As a fellow welder, I appreciate those welds, first thing I noticed!

Several things to add: there's to be certain height of chimney tube for max efficacy: the afterburner effect for the flammable volatile products of wood pyrolysis, which are burnt while acsending. For 100 mm diameter chimney, it's to be at least 600(!) mm height. Secondary contour as small holes in chimney additionally deliver air for more complete combustion, reducing height for 6-8%. Also, the horizontal feeding tube doesn't allow wood to drop by it's weight into the combustion area. Though these stoves are for cooking seemingly - size and flame! "Perfect" rocket stove works by heated gases only, however they may get to 1000*C = 1832*F!

Finally someone who put it in layman's terms that make it very easy to understand the more complex, thank you.

Your work and explinations are perfect. For an easy add on, weld a small pipe to the top inside of the combustion chamber. This should give super hot air.

Drawing (intake), draft, and exhaust (flue) are all good words to describe the movement of air through a stove.

Great video and good explanation of the basics. I like the idea of using angle iron in order to ensure the airflow isn't blocked. I guess the same is achieved by adding a 45 degrees tube or pipe as fuel feeder, which leaves the horizontal arm free for intake of air. Another idea would be to add a small grill at the point where the three tubes meet, and underneath add a sliding pan with its own opening that collects the ash, and can be removed even when the fire is still going, and emptied. I'll know more as soon as I've tried to build one myself. Regards.

Thank you for your information! I've been doing research randomly learning in and outs about them

And that's what passion is called! On your YT channel, from listening and watching you get warmer and happier!

Of all diy videos I've seen, your welds appear to be the absolute best. Very nice craftsmanship! Most others leave their metal parts looking like they're adhered together with chewed bubblegum.

Rocket stove. Intake =X, Exhaust >X. I think everything you've made pretty much fits that. I don't have a welder so mine are brick, cement, and tin. Dad often told me to utilize my resources. And that's what I do. Love the taste of meat cooked over sticks. I haven't bought gas or charcoal to cook outside with for 25 years. Peace brother.

6:36 you could make a little cavity on the bottom that could serve as a secondary air intake and an ash dispenser

Thank you for the inspiration to finally start using my brand new welder which has been sitting in our shop for over a year now. I feel like I can make a rocket stove and may experiment with a gravity fed method for “fuel” to add itself in as required for longer cooking cycles.

I know this has been out a couple years but you are very informative and I have learned a lot from you Thank you. Also would love to have one of your hot water tanks for an off grid hot tub

Hi there. Is there a reason not to have the fuel input leaning at 45 degrees to allow a bit of self feeding? Assuming a separate channel for air flow.

Thank you. Finally some one explained it properly --Nice welding by the way ..Thanks mate.

i light mine and walk away for 1hr !! wood port at 50 degrees, would slide in automatic, (gravity) air intake below the wood intake.. grid added, acts as a choke, wood lasts 30% longer

Your rocket stove is using the fuel way more efficiently, that’s one reason the fuel last longer. Would it be possible to add a trap door on the bottom to dump out the ash? Love the build. Keep pushing the boundaries.

im thinking of building a conventional block bbq in the back yard but also incorperating a large rocket stove into in to use as a wok burner etc , would u have any ideas on the design and best way to incorperate it into the bbq , thanks i really like your work that pressure cyd stove / hot water system is a beast

After watching loads of yt videos, trying to understand RS technology, I finally got it. Thanks a lot.

Excellent description and build quality man !. Like your dumbell positioning device. My welding reminds me of one chicken crapping in a box. Thanks. Dave

Any advice on how to design a hot tub heater? I would like to build a hot tub out of steel and integrate a rocket stove.

Thanks for the great video. Good explanation of the combustion issues and I like your flame maintenance slot in the fuel stick tray and classy welding. Keep exploring. I make tiny light (SS or titanium foil) Aussie stoves for alpine backpacking (described in the links below). They are kind of 'rockety' but, at as little as 500g weight, they don't qualify fully because they have no heat riser (metal, ceramic, round, square or otherwise). However, they have ceramic lining in the hottest parts (to retain heat for initial combustion and protect the metal) and have 'J-style' fuel stick feeders that let the sticks feed themselves into the pyrolysis chamber that naturally regulates the amount of fuel that can be pyrolysed at any time (like yours). The steady plume of wood gas completes its combustion, in the stove box/cooktop/ heater, having passed through a bed of glowing charcoal and air mixing is aided by rapid changes of direction of gas flow within the stove box. The combustion is very clean and efficient (only~400g/hr with no significant smoke or any sparks from the flue pipe). Most of the air enters between the sticks (no separate air path as in yours) and the stove makes a quiet chuffing sound which I think results from the burn rate pulsating during the natural self regulation process. As in your stove, ash builds up at the bottom of the J-tube and restricts the burn chamber volume, but it is slow to accumulate and can be pushed out of the way into the stove box. The useful heat output is from the stove box inside the tent. I view them as regulated smoke generators that burn the smoke completely. I would be interested in your comments and if you think I have a correct understanding of the combustion process. timtinker.com/ultralight-tent-stove-part-2/ timtinker.com/larger-ultralight-tent-stove/ Tim

