Step 8: Fueling and Firing

One of the best things about the Rocket Grill is how it's fueled.

No longer do I have to purchase fossil-fuels to cook my backyard fare!

Because of the amount of air that flows through the grill, almost any bio-fuel burns great in it. This one is really designed for twigs and sticks.

After every wind-storm, all of my neighbor's trees shed their sticks downwind into my yard. Before, I would grumble at the yard-work of picking up all those sticks and moving them back to the brush pile. Now, I instead gather them up looking forward to burgers, corn-on-the-cob, or whatever I am going to cook up next.

To start the grill, I just put a little bit of tinder (usually a bit of newspaper) and a few twigs onto the far end of the Fuel/Air Plate. I light it with a match or cigarette lighter, and then just feed in a few more twigs. After that, a fair amount of sticks, firewood, or other fuel can be loaded on the top side of the fuel plate.

The fire is very simple to light and starts right up.

Even EXTRA LONG fuel can go right in. Just slide it a little farther in every once in a while. The chimney effect makes all the heat goes up the vertical tube. No smoke or fire comes out the feeder tube.

I am right-handed, so I designed the grill so that the feeder tube comes out on an angle to the right. That way, it is easy for me to fuel, but I don't hit my shin on it.

Since pots sit down INSIDE the grill when boiling, the heat transfer of the fire to the pot is very good. The heat hits not just the bottom of the pot, but travels up the sides as well. This means you get a boil going faster, while using less fuel.

