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Post by trenchn on Apr 17, 2012 2:35:17 GMT -8
Hi All,
I have finally got my R.S to a point where I can do a proper test burn. Really pleased with the results. Little smoke, plenty of heat.
I got a small amount of smoke and flame blowing back out of the fuel tunnel, Would this mean that the chimney is not tall enough? Should I remove the small cowl? Lengthen the fuel/draught tunnel?
As you can see from the photo, the fuel/draught tunnel is only a few inches long. The top of the chimney is about 2.0m tall.
Any suggestions welcomed as always.
Thanks
Nick
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Post by matthewwalker on Apr 17, 2012 7:58:11 GMT -8
Your configuration is unusual, or at least, I'm not familiar with it. Is there a vertical heat riser right after your fuel feed, or is it all horizontal to the chimney? Did you insulate the fuel feed/burn tunnel/heat riser?
Without really knowing what you've done, if it's mostly working, I would start by just closing off some of the feed opening once it's running. If you restrict the air intake there it should suck all of it's smoke into itself.
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Post by trenchn on Apr 17, 2012 8:05:56 GMT -8
Hi,
Thanks for that. There is a vertical chamber about 20" high and then a smaller tunnel going to the left, under the second hotplate and to the chimney.
If I make the air intake smaller will it still draw ok?
The whole unit is made from thermalite block which are made from ash. They are a good insulator. There is no other insulation. Do you think I need it?
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Post by matthewwalker on Apr 17, 2012 8:13:54 GMT -8
I suspect that's adequate insulation. I think your heat riser might be a little short, but that's not to say it won't work, just that it'll be a little finicky. When I say restrict the feed, I mean just play with it while it's burning and see if you can get it to pull everything in. I bet you can. Use a piece of metal or a brick or tile and just hold it over half the feed while it's burning. Once you figure out it's behavior you can adjust the inlet size more permanently, but I imagine you will want some sort of adjustable closure there.
In every stove I've built, there is always a bit of "tuning" the inlet depending on the stove and the fuel being used in each burn.
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Post by matthewwalker on Apr 17, 2012 8:14:45 GMT -8
Oh, I said tile there but if you do that expect it to break. Brick or metal would be better.
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