I discovered something today. I removed the bottom of the can, and put in a 1/2" hardware screen. Then I raised the can off the ground, used the collar, and discovered a wood blow torch! A quart of water boiled in 5 minutes flat, and all the wood was consumed in 9 minutes! I'll attach a picture.

My next step is to use a bigger can so I don't have the separate collar. A 7 or 8" tall can, 4" diameter, will do it. I'll use the bottom 2" for the stove stand and adjustable intake openings. That way I can tone it down a bit. No sense in having flame higher than the pot. Then it will need a combination windscreen/secondary air heater, which can be aluminum flashing material. the whole thing ought to be light as the bushbuddy, I would think. I think it will be able to boil at least 2 quarts of water for as long as anyone would want, or short time, too.

I don't remember how to add a picture!