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Post by peterberg on Feb 27, 2013 12:02:51 GMT -8
Does the calculated port height take into consideration the overhang of the P-Channel? Yes, the overhang should be the same as the gap. By this way, the height of the port will be slightly smaller, this is intended. The p-channel detail at that spot is only overhanging at the front and the sides. The back of the steel duct, leaning against the rear of the firebox, is cut away in order to allow the air stream enter the port at all times. There's a glitch in the primary air inlet number. This ought to be 15%, not 25% as stated. Simple spreadsheet, effective, very nice! |
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Post by stephenson1 on Feb 27, 2013 13:36:51 GMT -8
Thanks for the input everyone. I guess I'll try and put together a refractory mix like this one: www.backyardmetalcasting.com/refractories.htmlI found a local supplier that sells Portland cement with "air-entraining" additives that might be useful for that portion of the recipe. Since my firebrick idea sounds pointless, I may just fill the space between some stove pipes with the same mix and then surround it with the recommended 4 inches of vermiculite. I'll definitely post pics of the process in case they are useful one way or the other. Thanks again! |
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Post by peterberg on Feb 28, 2013 1:04:37 GMT -8
To set things straight, the above calculations are about a Batch Box Rocket Heater, which is entirely different in its workings as compared to a J-tube Rocket Mass Heater. See the thread about this very recent development. It's quite a long thread, but all the information is there. |
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Post by stephenson1 on Feb 28, 2013 4:14:47 GMT -8
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Post by peterberg on Feb 28, 2013 6:15:49 GMT -8
I thought I had read that the "dragon burne" core was based on your calculations. That core is also based on my experiments, but is not the same as the other one. Moreover, the Dragon Heater core isn't open source. So I am not in the position to elaborate on that, sorry. |
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Post by stephenson1 on Feb 28, 2013 7:35:57 GMT -8
I'm sorry. I didn't realize that the dragon burne design wasn't open source. Oh well, I'll figure it out.
Thanks for all the various information though.
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Post by matthewwalker on Feb 28, 2013 8:36:29 GMT -8
Stephenson, the 8" batch stove I just posted a video of is cast using the same backyardmetalcasting recipe. My cast core video mix is far superior in terms of durability, in my opinion. The Portland really makes the whole thing much more brittle. As someone who has used both, I'd go with the clay/furnace cement/perlite.
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Post by stephenson1 on Feb 28, 2013 8:50:45 GMT -8
Thanks Matt. Got it.
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