DSR Mark 2 with cooktop oven and side exit

[josephcrawley]

I've been asked to design a cook stove around the DSR2 core. This sketchup has a 6 inch (150mm) core with the top box stretched to fit a recycled glass stove top of 28.25x20.25(inches). The exit is moved to the side of the top box and the stumbler is stretched to stumble the air for the full depth of the box.

I realize this is a large change to the core and the repercussions are hard to predict without building and testing with a testo. I do not have a testo nor the means to purchase one so once again I must ask Peter in his infinite patience if this seems like a good idea or a sick mutation of his creation.

You'll have to imagine the brick surrounding the core. There would be a brick bell on the right of the core that would have a bypass that would be left open for summer cooking and cold starts. If anyone has any ideas about alternate arrangements I would be happy to hear them. It will probably be more sensible to shrink the oven door so that the stumbler can be supported from below on the door side to ease construction.

thanks very much

Joseph

sketchup file version 8
This image is with the glass cooktop hidden.

[peterberg]

So my patience is infinite... I don't view myself like that, I can be very stubborn/impatient now and then.

Regarding the cooktop, the pictures aren't visible and the skp file can't be downloaded. Maybe those files aren't marked as public?

I've played with the idea of a side-vented core (and a glass top with that) but it won't be easy to determine the size of that exit port. On the other hand, a radically different core as Trevor's, loosely alike the DSR1's configuration seems to function best with the same riser port/exit port proportions. So let's see what it's all about.

Have you considered a sidewinder DSR2 core?

[josephcrawley]

Jun 26, 2020 6:42:30 GMT -8 peterberg said:

So my patience is infinite... I don't view myself like that, I can be very stubborn/impatient now and then.

Regarding the cooktop, the pictures aren't visible and the skp file can't be downloaded. Maybe those files aren't marked as public?

I've played with the idea of a side-vented core (and a glass top with that) but it won't be easy to determine the size of that exit port. On the other hand, a radically different core as Trevor's, loosely alike the DSR1's configuration seems to function best with the same riser port/exit port proportions. So let's see what it's all about.

Have you considered a sidewinder DSR2 core?

Sorry about the busted links. Google seems to cache permissions on hosted files so even when I logout of gmail to test the post I can still see my photos making me think others can as well. Hopefully they are fixed now.


Regarding the sidewinder I had considered it but thought it would be make the core even further from what you have tested. It would allow the glass top to be wider instead of deep on the cooktop which would be more ergonomic, If you think it would be the better way I would definitely give it a try.


Another thought deep in the DSR2 development thread a question came up about the stumble being on the floor instead of the ceiling and as I recall you said it was such so the top box would be easier to use as an oven. Perhaps with a larger top box oven it would ease construction to put the stumbler on the floor and out of the path of the area behind the door.

Peter considering the number of questions you get bombarded with on this forum(some good and some not so good) I consider you very patient!

thanks

[peterberg]

Given that the basic batchrocket setup's riser could shift to the side without repercussions I am convinced this could also be the case for the DSR2. Viewing from the end of the riser to the exit port there would be a straight trajectory just like the development core. The stumbler could be at right angles with the gas stream as well.

The DSR2 isn't that different as compared to the basic arrangement as far as the firebox, riser and bottom half of the riser are concerned. The deviation lies in the parts that are above the firebox' ceiling so it would be sensible to try to match that as closely as you can. A sidewinder DSR2 arrangement in the cookstove you propose would only be different in the width of the top box, in my opinion. Most if not all of the secondary combustion is taking place in the riser stub, the top box is acting as an expansion room mostly.

Last but not least, a DSR2/cook stove would be a very interesting build, don't you think?

Edit: as you can understand I could download the file now, but the pictures are still not visable.

[josephcrawley]

Jun 26, 2020 11:54:42 GMT -8 peterberg said:

Given that the basic batchrocket setup's riser could shift to the side without repercussions I am convinced this could also be the case for the DSR2. Viewing from the end of the riser to the exit port there would be a straight trajectory just like the development core. The stumbler could be at right angles with the gas stream as well.

The DSR2 isn't that different as compared to the basic arrangement as far as the firebox, riser and bottom half of the riser are concerned.The deviation lies in the parts that are above the firebox' ceiling so it would be sensible to try to match that as closely as you can. A sidewinder DSR2 arrangement in the cookstove you propose would only be different in the width of the top box, in my opinion. Most if not all of the secondary combustion is taking place in the riser stub, the top box is acting as an expansion room mostly.

Last but not least, a DSR2/cook stove would be a very interesting build, don't you think?

Edit: as you can understand I could download the file now, but the pictures are still not visable.

Sketchup link

Here's a redrawn core based on your recommendations, The firebox is your brick sidewinder with an expanded DSR2 top box on top. Do you think the off center floor channel will have an adverse effect on the primary air intake on the right side of the air frame?

The Stumbler is centered on the width of the top box. It seems that it could be placed on the floor since it is well out of the way of the door and this would save a long piece of ceramic fiber board.

Link to picture I'm giving up on embedding images


And yes this is a very exciting concept!

[peterberg]

You're probably right in that the off-center floor channel could effect the intake of the air frame.

There's a fact you need to know about the stumbler: on the floor it need to be much larger. In the sense of brick size, two on top of each other. Maybe you need to have a look at Yasin Gach's wark. As I see it, his batch block is quite close to what you've drawn.

www.uzume.fr/plans-poeles-de-masse/B8-avec-banc

[josephcrawley]

Jun 29, 2020 9:34:29 GMT -8 peterberg said:

You're probably right in that the off-center floor channel could effect the intake of the air frame.

There's a fact you need to know about the stumbler: on the floor it need to be much larger. In the sense of brick size two on top of each other. Maybe you need to have a look at Yasin Gach's wark. As I see it, his batch block is quite close to what you've drawn.

www.uzume.fr/plans-poeles-de-masse/B8-avec-banc

yasin designs are inspiring. It would be interesting to hear his cooking performance from a cold start. All the pre version 7 designs seem to be very mass heavy in the plancha with a hard brick layer just below a steel top. I like how compact the design is. If the bypass was relocated to the "end" of the top box instead of the beginning it would be preferable for summer cooking.


I helped build a Matt Walker stove a month ago and that was my first experience with the neoceramic cook top. I was skeptical but I think I like the glass top now. I think you or someone else said the DSR2 would not retain enough heat in the top box with a metal top.

[yasin]

hello josephcrawley

I haven't used a cookstove for more than two years now, but when I used it the heat would go up to 450°C (ie 350°C max in the cooking pan) as I recall. Also, the U shaped path of the batchblock was good to have different cooking temperatures. We would cook food only with the cookstove during the winter.

We have two models : the B8 which is a small mass heater and the C8 which is a cookstove. The C8 has nothing under the steel plate : the flames are in direct contact with it. If there are hard brick right under the plancha, then the temperature hardly goes above 150-200°C.

Regards

[josephcrawley]

Finally got around to building this stove. Had to build the house first. Pretty good to use so far. Slow to make coffee but heats the space very well. Haven't baked in the black oven yet but might this weekend.

Only downsides are the normal dsr2 ones. Slow to start from dead cold, house can get smokey. Smokes out the door regardless of state of the fire.

I'll try and do a proper right up after I finish the wall behind and clean it up oh and finish the metal work.


photos.app.goo.gl/ashio3ycNF3RAKMa9

[martyn]

Wow that is a fine size construction !

[Orange]

that thing is huge I'm curious to hear how it's going.

Regarding smoke at startup check this, works for me: donkey32.proboards.com/post/36637/thread