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Post by peterberg on Oct 3, 2018 0:34:11 GMT -8
Looking at your first video above, it's apparent the riser and feed share the same wall where the port is in. I assumed you implemented a J-tube rigged up with a larger feed, my mistake. In your case, there isn't any burn tunnel as in the Evans' configuration.
But... when there is a burn tunnel and one would plan to add a port, this should be at the end of the tunnel instead of the start.
Is this a better explanation? Hard to do, speaking Dutch and writing English all the time, I do get mixed up sometimes.
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Post by satamax on Oct 3, 2018 4:33:20 GMT -8
No worries Peter. I'm better at ease with english. Since i started to learn in 79. I wanted to make it a kind of J tube at first, with a "flame developer" chamber, and port at the back of this one. That's my first drawings. This, to avoid blocking the port with embers. But when you let out the DSR, i thought, why can't i raise the port in the vertical firebox, to avoid that problem. I asked you if the flames could go to the back of the secondary chamber of the DSR, instead of the front. And you said yes. So i took the firebox of the DSR more or less. With it's door against the floor, and air intake at that level. Because of my construction, i have that chamber behind, which you don't like. with space bellow the port. But this can be filled. And a heat riser above. My next plan. Try the ugly thing i have with a P channel. The chamber behind the port, as it is now is something like 22 wide, by 18 deep. I plan to try two heat risers behind, a 20cm one with superwool. And play with two splits above, to restrict the CSA. See what i can do. The firebox has the dimensions of a 15 cm batch. More or less. 22 wide, 33 long, 50 high. And a 15cm riser too. But first one which will go on, is the 20cm one, with restriction. I want to see how it works. The big problem i will have when building this, when i want the final version, is the back end of the firebox, where the port is, doesn't give me much room for laying bricks. I might have to do a visible heat riser, and fit a plate with a hole above, to enter the bell. It develops nice ram horns. www.youtube.com/watch?v=dzChy51yiug Overloads nicely, without belching black smoke. youtu.be/JmO89GBjF-UWhen i leave a slit of 2cm approximately, between top plate and the firebox backwall, it draws there nicely. www.youtube.com/watch?v=c-7RW_QIrVMSo, it's getting on the right track i think. |
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Post by peterberg on Oct 3, 2018 5:49:00 GMT -8
That slit at the riser's side, it reminds me of my first attempts to do secondary air inlet in the batch box. That consisted of a simple u-shaped piece of steel sticking right down to the port. Eventually, I remembered the results with the small scale development experiments and gave the channel an overhang. That made a world of difference, CO-wise.
Something similar has been done by Erica Wisner during the innovators jamboree of (2015?) Split fire bricks around the inside of a small drum and wall of full firebrick to divide the space in the drum in two separate spaces. The port was situated in that separation wall, like you have now. A lid on it with two holes in it, one with a chimney pipe on top. When it catched on for the first time we looked up and it appeeared to run clean almost instantly. It resembled more or less what we know as a pocket rocket with the added twist of the port.
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Post by satamax on Oct 3, 2018 8:26:38 GMT -8
Yep, i remember the minnie mouse thing.
A barrel, lined with splits, and a wall of splits with a port inside.
True, my vertical batch is close.
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Post by Vortex on Oct 3, 2018 8:59:14 GMT -8
Max, maybe that's the solution to your problem (of not enough room for the wall between the firebox and riser). Stop thinking in terms of a firebox with a round riser stuck on the back, make it in one where the port is in the dividing wall.
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Post by satamax on Oct 3, 2018 9:40:24 GMT -8
I think i know what you mean, and have used it before. But, there is 5cm no more.
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Post by satamax on Nov 9, 2018 0:43:23 GMT -8
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lsch
New Member
Posts: 18
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Post by lsch on Jan 7, 2019 11:40:23 GMT -8
good evening to all I have been looking at the forum for a long time now and I have multiplied the tests of all kinds (2 j tubes and several versions of batch box from an insert). but I haven't found the right model for me yet. I reread this thread last night and I would like to try this type of box. I only have sketchup 8 and I can't open the drawings of this thread. Satamax, can you turn them into skp8, please. Translated with www.DeepL.com/Translator |
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Post by satamax on Jan 7, 2019 20:58:46 GMT -8
Heuh, i thought it was un sketchup 8
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