kv brushless motor and a slightly bigger impeller. Though the biggest improvement is the air duct, the fan now directs fresh cold air straight out of the blower and around the motor can, and then into the stove. This means that the intake air now does double duty cooling the motor and feeding the fire.