I have a conventional wood stove with a glass door and flat op with top 6" flue exit. I want to build an insulated secondary combustion chamber on top with the typical rocket stove containment vessel over top of the combustion chamber with a flue exit out the bottom/back. Makes sense to me to fill the existing fire box with extra firebrick on both sides just to make the firebox smaller. Then I have to modify the glass door to accept some kind of feed tube. Does this idea sound feasible to anyone?
Just adding another link to another bell-on-stovetop design. It's a prototype....working pretty well for my needs in a shop space, but not really permanent. Each time I fire it up, I make sure to get the bell (barrel) around 600 - 700 degrees F (based on magentic stove-pipe type thermometer) to keep down creosote build-up. Seems to work well as is, but want to modify the door for draft entry near the bottom and add on exhaust ducting that snakes through piled brick.