Matthew Taimuty

Wonderful work. A labor of love to be sure. Super informative. Makes one wonder why anyone with a source of wood would not choose a RMH. 👍😊

I want your book!!!🥰

People have been cooking with hot rocks for millennia. Nothing like ancient tech to solve a modern problem. Caveman microwave. I love it!! Simple genius.

Glenn Herbert wrote:Matthew, you would do well to remember that a steel core is inherently less efficient than an insulated masonry core; steel can only make sense if you have a source of cheap steel and full metalworking tools and skills. For most people, brick or refractory cement will be much easier and cheaper, and last lonrger.

I just happen to be a blacksmith and a welder. I also have a 7' section of 8" x 8"
1/2" wall square tube that needs a job, hence my interest in your build.

Glenn Herbert wrote:Matthew, you would do well to remember that a steel core is inherently less efficient than an insulated masonry core; steel can only make sense if you have a source of cheap steel and full metalworking tools and skills. For most people, brick or refractory cement will be much easier and cheaper, and last lonrger.

I just happen to be a blacksmith and a welder. I also have a 7' section of 8" x 8"
1/2" wall square tube that needs a job, hence my interest in your build.

[quote=Bruce Woodford][quote=Matthew Taimuty]I've read your entire thread. Love your ideas. One problem. I guess I'm not imaginative enough to understand your design. I wonder if you would mind posting a scematic of some sort? I have a similar space problem and would love to build a RMH. I think your design might just fit the bill. Thanks for putting in the time and energy, beyond the build itself, to share this.
[/quote]

Hi Matt,  Attached are a few diagrams which I hope will help. Please note that these were my preliminary drawings and I have changed the design somewhat as I have gone along.
The first is a diagram showing the relation of the core itself to the air-cooling jacket.  The second is a layout of the air-jacket itself before bending. Please note the following changes which I have actually made from this design:
(1) My air jacket dimensions  are now just over 11" square rather than 9".
(2) I have used 2" flat bar for the cooling fins rather than 1" square tubing.
(3) I allowed only 1" of space between the bottom of the core and the bottom of the cooling jacket and thus left 3" between the top of the burn tube and the top of the cooling jacket.
(4) My heat riser is 7" square rather than round.
(5) My exhaust from the cooling jacket is 7" round rather than the 6" shown.

The 3rd diagram is a cross section of my original design which was a mass of brick filled with sand. That has been made of cob instead and the air cooling exhaust is 7" instead of 6 as the diagram shows. I also made my feed tube perpendicular to the burn tube rather than angled slightly forward.

I hope this helps to visualize the concept better. If not, feel free to ask whatever questions come to your mind.

Hope this sort of design may be helpful to your situation. But the 2 major rules you must keep in mind if you plan to build a steel core are these: (1) Never insulate any part of a steel core, rather air-cool it! (2) Make sure that no part of your steel core exceeds 900F where it will begin to glow and corrode with the excessive heat.  Your flame path temps will exceed this by far but you must keep your steel below 900F.[/quote]

Thanks, NOW I understand. I thought this is what you were doing but now I know. It will, in fact, work really well for my situation. I just had an inspiration; a built in baking oven in the fresh air exhaust and a hot plate on top. You have really gotten my creative juices flowing. Thank you!!

I've read your entire thread. Love your ideas. One problem. I guess I'm not imaginative enough to understand your design. I wonder if you would mind posting a scematic of some sort? I have a similar space problem and would love to build a RMH. I think your design might just fit the bill. Thanks for putting in the time and energy, beyond the build itself, to share this.