Bucking frilliant!

Hi -- my question as a random arm chair pretend expert person: Why not leave the bottom of the vertical tube open so that ash falls out? That might also work as the cold air inlet. Then your fuel tube can be sealed, with a lid that has a spring mechanism to push the splinters as they burn up.

Very high quality work great craftsmanship and video is very interesting and informative. Good video to watch if you’re looking to build your self a rocket stove. Thanks for sharing mate! Tim in Michigan-usa

It looks to me like the beauty of the J style over your L style of stove is that it is self feeding. I like this video, you did a good job and provided a nice, simple explanation

I am wondering if you could make a combination woodstove and rocket stove so that it would burn for many hours ??? Would be interested in purchasing one of them from you Little Aussie Rockets if you would get back to me with a quote??? Thanks for the lesson on the ins and outs of this stove. Good Day Mate too.

Hah, I just recently had the exact same debate about the importance of "how" you burn fuel, air having crucial part in it.. Funny how so many think that only large energy corporations with their large ovens can burn things efficiently and cleanly.. especially energy companies are very resistant towards people making a sort mini powerplants to burn their own trashes and whatever fuel is available really, I wonder why is that.. :D

Wish you were in the US so I could buy one of your stoves. Nice job!

How much do u charge for one of your stoves? I live n USA.....also do u sell them non painted just with the shiny stainless look cause thats my favorite .... ,U have made a nice Rocket Stove with some of the best welds anyone could do,very professional quality welds and look

Nice welds

Love the subtitles that finish the sentences you don't. If you could make an app that did that in live conversation, you would put a bunch of therapists out of work!

We’re you going to explain the J type pros great welding never stop designing and testing ideas (and prices) love to follow your design’s wishing I still had my mig. How about one with an electric gen attached working off the outlet force

Hey man, thank you from the U.S. I got the idea to make one of these and your videos are in the top best of all the ones I've seen. Thanks from another diy guy.

I think your " improvements " are interesting. Thank you for explaining why you are making them the way you do.

Maybe expand on the principles of Gasification primary and secondary burners and why a highly insulated (2nd burner with added air feed) high temp combustion chamber for the wood gas enable complete combustion (heat generation) of the wood stock. ie Highly Efficient.

If I could lay a bead like that I would never ever paint over it, well done.

Most wood stoves exibit the aspects of a rocket stove when their first lit, especially when leaving the door slightly open as the wood starts to light off, and it starts to roar like a rocket,but its impractical to run a wood stove at that level, as the wood consumption would be very high as well as the heat output.

Your stoves look absolutely beautiful. I would make the chimney longer but i totally understand your explanation why you dont. Your metal looks so great it almost seems a sin to paint it

I like your innovative design, and the stove size is just right. Your on the right path, no worries dude.

Wow very impresive and also can be improved!! Thanks for sharing

I Built a rocket stove from some stove-pipe and elbows, no air-chamber, just feeding sticks as they disappeared. Sounded great and the thin metal glowed red sometimes.

Gorgeous welds!!!

At minute 0:58 he says "in my mind, that's the prettiest part." I have to agree. Those are beautiful welds.

Brilliant video thanks for sharing and teaching me new skills

I want a "U" shape so it can have a verticle feed and firr on one side, chimmey on other side. (Middle section should not be the main burning chamber.) Clean ash out with shop vac.

Whole point of using a J-tube, and with a grating under the burn area, is that the sticks will gravity-feed, instead of snuffing itself. the L-tube needs constant minding to feed the sticks into it. KEY to any rocket stove: The riser tube needs to be about double the length of the burn tube section. Here's what I want: A core-unit that will last as long as possible, that allows somewhat bigger sticks, like a Masonry mass stove does. A J-tube that is sturdy enough it lasts so it can be built into mass we build around it by our old fireplace.