I also used my grill in a rain storm a while back. My concern was rain running down the lid and then inside the grill. It wasn't an issue - any rain hitting the lid simply vaporized or sizzled right off!
<p>Inspirational, and since I love welding, I'm very sorry I had the water heater replacement guys taken my old heater away! The fact that you can use any bio-matter is the really cool part. I have to buy special pellets or wood for my Traefer smoker / bbq-er.</p>
<p>awesome instructable, i cannot wait to build one. i noticed you said that when you grille it get more hotter in centre, is there a place(room) to put ceramic or some type of brick or coal that is used in gas grill to distribute the heat more evenly</p>
<p>I've done some modeling how to add air preheater to your rocket stove (but for flat pan on top):</p><p><a href="https://drive.google.com/file/d/0B0u4WeMjO894QmoxUkstazIwWVU/view?usp=sharing" rel="nofollow">https://drive.google.com/file/d/0B0u4WeMjO894QmoxU...</a></p><p><a href="https://drive.google.com/file/d/0B0u4WeMjO894eTRsLWdaX0packU/view?usp=sharing" rel="nofollow">https://drive.google.com/file/d/0B0u4WeMjO894eTRsL...</a></p><p>and cutted STL 3D model for reference:</p><p>https://drive.google.com/file/d/0B0u4WeMjO894dmdYVE85RGlNTlU/view?usp=sharing</p>
<p>Note small gap between pan bottom (flat for demo) and edge of innet rocket stove tube, and holes drilled in it's wall. Heat interchange plates will be hold pot upper, and trasfer heat to flowing air. All construction covered by larger outer tube with length smaller then inner tube. Air will go from bottom upwards.</p>
it'd be interesting to brew on one of these, boiling 5+ gallons always eats up a lot of propane.
<p>In any case, the idea of the cooking pan within the heat preserving housing is very good</p>
<p>I'm imressed by your post, and make Instractable itself: <a href="https://www.instructables.com/id/Samara-Gasifier-Backyard-Cooking-Stove/" rel="nofollow">https://www.instructables.com/id/Samara-Gasifier-Ba...</a></p><p>What do you think about adding air preheating into your stove ?</p>
<p>I like idea of gasifier stoves to put extra air to top of burning zone, preheated by flowing along walls of main burner. I have some idea to expand your design by extra tube goes around your burning column until your expand (cooking pot). Heated air can be feeded at top of column by holes, making smoke more clear and increasing heat power. In my case there is no visibe smoke at all, or (in case of gummy woodы like apple or especially cherry) smoke is almost white and without soot.</p>
<p>Expanding heating surface with heat transfer plates like here https://ligra.ru/Powerprofile/Ohladiteli1.jpg can make air flow more powerful and increase its injecting temperature.</p>
<p>Instead of fabricating what is basically a 6'' wye, do you think a cast iron 6'' wye from a plumbing wholesaler would work, or a6'' sheet metal wye in the heaviest gage available with a 6'' storm collar as the stabilising base would do the trick as both branches take off at 45 degrees.I realise that the 6'' sm wye would not be as heavy duty as your excellent design. This might save a lot of welding--just a thought.</p>
<p>I really like your stove. I'm working on one now. I don't like to put a hot lid on the ground so I am putting a hook on the underside of the lid so I'm able to hang the lid from the side of the stove. For getting rid of the ash, I'm thinking a one inch hole in the side of the bottom of the stove pipe. Just pour water down the stove and let it wash out, or just use a leaf blower to get rid of the dry ash. For a diffuser plate, I cut one inch tabs around the edge of a piece of round sheet metal and bent them like small fan blades. As the heat rises, it spreads and starts a whirlwind inside the stove body. Thank you for a great post. </p>
<p>Not to be off topic or anything, but just for a second there, it sort of reminded me of a piss tube in Nam, they were placed every once in awhile on most bases. Many had a sort of built up shield so you were given just a bit of privacy, however some were right out there in the open. I usually waited for one with some sort of shield. Modesty I guess.</p>
<p>Amazing. I've seen done for heat sources and the like but never a grill. I was looking at the heat output and that cherry red glow. It got me to thinking how this could be applied to the furnace design for a smithy forge. No bellows nor powered air supply needed - a smoke free rocket forge!</p>
<p>Very cool grill, I'm busy making a &quot;Franken-webber&quot; pizza oven and thought a rocket stove beneath would heat up the oven in no time. I made the rocket portion this morning and fired it up, got it sounding like a rocket in no time. </p>
Nice job.. I've built small rocket stoves but never thought of doing one this size. I'm glad I saw this because I have lots of stainless pipe in all sizes and I'm gonna start on one this weekend. I'll post pics and I have a few ideas on making it easier to clean. Also I have a great idea on the diffuser..pics coming soon..great job man..thanks for the instructable
<p>Damn, you're lucky, I wish I had some stainless steel lying around. I made mine out of scraps of steel I had lying around, looks a bit like Frankenstein's monster. Works like a beast though. </p>
If you have the material and welding ability to work with stainless steel, your project should turn out GORGEOUS. Many of my projects are either &quot;rat-rod&quot; or &quot;steam-punk&quot;, but it's great to see what people can do with different materials and skill levels!
<p>Have you considered cutting and sleeving the vertical tube near the base to ease ash removal? You could leave it as a lift off or put some set screws to secure it, like a Christmas tree base.</p><p>Great project!</p>
I like your grill a lot i'm going to make one but I'm going to use high temperature grill <br>paint just make it look better
<p>Let me know how the grill paint works out for you. Please share a photo when you finish!</p>
<p>I built one a few years back. I've never been able to get it to work though. My buddy who did most of the welding said he had it working but that was before adding the tank to the top. My pipe is a bit smaller and I actually used an old charcoal grill on top. Recently messing with it has come to mind as it's time to make it work or take it to the scrap yard.........</p>
<p>I love It! A steam-punk grill!!</p><p>Great job.</p>
<p>Just welded mine together. Still need to finish the lid</p>
<p>I like the base!</p>
