I see the simplicity in it. Tho, i'm not totally sure about the mixing. I don't have time to play with this. But, may be just another elbow at the very end in the port could solve the erratic behavior. Or add some O² to the burn in a more spread manner.
Pretty much like you did the first batch P channel. You said, iirc, that the stream of gases, in the original batch, was squashed down, somewhat, by the incoming secondary air. My, gut feeling, tells me that it is also, forcing the mix with o² too. My idea of increasing mixing, which is yours originally; might not be necessary in this case. Tho, if i was doing it myself, i think i would try that last elbow. Just to be sure.
This idea comes from the carburetor main jet. Sending the petrol perpendicular to the main stream. Here, it would be air, sent perpendicular to the, already made mix.
At the moment I'm inclined to think that erratic behaviour of the flames is a good thing. In fact, I tried about six different combinations of that tube and another elbow at the top. Much like the floor channel in the straight batch box, only horizontal this time. Here's a snapshot of the drawing.
None of the combinations was as good as the straight tube without the horizontal stub. Also, the chaotic looking fire fountain is performing consistently better than the more "neat" and rapid spinning double vortex. That is to say, in the double shoebox configuration. Interesting times, aren't it?
Last Edit: Nov 9, 2017 2:29:20 GMT -8 by peterberg
Finally, I got time to amend the drawing of the Allerton Abbey kitchen. It's a real world example, I'm convinced it should work given a proper chimney and bypass. A door is needed, although this isn't drawn. The air inlet should be around 35 cm² (5.43"²), placed low in the door. The bricks sizes are what was at hand in Montana, used in such a way minimal cutting was in order. The drawing can be downloaded using this link. It's in SketchUp 8 format, so most of the older versions should be capable to load it.
Regarding videos and sketches that show similar concepts: of course they are around, some of them quite ancient I'd guess. I won't claim it is an unique invention, literally everything has been done before when you look back far enough. The point is that I took the time and equipment to work out what seems to be the best and simple layout so far.
The combustion in that last video in particular can't be very clean, the low and wide tunnel I tried showed a nice double vortex but ran dirty most of the burn. There's a fine line between running remarkably clean and not at all, believe me. So please, stop looking and pointing to other examples and promote progress of this concept instead.
Last Edit: Nov 13, 2017 8:33:05 GMT -8 by peterberg
I have a question with regards to the top shoebox.
Did you try a round upper burn chamber? I ask because it is real easy to make ceramic fiber blanket hold its shape in a round/tube form, but the material needs support when laying flat.
I assume the CSA would need to stay the same - and volume should be close. Or, perhaps, it should be treated much the same as a square vs round riser - the diameter being the same as the length of a side.
Given all the other dimensions stay the same, yes. I suspect the burn would be quite different as compared to the experimental model. I think there will be a really nice double vortex but the Testo did prefer the chaotic fire fountain.
panos: Some fireclay products say thy exhibit resistance up to 1000 celsius.Would that be fine for a 150 mm Batch box rocket?Would it be better to search for reistance up to 1200 celsius?
Jul 1, 2017 16:38:34 GMT -8
idahodave: I'm getting ready to build my first RMH, and have some specific challenges. First one is that the site has a high water table, which in February got as high as 8 inches above the projected base of the heater. Any suggestions?
Jul 15, 2017 13:49:58 GMT -8
panos: Can someone make a sketchup file for the support base of a batch box rocket as per Peter's van De Berg following reply:
Aug 13, 2017 11:06:09 GMT -8
panos: those pumice cinder blocks are better suited to a base support. On top of the blocks a ring of bricks, an infill of perlite/clay and the firebox and maybe even a bell on top of that. If possible, arrange the blocks in such a way that there are channels
Aug 13, 2017 11:06:27 GMT -8
panos: under the whole of the heater so heat won't accumulate under there but can be vemtilated away by air currents.''
Aug 13, 2017 11:06:57 GMT -8
SilverFire: Yes, our designs have moved from the experiment design to production, as with the other stove models that were listed on this thread. Hopefully this will inspire others to continue to improve stove designs as we have done.
Sept 15, 2017 7:24:54 GMT -8
SilverFire: Regards and good cooking.
Sept 15, 2017 7:25:18 GMT -8
permaculturebob: citrus paint removers --"citra solve" is one and Walmart distributes another--non toxic fumes, softens tough barrel paint--sometimes it takes a couple applications and some scraping, but I prefer it over sanding and burning
Oct 13, 2017 17:08:53 GMT -8
martinm: Hi there ! I need chart / comparisson on : RSMH vs mass produced wood burning stoves. I need to write a proposal to local govt. to convince them on choosing Rocket stoves for supplying families in poor neighborhoods. Thank you Will look through the threads
Nov 8, 2017 14:25:57 GMT -8
burnclean: You guys all rock !
Nov 14, 2017 15:28:03 GMT -8