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Another application for rocket stove  RSS feed

 
Isaac Punzalan
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Hey guys,

I'm relatively new to all of this and I know that the idea has been considered and tweaked a bit, but I was wondering if there was a maximum length for the horizontal length of a Jtube? The idea that is bouncing around in my head is I want to have a long enough space to fit a length of metal to forge with.

The air intake for the Jtube would be located at the base of the feed, but not the feed tube itself. It would be a similar design to emc4u2's rocket stove design.
https://www.youtube.com/watch?v=2gQH0iHmNJ4&noredirect=1

Most Jtube designs that I've seen had a horizontal length of 18in or shorter, but would the design not be feasible if it was extended another foot? I'd like to hear your thoughts.

Cheers,
Isaac
 
Amos Burkey
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Location: Nebraska
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Hello Isaac. Your forge concept is not too clear to me. There are a few things that I will point out though. Metal is a poor choice of building material for the burn tunnel and heat riser. A decent rocket creates an environment that will quickly cause the metal to fail. In the words of Satamax, "Metal is doomed!" Metal is also very conductive which will conduct heat away from the burn. This will decrease the effiency of the rocket and likely result in a dirty burn. Basically a step back.

There is some very good information about rocketing here: http://donkey32.proboards.com/.

You would be much better served building your rocket from a refractory mix, either premixed or homemade. Here is a video from one of the contributors here detailing a build with a homemade mix.
[youtube] https://www.youtube.com/watch?v=7ANMXGrxgnE[/youtube]

Enjoy!
 
allen lumley
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Isaac : I am afraid that Amos And Max are both correct, and that any copy of the u-tube Frankin-stove will itself fail long before it could serve as a forge.

Any attempt to insulate it will only increase the speed with which it fails due to High Temperature Hydrogen attack and Hydrogen embrittlement !

Ernie and Erica Wisner our moderators here at the Rocket and Wood stoves Forum/ Threads Designed a Rocket mass heater Type cook stove that allowed
for the insertion of metal from the top down into the RMHs Heat Riser and were able to heat iron/ steel to temperatures that permuted 'Working The Metal',
and did so burning hardwood rather than coal.

The important thing to note here is the rocket mass heater (with or without 'Mass') is only a little bit more complex, but burns much hotter than the
temperatures you can 'tweak' out of the rocket stove !

As they are currently swamped with other projects, I have not heard of any more development on the Cook Stove / Forge

Mostly when a Fellow member responds to a question here they are going to assume that you have a PDF or Hardcover Copy of the 3rd Edition of
"The Book" rocket mass heaters.

With over 100,000 RMHs built world Wide- this is 'The Book'! Most RMHs have been built from the chapters of this book, and 95% Of all the 1st time
builds (that Worked) include an understanding of the core ideas, often that alone was enough, But! It allowed people to come here to Permies knowing
that we were all using the same words to describe Our RMHs sizes, shapes, materials, and the orientation of its parts, both to each other and to the
whole !

I hope you found this timely and useful. For the Good of the Craft! BIG AL
 
Satamax Antone
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I've said nothing yet! But



Metal is doomed!

 
Doug Barth
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In the rocket mass heater DVD set they showed off their rocket stove that allowed the work of metal.
 
Amos Burkey
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I cannot comment about the metal rocket in the dvd having never seen it. If the metal lasts in the burn tunnel and heat riser, the stove is not realizing a proper burn.
 
allen lumley
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Doug B : See my post above, a Rocket Stove will not reach the Temperatures needed for Forging, Its use is limited to outdoor cooking unless one
erects a fume hood above it ! The J-bend style Rocket Cook Stove/ Forge was basically a full on Rocket Mass Heater Minus its Thermal Mass !

A year later this unit has ben labeled a minimal success as a cooking unit, burning SO Hot it could not be a useful cook stove for any thing but
making soup ! As a J-bend Forge burning Hardwood scraps, its success was unheard of ! Big AL
 
William Bronson
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I think Doug was saying the stove in the DVD allows one to work metal,not that it was a metal stove that worked

That aside,I would imagine that the goal is a hot zone that is wide enough to heat a long piece of steel evenly.
I am not sure the cookstove /forge would heat evenly a length of steel inserted into the heat riser.
A rocket with a rectangular cross section or three rockets set side by side could be exhausted into an old had grill lined with insulation and refractory.

On the other hand,I have seen hard wood fueled forges for sale.They used forced air,also an option on a rocket forge.
 
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