Testing My Concrete And Perlite Rocket Stove

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Testing My Concrete And Perlite Rocket Stove 4.5

I test my new concrete and perlite rocket stove, first as-built and then adding a makeshift J-tube. Please comment with ideas for the best J-tube design.

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💬 Comments on the video

Enjoy the vids! A few friendly pointers from an old retired building guy:
Dryer mix, stronger concrete,
Rebar or wire mesh (fencing) for reenforcement, 28 day cure is an industry standard.
Smallish fires early on, then gradually hotter later. Excellent DIY..
Great job man!

Author — randy Parnell


Using harbor freight coupons for fire starting. Those savings are so hot! Lmao

Author — Willette Entrepreneurial, LLC


Great videos. From what I've heard about rocket stoves, there's a formula to determine the size of the and angle of the J-tube. Too big, and it doesn't create the updraft that you're looking for, and too small, not enough air gets to it. (might be the issue with your fuel. Too much in the chamber prevents airflow. Smaller sticks burn better and hotter) Check out Ianto Evans vids - the inventor of the rocket mass heater. And one more thing - inoculate your biochar in compost (even better, compost tea) before adding it to your garden. Again, great videos. Cheers.

Author — MrPixelrancher


Just started watching your rocket stove video's, love them and great job. Thanks for sharing.

Author — Kondrites


Looks like your having fun. Big picture: Consider abandoning J tube design if primary operation is going to be cooking. Most cooking activities are short in duration in comparison to normal longer duration heating applications. Higher firepower, ease of managing combustion chamber (cleaning & operation) and use of non-uniform fuel is going to be more efficient.

J tube designs were created for heating (rocket mass heaters) and long duration burns using uniform fuel. Gravity is a great friend using uniform fuel (i.e., pellets or uniform sticks), for self feeding functions. Non-uniform fuel is more efficient pushing in stove on a horizontal plane. Unless you want to spend time preparing fuel, the J tube design for cooking may work against practical cooking operations. Cooking & heating are different applications.

Biomass cook stoves with horizontal side feed is intentional and designed to accommodate different shaped found fuel ( sticks, branches, palm fronds, corn cobs, peanut shells, etc...). More fuel, higher fire power, less fuel lower firepower cooking. Side fed fuel control is typically easier with more precise control. By sticking a J tube on the side of a rocket cook stove does not turn it into a self feeding appliance. That is a misconception. Biomass fuel, unless prepared is just going to lay in tube unless manipulated. In summary, we find horizontal feed offers more controlled cooking functionality. Long duration cooking is performed more efficiently with TLUD batch stoves.

Todd Albi, SilverFire Stoves & Cookware

Author — Todd Albi


Lint from the clothes dryer is a good fire starter !

Author — stormy613


Love from indonesia, gonna make this project when i got home in the village.

Author — Jo Alfonsius Wolfenstein


Try ad a j tube inclination for ash also. So the ash drops easy .ad a ceramic fire rezistent tube inside your stove.

Author — G Pretorian


Ireland: love your thinking behind your project, problem solving all the time.
That is what life is all about. Find the need, try to solve it, never be afraid to fail as you have just eliminated one problem. Go again and have pride in what you finish. I love what you have finished and hope you much success, god bless

Author — Michael Conaghan


You know there is a rocket stove that we built I remember when I was younger my family ancestries are from India
So I used to watch them build the rocket stove with clay and cow manure, yes the manure from the cow had to be dried and was used because of the straw in there together with the clay.( we used to have white clay though I see you have red clay maybe that would of worked) yes it did have a smell in the beginning but by the first crank of the fire it all went away.
it would be maintained by layers of white clay mixed again over it

Author — Cindy Racrich


Insulation causes the inner wall to expand faster than the outside. Perlite is full of air that will expand and contract destroying the stove and may also cause small explosions making the stove unsafe. Finding what dose not work is just as important as finding what will work and if others know what dose not work then you have not wasted your time.

Author — Sidney Easton


Try wrapping the stove with some type of metal band to pull it snug together.

Author — John B


Mexican clay-ware "fireplaces" come with instructions since they are not fired in a kiln. You set 3-4 small fires first and let it fully cool down. This "fires" the "stove." Then they are ready for full duty. Another idea is to use refractory cement for higher temperatures. An armature will not prevent cracks. But it will keep the cement from falling to pieces. (Ask any concrete finisher...) To get the flames to swirl, place the j-tube as far off center as possible.

Author — OgMandin0


I love your build and recycling efforts!.
I'm definitely gonna give it a go!

Could the rocket stove be used to heat a hot plate?
Maybe by adding a simple up and over design flat steel plate, this would act as a direct cooking surface or you could put frying pans etc on it?
This would possibly make cooking on it more versatile?

Author — That Guy


Thank you for taking the time to share this with us. I would suggest that you look into using sodium silicate as a binder rather than cement, if you haven't already, on one of your future builds. And by the way I disagree with you about the train ... I think you could easily stop it if you really wanted to. :) Keep up the great work.

Author — jdwagman


The issue is time my friend !! Been working with concretes my whole life, my guess is it was still too green, then too build small small fire not the hot fire you started out with. Gently drying out the concrete, unless you go with hitemp concrete or kiln concrete, but very nice effort anyway

Author — Scott Sutton


Dang the fire was going good. Hate that the crack happened. The J Tube construction looked like it needs more work. Great video keep up the good work

Author — Backwoods Raised


Great job.
Have you thought of just wrapping the cracked area with some kind of material that you can make decorative and most importantly not able to catch fire? 😉

Author — Clint Young


Love the three videos, Love to see you trying to community improve the design.But the air vent from the bottom needs to be blocked off during use, it can be opened when cleaning. But the rocket really moves when they air flows from over the fuel.

Author — Other Restrained


Re the crack: One of your comments said to cure it for a month. Also, I thought I read a comment about slowly heating it the first time you use it.

Author — Micky Lee