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Hi - I just started studying in preparation to build a rocket stove. I'm confused about what materials can be used for the inner pipe of the heat riser. My hope is to be able to use either a 6" cast iron pipe (old plumbing pipe) or sheet metal piping from Menard's that is typically used for duct work in a home. Should I have any concerns about using either of these two materials? I'm planning on using a sheet metal pipe for the outer layer to contain the insulation. Thanks in advance.
 
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IMHO,
use insulative high temp refractory materials in the combustion tube and riser, only use metal as a sacrificial form

see Rob's Rocket Heater Autopsy: http://www.youtube.com/watch?v=54lOrITaXpc

an optimised combustion "engine" will easily produce 2000F +
 
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When building a j barrel stove is it important to make the vertical pipe larger size than the horizontal pipe? Is it possible to use the heat in a clay bed like the brick ones? Any help would be great
 
Paul Tofflemire
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Can a clay flew be used in the rocket stove? Does it have to be insulated?
 
I found a beautiful pie. And a tiny ad:
Rocket Canner Fryer and Forge - Draft Plans
https://permies.com/t/64465/Rocket-Canner-Fryer-Forge-Draft
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