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Post by saslex on Mar 29, 2019 17:42:27 GMT -8
Thought I would start a thread on a batch rocket I am planning to build. It will be from PvdB's design, though I have modeled this in inventor rather than using the skp. I am planning on using barrels, and surrounding the core with a steel enclosure, with the idea being that this will be portable. I intend on using to heat the garage whilst i am out there working on projects etc and it will need to be moved to put cars back in so not going for a mass as such. As this will be portable I am also thinking of adding a bell design bench (half barrels with earth on top possible) for the deck at some stage. The hardest thing to find in research has been the castable recipe. I have found one that looked like it worked ok here repeated below - www.youtube.com/watch?v=AbdNi09ZPgcall parts by volume: 2 parts ciment fondu high-alumina cement ( www.trademe.co.nz/Browse/Listing.aspx?id=1999272131)2 parts powdered fire clay (Can I use Pumice in place here ? www.ausperl.com/nz/product/milled-pumice-25l/)1 part fine sand 4 parts perlite ( www.easygrow.co.nz/hydroponic-mediums/234-perlite-10l-.html)4 parts clay pebbles ( www.easygrow.co.nz/hydroponic-mediums/242-clay-8mm-16mm-45l-.html) Happy to take any suggestions on the castable, rocket design. I intend to simplify the steel casing a bit from what I modeled......it is rather a lot easier on the computer than fabricating..... The other question I had was roughly what sort of volume do I need to plan for the castable? I tried getting the answer out of Inventor, however I doubt one of the batch box pieces is 2600 odd litres.
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Post by peterberg on Mar 30, 2019 1:14:44 GMT -8
Hi Saslex, welcome to the boards. The firebox is protuding out quite a bit, what system size are you planning to build? Some remarks: the riser doesn't need to be in the centre of the barrels. For casting the parts of the core you'd better to buy specific refractory castable instead of a home made recipe.
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Post by gadget on Mar 30, 2019 7:07:32 GMT -8
If you are going to be moving it around allot, I would consider ceramic fiber product where ever possible in your build. It is more durable then brick and mortar as far as bumps, movement and shifting.
This is very similar to a 3" system I want to build that can sit next to my gas water heater and share the same 3" chimney. I would love to do a double shoe box but I don't know if it will scale to 3 inches
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Post by Dan (Upstate NY, USA) on Mar 30, 2019 13:04:54 GMT -8
You'll have to support the riser somehow in the barrel so when you tip it and move it it doesn't fall over inside the barrel.
Unless you intend to take it apart every time you move it.
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Post by saslex on Mar 30, 2019 15:33:49 GMT -8
Hi Saslex, welcome to the boards. The firebox is protuding out quite a bit, what system size are you planning to build? Some remarks: the riser doesn't need to be in the centre of the barrels. For casting the parts of the core you'd better to buy specific refractory castable instead of a home made recipe. This is the same dimensions as the '3: Straight cast core, 4 parts' on your website. 6 inch? I have seen a few others with the riser non central, at this stage I was just using the Inventor model to play with some ideas and to get the dimensions of the molds I will need. Once I am back in NZ I will see the availability of castable refractory. You'll have to support the riser somehow in the barrel so when you tip it and move it it doesn't fall over inside the barrel. Unless you intend to take it apart every time you move it. No the idea would be to be able to wheel it out of the way whole once used. I had thought about that, just hadn't put it into the model.
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Post by gadget on Mar 31, 2019 7:06:25 GMT -8
a 5 min riser should be really easy to secure to the inside.
If you are going smaller then 6 inches, I would consider not doing a bell or bench after the drum. From my experience, the draw is just to weak and the extra heat is needed in the chimney.
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