I've been working on this for the last few days. It's a homemade stove but proven to run you out of a 30'X30' area. Big improvement for my little area! I can use larger logs and not feed it so often. Here's some pics. First the wimpy old stove. I have a 6"X24" piece of pipe next to it so you can see the difference.
Now for the 'mother-of-all' stoves. Same piece of pipe next to it.
Now for the 'mother-of-all' stoves. Same piece of pipe next to it.