For those of you that remember me talking about a barrel wood stove in another thread that I mentioned, just to let you know it wasn't very great. It put out some heat when burning it hot, but it consumed a lot of wood to keep that heat going, when it was damped down to get a good burn it didn't throw off much heat. So it was pretty much a waste of time and some wood.
Well after cutting up a couple barrels a few times trying different things I figured I'd try a rocket style heater with the one barrel, some 6" stove pipe and a few bricks to make a down feed with horizontal burn setup.
I made the ash pit and feed tube area with some fire bricks and regular clay bricks, the opening is 7"x7".
The main burn tube is a short pieces of stainless 6" pipe connected to a 90 and another 6" pipe going vertical in the barrel about 20" or 22", there's about a 4" gap from the top of the pipe to the top of the barrel (this could actually be tighter for more heat on the top of the barrel). Where the pipe meets the brick and half way up the vertical is covered with a high temp mortar to keep as much heat as possible in the pipe.
It works very well for being built from scrap pieces and just slapped together, so I'm going to look into building something better over the summer to mess with next winter.
Here's a couple pics so you can get an idea of what I'm talking about and a couple short videos.