Thanks for the video...how much? Or can you send me the dimensions? I don't own many tools and don't know how to weld

Can you use these indoors for heat . im in northern ca its cold and damp here in the winter. plenty of wood. can you increase the size of this to 5 inch sq tube 1/4 wall ?

i like the "V" fuel tray i would enlarge it to the back wall of the chimney and eventually made of steel mesh instead of solid V steel stock for better ventilation and holding the bigger embers over the air stream.

very nice design and weldworkk and thanks for sharing the concept/ theory of the rocketstove.

2021 and Steel is Expensive! People have to understand first the cost of materials, Labor and his tool's! So before you bash his prices, do research on your own to buy everything he has invested to make these!. Good Job Mate

VERY nice build quality. You could use them as axle stands when you aren't brewing a cuppa...! when I was 11 I now realise I made basically what was a rocket stove (or furnace actually it was that imposing!) The bottom section (horizontal) was made of bricks fastened with clay, the chimney was made from a 3 foot section of steel gate post about 4 x 3 inches.That thing was scary it roared so much and was red hot at times great big blue/orange flame shooting out the top I read somewhere about the designers of high performance steam trains, they uused a secondary burning chamber for better fuel efficiency. I think some top range woodburning stoves use the same principle, recirculate and burn the smoke

Does the air flow eventually become hampered by ash blocking the bottom vent. Wouldn't leaving the mouth open give it a longer burn time? And also a place for a excess ash to go? It's just that I have an old one that seems to work just fine. I can keep it burning for ages, which is important, as it gets cold where I am. It also has a few holes drilled into it on the sides at the bottom of the chimney which also helps on a long burn.

Are rocket stove better than cylindrical wood gas stove or are they the same when it comes to efficiency? I have got a cylindric one and it collects ashes with a tray you can remove while cooking , maybe you can figure out something similar

Wow - That weld bead at the beginning of the video looks awesome. Quality like that = long lasting rocket stove.

Great production techniques with the text commentary! Good pace, informative! Thanks!

What if you created a slightly modified version where instead of the L shape alone you added a sort of reservoir at the bottom - so extending the vertical part of the L shape below the horizontal part just enough to create a sort containment for the ash? I imagine you could extend the life of the fire this way but perhaps also if you do this and add a trap door you can let out the ash quickly and continue the burn...

Have you considered a removable-insertable ash pan that can emptied while the fire is ongoing?

Is it pissible to make a rocket stove with more than one chimney like a regular stove or a pizza oven connection or aome such?

The easiest way to make a rocket stove is, if you don't have a welding machine, to cut an enterance for wood, at the base of a tube - will resemble those built from bricks.

Good vid for rocket stove. Very simple and can use waste oil or anything made from flammable materials.

Very nice welding!

I am in Las Vegas, NV. With all of the construction there is illegal dumping. I went to a empty lot by me with only a lighter found 1-good(chipped a tunnel on one end for fuel) 2-broken cinder blocks used sand as a gasket. Was full steam ahead in 5 min. FOR FREE.

Did y'all design a slip in top with a grill and a port to vent the spent air up and out an exuast pipe? Or how anout a slip in thin Titianium dome that deliver's radiant heat with a side vent to exuast the spent air up and out a chimney pipe? So folk's could use it in door's? 😁👍

Love your channel! First time posting!Have you tried a wooden rocket stove inside a rocket stove! Game changer!

Nice explanation on stove function, I made a double burner rocket stove along with a hot plate attachment, it has a on/off flap if your cooking on one side, a air control door for flame control, and a slide door at bottom for ash also use for secondary air flow. But nice small stove and info thanks for sharing.

Good luck with your stove venture. Those welds looked great.

Being a welder myself I have to agree the first thing I noticed was the beads that you ran looks good to me

I think you are through the apprentice phase Sir. Others have noticed your welding skill as have I. Other people ask whether you sell these as well. I Sir wish I had plans and drawings so I may be able to attempt to duplicate those welds myself. I don't mind having to grind some I can't see and braille welding is the only option. Thank you.

The design of the air inlet at the bottom should be such that all the ash that forms due to burning gets pushed down through it due to gravity. An inclined intet or say upward looking air chamber through which the ash can slip and air can enter. And a mesh separating the burning chamber and the air inlet pipe.

Can the stove be open at the bottom for airflow and ash mitigation?

