Inverted downdraft gasifier.
I modeled this one after the stove featured in this bpl thred from 2008. It provides a brief but concise write-up.
The stove pictured above and the stove in the 2008 article differ in only a few ways:
- I used a "start collar" as the pot support instead of hardware cloth. You can find one in the plumbing section of one of the bigger hardware stores.
By bending the precut tabs, a start collar can form a nice tight fit.
A start collar is firmer than hardware cloth, yet still easy to manipulate with a pair of tin snips or even scissors. It acts as a small windscreen where it counts, and by drilling out the two rivets that hold the piece together, the circumference is customizable allowing it to nest in the can's rim when in use/inside the stove when not. I did my best to imitate the Bushbuddy's pot support:
Bending the tabs that make contact with the stove make it significantly stronger.
- Rather than JB Weld, I used Rutland Furnace Cement:
This is no epoxy, making it ready to use right out of the tub. At $5.00, it's hard to beat.
J-B Weld claims the red and black stuff can withstand a constant temperature of 500 degrees fahrenheit. Rutland claims their's "withstands temperatures over 2000° fahrenheit without failure." I'm no chemist, and I've only used it in this one application, but it appears to be a myo-stover's dream. Maybe someone with more experience with the product could chime in.
- Not having a punch, I just used a drillbit for the holes. A punch would have been much cleaner, but with a few hand files and sandpaper you can at least prevent the holes from slicing a finger.
- Lastly, prior to assembly, I two-coated all of the components not exposed to the flame with Rustoleum's high temperature paint. I've been curious about the proper application of this stuff. If it provides even a little bit of safe rust protection, I'll be satisfied. The metal seemed happier in general, post burn, with the paint.
The stove all packed up. The top lid is not necessary.
Save the bottom from the larger can in order to properly stash the windscreen inside the stove.
Remember that any pot support/windscreen combo should provide access for adding fuel.