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Rocket Forge?

 
pollinator
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How hot can a wood rocket burner get? I need almost 1800 F to melt silver. I'm wondering if it won't quite get there on its own could adding a hand powered fan to the air intake push it up there? I only need to melt small amounts at a time and I'm talking pure .999 silver not copper alloy sterling.  What material might be needed to construct it? Would cast iron stove pipe work?
 
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Depending on wood type and quality, and if it's sized right, they can melt iron. I'd suggest a refractory chimney and graphite crucible just to be safe. Building it out of metal will draw the heat away rather than insulate it. Just my two cents.
 
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In the rocket kiln/forge that was built at the PTJ 2022 we reached those temps.

Check out the thread for details on how it was built https://permies.com/wiki/184037/Inch-Portable-Modular-Rocket-Engine
 
pollinator
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I believe the highest temp recored in a rocket stove was 2446 f, this was found about 6” up from the bottom of the riser.
A more average temperature, found in a more assessable  place… ie … top of the riser would be half of that.

 
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The fact that it reaches melting temperatures means nothing. You need energy density, (unpressurized) gases do not carry much energy, because they are very very thin compared to hot coals in normal forge. Cooking stove propane flame is around 2000 C and it would not heat anything bigger than a needle to some decent forging (yellow heat) temperature. I would suggest that you will make a testing model from dry stacked regular bricks, experiment and see if it can heat metal to the temperature you want to work with. If it can, you can replace basic bricks with quality refractory material.
 
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Whatever temperature is needed, a working rocket forge was built at Wheaton Labs this summer!

 
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