|
Post by foxtatic on Dec 11, 2020 8:11:15 GMT -8
I have been experimenting with my 7" Sherman Tank DSR2 open system in the driveway until I feel confident enough to move it into the shop (luckily winter has been kind so far.) I'm getting a lot of smoke back. Wondering if anyone can help me out/tell me what to look for as I troubleshoot. I know there's a few out there who are running this open front version of Peters design. Full loads of dry wood that have gone great, smokeless, beautiful secondary combustion... but even those burns have sent some smoke back from the firebox as they settled down. I expected some smoke-back during the initial lighting. But I assumed that once the gasses started flowing through the system, they would keep moving through the flue due to the negative pressure drawing air in, not come out of the firebox too. Was I wrong in this assumption? Should I just accept smoke-back in the open DSR2? Seems like I have too much to be acceptable. Here is a 26 second video showing what a small load of wood does. Being a small load of not great wood, it exaggerates the problem a bit. www.youtube.com/watch?v=l0l8ausB_uM I have the rain cap removed in this video just to remove a variable. Here is the original build post. donkey32.proboards.com/thread/3735/sherman-tank-dsr2-rocket-heaterOne thing you can't see is how the 8" flue terminates in the bell. It's suspended 8 inches from the floor of the tank. I have not yet added the columns of mass inside. Thanks in advance!
|
|
|
Post by foxtatic on Jan 14, 2021 7:19:06 GMT -8
I'll follow up my own post to say I got an answer from a member here, but on a different forum (Permies.) Even an open system needs some restriction to the fire box opening. Some sort of "door" that blocks the opening by 50% to 60%. I missed that this was a necessity in the development forum for the DSR2. So using some scrap ceramic fiber board, I made a hanging door and burns greatly improved. Pic of the "door" permies.com/t/152831/a/128569/thumb-Door.jpg
|
|
|
Post by Orange on Jan 14, 2021 8:50:02 GMT -8
yea I told you I had the same problem so decided to go safe and build closed DSR2. When Peter built open dsr2 he still had doors with metal mesh instead of glass so that restricted air.
|
|