Back to the drawing board...

I want to bring a quart of water to a boil and keep it there for 30-45 minutes. A one-batch gasifier won't do that.

Today I added a better bottom screen (1/2" hardware cloth as opposed to can top with holes drilled). I also added a 2" collar and put the pot stand on that. That collar concentrated the gases and flames and made a BIG difference. However, I had to add wood continually and had quite a bit of smokiness. So...

I'm thinking to put the secondary air holes at the top of my tomato can (4.5" as opposed to 3"), so that my firebox will be 50% bigger. With the collar on top of that, that might give me better results. Also, I'm going to try bigger wood, placed vertically to improve air flow through the fire. I tried finger sized sticks 3" long, and they burned great (big flames) once they got going. I think it may be possible to add a stick every minute to keep the fire going without smoke, thus I can cook raw beans if I want. Yes, I like to sit around the fire and cook!

Stay tuned.
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