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Post by Solomon on Jan 3, 2023 13:41:34 GMT -8
I'm looking but maybe not in the right spot. Is there a DSR3 build thread somewhere? I want to know a lot more about this design, since it seems much different from the previous port-at-the-back-with-secondary-air designs.
At this point, it seems much less like a rocket stove and much more like a masonry heater with a special baffle chamber on top. That's not a problem, don't get me wrong, I just want to understand it before I put a bunch of energy and money into building one this spring.
My present process looks like a DSR2 in an identical bell/bench as the Mallorca build, except an 8" version.
Dimensionally, proportionally, this firebox seems to be different than previous builds. May just be a trick of the eye.
Also, I was hoping to lean toward the upper end of firebox depth/length as I want to burn longer wood. Previous guidelines said 4-5.5xbase, is this still the case? The drawings show a 13 3/8" length on a 6" (I assume) box, which is shorter than standard.
With this flat floor and no secondary air, might it be possible to build in an ash compartment into the bottom of the firebox?
Is the air supply specification the same as prior?
Thanks for your time.
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Post by martyn on Jan 3, 2023 13:59:22 GMT -8
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Post by Solomon on Jan 3, 2023 18:29:05 GMT -8
Yes, thank you, I guess the title wasn't standing out to me. |
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Post by martyn on Jan 4, 2023 0:01:30 GMT -8
There does seem to be an issue for some people regarding the afterburner tube as it can be very difficult to find a suitable ceramic tube in the States.
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Post by Solomon on Jan 4, 2023 9:35:32 GMT -8
I was able to source two pieces of 8" (more like 7.5") ceramic fiber riser sleeves from Zartech in Portland. I don't know if they would be suitable. I overheated my core and glassed them. I don't know what this core is capable of, I haven't seen any numbers. It looks like with the ports that it will be fairly well throttled.
Right now, I'm trying to find good dimensions. I've now read the entire build thread. Unfortunately there seems to be far less detail in how to build this core than others, and it appears that it does not follow the established batch rocket parameters, nor is there a complete set of design criteria like there is for previous core designs.
I can scale the Sketchup drawing up to 8" but I'm not entirely sure how the drawings are sized to begin with because it doesn't appear to be a 6" core. As far as I can put together, it's a 130mm core. If I scale that up to 200mm, that gives be a firebox which is 15 3/4" wide, 14 9/16" tall, and 20 9/16" deep. It also shows a 8.5" diameter tube (what are we calling the tube?).
Finally, materials. What is it supposed to be made of?
I do like the idea of this core. I like the idea of not having to fiddle with a secondary air tube which gets eaten by the fire over time. A 20" length for the firebox is adequate, as my fire wood is generally 16" +/-. And I like the width of the firebox offering a pretty decent viewing window. Ends up with a two and half plus cubic foot firebox, which is nice. I also like that the exhaust is to the back instead of the front, maybe.
But I just need some more solid information about how to build the thing.
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Post by martyn on Jan 4, 2023 9:37:42 GMT -8
There is a thread on the other forum that has more info drawings and pictures.
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Post by Solomon on Jan 4, 2023 9:45:46 GMT -8
Any idea how to find it? I'm searching DSR3 and perusing the RMH forum and I must be overlooking it, as usual.
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Post by martyn on Jan 4, 2023 9:48:47 GMT -8
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Post by martyn on Jan 4, 2023 10:47:21 GMT -8
I dont think the DSR3 has been tested with any mass or a bell as yet?
I know where you are coming from though as a viewing window and a higher feeding point are both appealing.
However the ordinal batch box design is so tried and tested, and you can know buy special ready made secondary air stubs that last for many years.
There is of course the Vortex stove that is also being used successfully and has the most spectacular afterburner display ever!
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Post by peterberg on Jan 4, 2023 13:29:40 GMT -8
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Post by Solomon on Jan 4, 2023 20:33:43 GMT -8
I have downloaded the sketchup model, and scaled it up to what I think is correct, 200mm. Maybe I should do it to 203? I assumed the original was a 130mm.
Is this model ready to go? Do we have a listing of the design parameters? Like proportions based on the base number?
I am going to be building an 8" version of the Mallorca stove, I just haven't picked the core yet.
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Post by peterberg on Jan 5, 2023 2:13:41 GMT -8
I have downloaded the sketchup model, and scaled it up to what I think is correct, 200mm. Maybe I should do it to 203? I assumed the original was a 130mm. Solomon, the recently published core happened to be a 150 mm system. The port is 50% of system csa, the end port is system csa and the space around the tube is 150% of system csa, or more. The afterburner tube in the drawing is a 160 mm internal diameter variant, just because that's available as a hard ceramic one here in the EU. This model is ready to go, no listing of design parameters, it doesn't answers to a base number as yet. The only design parameter is the size of the bell relative to system size as per the standard batchrocket. The Loam Freemanship built successfully 6 of those to date, all 200 mm versions with 3 more in the planning. |
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Post by Solomon on Jan 5, 2023 9:53:03 GMT -8
So the afterburner tube is intended to be the same diameter as the system, plus or minus depending on what's available?
What is the primary air CSA?
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Post by Solomon on Jan 5, 2023 11:25:16 GMT -8
Also, who or what is "The Loam Freemanship?" I'm not finding anything that's sticking out on Google, because I'd love to explore what they've done.
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Post by peterberg on Jan 5, 2023 12:41:18 GMT -8
So the afterburner tube is intended to be the same diameter as the system, plus or minus depending on what's available? Correct. What is the primary air CSA? Quite a bit, the core isn't restricted by the air that's fed in, but by the construction of the core instead. So there's an upper limit in the combustion rate which is pretty hard to get past. I have to calculate what the air inlet would be, I'll come back to that. |
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