I am pleased to announce that THAT DRAGON HAS ROARED!!! or whatever. The rocket stove in the barn seems to function adequately after only a few hours yesterday and most of today. Actually it was working pretty well after about the first hour today. Maybe the first few hours. I did try pointing a fan into the feed tube. Pretty much the exact fan in the picture above. If the fan helped, I would have to say that it helped push the excess smoke out of the metal can and further into the room more quickly than the drafts would have on their own. So no fan. An hour of working in a smoky room was enough.
The thermal battery is still damp, so that will take some time to actually heat up, but the riser is dry. I figure that a dry and pre-warmed mass will automatically improve the draft. That will just take time.
The one alteration I did to the stove was to add a single brick to the feed tube. From the book I think. This made the opening of the feed box 15 square inches smaller. This choke point popped the draft up enough to keep the stove going. Or so I thought. Before I put the last load of wood in for the evening, I pulled the additional brick out of the feed tube, to see if there was "excess" draft. I went from fully effective, smoke free roaring draft to a meager draw without the strength to pull the smoke down from wood that was only 3-5" long, well below the upper surface of the horizontal thru tunnel.
Tomorrow will see how it starts up after being open to the draft all night. I'm leaving it open so that the moisture can continue to vent. The metal can around the feed tube has a lid that is effectively air tight. I haven't get it figured yet. But I do know that being to at least slow the draft between firings will help hold the heat in the mass. With the amount of moisture still present in the feed tube I figured to just let it breathe.
This thing is just sucking down the wood now. Granted, I'm burning mostly hemlock lathe boards. But so what? It's working. It's not filling the room with smoke. For day 2, I'll take that as a win.