allen, thanks for the warning...it's good that I asked before diving in, I guess.
Is there any way to overcome the laminar flow problem, maybe by increasing the number of pipes in the outflow well above the equivalent area of the 6" stack? Say, up to 12" or even 18" of total area? Or, is the division into separate channels going to cause problems too?
I've read that wood has a lot more BTUs to offer than, say, propane. My current roaster (propane) tops out each time I use it, and it's basically useless in a Kansas winter (never reaches 475F). I think I can get partway there using decent insulation, but was really hoping to find a way to use wood instead of propane. And the rocket stove seemed to offer the most in terms of quick warm up and limited wood use.
Well, even if it won't work, playing with these prototypes has definitely got the gears turning in my head!
Maybe the answer is to try to run the drum vertically with an auger inside...that's a much more complicated build though, in terms of bearings (that will be in the heat stream) and the auger design.