If you have a build up of ash it's an incomplete combustion. Your dimensions could be altered to make it burn more completely. The flow is the most important part.

You're excellent my man! Would a spring loaded fuel feeder work? Eg like a cord of ash pushed in automatically as it burns

Those cylinder ones @3:25 look cool too!!

Hey dude. Bead looks great. Keep developing. Loved the video. But since I'm in the U.S. the fire would shoot out the bottom. You know like the water swirling opposite!!!!😅!!!!! But seriously if you could make door / push rod combo that would seal well, could that deal with ash control and help stop / prolong burn time? Would it even be worth the time involved? Good luck

Beautiful tig work, mate!

Very interesting! Thanks for sharing. Have you got a stove primarily for heating vs cooking?

Good ideas

Your video is the best I’ve seen so far that explains how a rocket stove works. Does having the feed on an angle for gravity feed improve it?

Regular wood stove or fireplace with chimney does the same thing, or can if you adjust the flue, fuel, etc. correctly. Rocket stove does it with smaller pieces. It burns the same amount of wood more efficiently by mixing more completely with oxygen, so less of your combustible wood is turning to gas and then drifting out your chimney (smoke). So a good analogy how it burns less wood, a rocket stove is like fuel injected engine spraying gas in a fine mist into the combustion chamber to mix with oxygen vs. if you just had a big flaming puddle of gas in each cylinder.

That was the clearest, most concise explanation I've heard yet! Thank you.

Great welds. If you cut into the side of your pipe where the upright pice is ten to twenty m.m. below the wood insert pipe you have a place for your ash. Also if you put it on a cinder block it will be taller and a small metal can in cinder block is easy to remove and dump.

awesome weld!! I use to weld like that high school auto class

Thanks for the explanation, it will help me very much when I built my own👍🏽

really makes me think of bill mollison design principles...Righteous!!

Sorry to tell you but there are 4 parts and the old heat triangle is incorrect. Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." Take any of these four things away, and you will not have a fire or the fire will be extinguished.

Great explaination of rocket stove theory. I believe that a lot of the makers of rocket stoves could benefit from watching this as a refresher course. Thanks!

Maybe cut a square hole underneath and add a slide out tray to dump ash out occasionally. Could use 2 bits of small L bracket as guides and a bit of 2 mil steel as the tray.

Nice! I work as a welder, and i'm thinking of making my own rocket stove, just need some inspiration and ideas + use my own imagination. Want it to look futuristic.I'd have to say, that your welding is very good, looks absolutely perfect!

Do you think a mini mini rocket stove mass heater is feasible in a travel trailer??? My main concerns are WEIGHT and the gasses like c. Monoxide

Ran across this 4 years after posting. Just wondering if the feed chamber is at a 45° angle with a vent cut in the the lowest third to provide air would it feed itself?

An insulated rocket stove doesn't make the wood last longer, what it does as I understand it is that it reduces the inefficiently of an open fire it increases the efficiency by localizing the Heat and once the flu becomes hot enough it super Heat's the flue gas increasing the efficiency that much more that is when the smoke stops and when insulating a rocket stove you can put it inside of a modified propane tank for example insulating with either wood ash, or a mixture of (refractory cement with either vermiculite or a perlite blend) you can also during the construction of a rocket stove build in an ash dump clean out in the back of the stove.

trying to make one atm lol i to noticed the welding good job i wish mine were like that

can we still buy one of these? can it be turned into a mini rocket mass heater?

hi, why don't you use the design that burns the fumes as well?

hey, sir, I made one with stainless steel round tube is the best that can last you a lifetime the best way to make your stove is when you insolate it with 2" thick ceramic blanket that's what they use in furnace.I feed mine with twigs fat like my finger and within 5 minutes it starts getting red 20 minutes it gets so red it wants to burn up the fire inside it and when it gets that red you only use one or two-piece of twig to run it. normal steel cannot manage that high temperature it will not last along time after a few use it will star shell down if you need help I can.

Hi great video, if you angle you fuel intake downwards the wood will be gravity fed that way you can carry on with something else.

Still some improvements by closing off the fuel input area and putting an adjustable damper on the air feed. Too much air in-rush can actually cool the burn, which drops efficiency. (Idea to burn the secondary gases produced by burning the primary fuel.) Not exactly about maximizing airflow as it is about controlling it. But I understand this is cheap and simple, so it is what it is.

The J style self feeds the fuel. The L you must continue to push fuel in.