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4” vortex rocket cook stove.

 
pollinator
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I have just started to put together a 4” vortex stove, here are a few photos of the progress so far….
 
rocket scientist
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Hi Fox;  
You do beautiful work.
It will be fun to see how well a 4" burns!
Keep us posted as you progress.
 
pioneer
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Fox,

Would you please elaborate some on the materials you are using and its characteristics?  Much appreciated.  Thank you.
 
Fox James
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Hi Thomas, I am trying staying away from ceramic fibre products hence the use of vermiculite board.
The board I am using is rated to 1100c, I have used it many times before, it will show some spiderweb cracks after being super heated but seems to stay together for a long time.
The main issue is its lack of abrasion resistance however it will still last quite well if treated with respect.
I have coated all the exposed surfaces  with a water glass product that does give a little more protection.
On the plus side it is safe and easy to work with, it can be cut very accurately and fixed together with glue and screws.
Some guys have had their vortex stoves running for years at over 750c and the board is still going strong but I would not use it for a J tube fire box.
Having said that there are some very interesting Vitcas products that can be painted on to the board and they might work well for high abrasion areas.
It this case, the stove will not be used every day so I am not concerned about that aspect.
I did a little more today, I cut up a large cooker to get the ceramic glass out for the stove top, I made up the chimney exit and tried it in place….
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[Thumbnail for 43D457B6-0E0F-4866-9F00-9A13A3635F95.jpeg]
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[Thumbnail for 1964F42B-F367-4601-AFFF-D4E58100BC96.jpeg]
 
Fox James
pollinator
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Updated video….
 
Fox James
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I have a problem!
The 4” vortex rocket stove is running far to hot!
I need to calm it right down!

I did a few mods today, one was fitting  a piece of vermiculite under the chimney with a 95mm hole (the biggest hole saw I have) the chimney stack is 105 x 105 square.
I also fitted a step in the ceiling, that can be seen in the last few frames of the video.

I started the stove, top lit with a single fire starter block and the bottom door open, it was smoky for about four minutes and took about 10 minutes to get the vortex spinning nicely.
Then at 20 minutes I put the glass in place as the flame was going over the shelf but that did not stop it and the vortex was going like a mad thing. i left it like that, just running on the under floor air for 15 minutes but it was fast and furious running at 450+ on the hot plate!
I decided to remove the fire box glass and it really did take off in a crazy if not scary way!
Not in the video but I took a hot plate temp reading of 560c …. It was mad hot!!
 
Fox James
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New video update….. it is getting a bit out of hand for such a small stove!
The glass is being pushed to the limit!
 
Fox James
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A bit of an update….
 
Fox James
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Inside the vortex rocket stove, note just how compact the stove is and you can hear how the vermiculite has sintered into a hard surface …..

 
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Love it  .that is my kind of cooking. Beautiful job on the buid.now I'm going to go smoke some chicken drumsticks. After watching the video it made me hungry. Lol
 
Fox James
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My second attempt at cooking a rotisserie chicken, much better this time with a more crispy skin.
The oven runs at around 460-80f for about one hour then it starts to drop off but was still 150f two hours after lite up.
In this case the inside of the chicken was 180f after 50 minutes.
 
Eric Hroboni
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Nothing beats a good home cooked meal. Especially cooked with a rocket stove. If I could only smell it cooking through the video
 
Fox James
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Lighting the vortex stove….
 
Fox James
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Last fire of the season and a couple of experiments ….
 
Fox James
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I have been experimenting again, this is the third video but quite an interesting one!
 
Fox James
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More experiments….
 
Fox James
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I think I might be getting somewhere with my secondary air experiments.
 
Fox James
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Now the prototype is connected to a bell, a bit of a basic put  together attempt but very  successful.
 
Fox James
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We are getting closer to where I want to be…
 
Fox James
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Getting near the end for this little stove….
 
Fox James
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There are two new videos on my channel, here is todays offering…..working a lot better than yesterday!
 
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Your videos are excellent! Thanks for making them, and sharing the failures as well as the successes.. very helpful.

Is there a particular type of screw you use in the vermiculite?

I can't seem to find a source for Skamoenclosure glue here in the USA. Any suggestions for an alternative for gluing vermiculite?

 
Fox James
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Hi Jon, vermiculite is very porous so most high temp glues will work but to be honest, I used to glue every joint but now I try not to use any glue!
I worked out it is far better to allow movement of the individual components, so I pre drill a clearance hole in one piece and a smaller hole for the screw threads in the other piece. Then I dip the screw threads in the glue before screwing the parts together. Vermiculite is quite soft and as a rule you can only use the screw fixing once or in other words you cant take the parts apart and re screw in the  same hole.
Best to use stainless screws but as they will be in the middle of the board any hard metal screw should survive.

Also bare in mind that although vermiculite is fantastic for experimenting it will not be as durable or long lasting as some other refractory products!
There seems to be different grades as well, the one I use is much better than some others I have tried!

Where I live vermiculite is a very common product and sold in many stores, as is the glue and fixings.
In my part of the world,  most if not all new metal box stoves are lined with vermiculite!
 
Fox James
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Fresh new stove…..
 
gardener
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Fantastic build Fox!
Keep experimenting.... love to watch your builds.
 
Fox James
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A little  bit more development…..
 
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Hi James,

Any chance you can share the exact dimensions of your design, or point me in the right direction? I really like this unit because it is so small that you actually managed to put it inside a box!

Thanks Willem
 
Fox James
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Hi Willi, I am still working on the design but as a base working model you can find most of the dimensions here https://youtu.be/Bvw5RU1Gnvw
 
thomas rubino
rocket scientist
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As always,  beautiful work Fox!
Thanks for sharing!
 
gardener
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Fox James wrote:Hi Willi, I am still working on the design but as a base working model you can find most of the dimensions here https://youtu.be/Bvw5RU1Gnvw



Definitely let us know when you get a "best-of-breed" design figured out!
 
K Eilander
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Also, maybe I missed it, but how did you cut the cermaic glass?
 
Fox James
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K Eilander wrote:Also, maybe I missed it, but how did you cut the cermaic glass?



Yeah I have a video for that……
 
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