<p>It is sweet, very heavy. it won't fall over but makes it a bit of a pain to move. gotta love trash reclaimed from work. This was all made from things that were either being thrown away, or recycled. didn't buy a thing, just cost me some labor and my grandpa made all the welds pretty for me.</p>
Neat. Not sure I understand the process of burning completely. Is wood fed from the top (is there a hole on the inside), or just through the feeder tube? <br> <br>Does the grill draught through the hole in the bottom (implement disk) &amp; out the feeder tube, or are other vents involved?
<p>Both wood AND air come in through the side tube. It is divided in half with a plate. The wood goes inside the side tube on TOP of the divider and air is drafted in through the same tube on the BOTTOM of the divider. The divider has air holes in the end of it for the air to get up through the wood (and the fire.)</p>
<p>Like the BBQ .Just a thought about Ash Clean up. Attached is something I made to clean out pipe going to my furnace. It is basically just PVC pipe reducers and then a valve with a quick connect to attach to an air line from your compressor. It is attached to the pipe with a coupler with 2 worm drive bands. I am not saying the person cleaning the ash is not going to get dirty but it still would be easier than trying to scoop out ash down that long pipe. </p>
Great JOB !!!! <br>I will make one soon <br>Thanks
That's really cool! Excellent the idea of grilling over wood, <br> <br>Could you just make some holes in the bottom and make the whole input pipe into a fuel holder ? So you could remove the ashes through the air holes, and more fuel would fit in.
The only thing that I could think of for why NOT to do that is that air-holes through the bottom might be a good place for hot coals to escape through or that perhaps they could easily get clogged with coals or ash.<br><br>So far, the divider plate is simple and works well. If anyone makes a variation of this project with the suggestion made by yummyribs, please post a photo and let us all know how it turned out!
can you up load video of you grill in action some ware please
Excellent work! I am inspired. <br> <br>I was curious...what did you do with the rest of the water tank? I thought it would make a good insulated base (fill it with vermiculite) between the grill and the disk. Of course, that would make the thing quite a bit heavier. <br> <br>Another idea for emptying the ashes would be to use a shop vac...if you have one. Of course, make sure the ashes are cold first! <br> <br>I am going to start looking for a used water tank.
this is fantastic. thank you for the inspiration! <br>
This is just too awesome!!!!!!! <br>Before reading this, I had never heard of a rocket stove.... <br>This is something that I would like to learn(welding/metal work) so that I could make a similar project. <br> <br>TY for sharing Sir!! 8)
bennelson!<br>Thank you very much for your ideas and your taste in expressing yourself through your words and your creations.<br>Enjoy your cobs!
Fantastic! Love the simplicity and effectiveness.
Where might I source the thick-walled pipe you used? I've been looking all over but just can't seem to locate 4-5 inch pipe with a thick enough wall. I'd like to build a very-long-life stove for our conservatory.
This was salvaged metal that was at a friend's house. I believe it was well casing.<br>Try looking at a metal salvage yard sometime, they are fun places to visit.<br><br>Since this project doesn't require new materials, the costs to build can be kept low.
Hmm i have always wanted to weld<br><br>for grilling certain woods are better than others for southern or mexican if possible use mesquite wood for grilling mm<br>although it might not work because there is little to no smoke to smoke da steak
What causes the &quot;rocket sound&quot; you referred to? Is that from the air drawn in from the bottom? If so, that could probably be mitigated by the airflow design.<br><br>A note of caution: I have seen many older water tanks of this type that are galvanized, which will emit toxic gases when heated, so try and make sure your materials are not plated; the galvanizing can be removed safely using different methods, but the effort is hardly worth it, since grinding it away also produces toxic airborne particles and acid treatments are hazardous in their own right.<br><br>Alternates to water tanks are decommissioned welding gas tanks, which come in either short, wide tanks or the more common thin style (making a smaller grill for a really compact outfit).<br>
So, I would feel more comfortable if someone confirmed this, but I'm pretty sure galvanized steal will have the galvanized part burn off after the first hot temperature. That's why I tend not to worry about the fact things do release toxic gases, because the first time I have a coffee can stove, grocery cart (galvanized steel), etc, I just burn it off in a very hot fire that I shortly step away from after starting up.
Even welding galvanized steel is problematic. It needs to be done in a well ventilated area, with a fan set up to carry welding fumes away from the operator. I'd certainly not use this grill for cooking food until all the the zinc has been burned away.
Yes. It burns off, or is reduced to oxide VERY quickly once heated. Stand well away, &quot;zinc fume fever&quot; is a work-related illness and is reportable !<br><br>Steve
The risks are mixed, but the simple answer is to not use galvanized material; if you wish to have a comprehensive view of the subject, I just found the following PDF available from a quick Google search for welding galvanized metal:<br><br>http://www.sperkoengineering.com/html/articles/WeldingGalvanized.pdf
There were not galvanized metals here. It was all bare steel, other than the water pressure tank, which was only painted.<br><br>The stove makes a pretty cool sound when it's really running full tilt. It's because of how much are naturally drafts through it. I wouldn't change that at all. I really like the way it sounds and how the air and fire travel through it.
Great instructable. This is a really great idea, kills two birds with one stone. I think I will have to make one of my own here soon. Thanks.
A great grill. How easy is it too get the ash out of the bottom, and what do you do with the ash once you get it out? <br> <br>It really is a major rocket stove. LOL
Originally, the base-plate had a hole it in.<br><br>When I would lift up the grill, the ash would fall right out the bottom. It also left nice little burned holes in my lawn! So, I welded that spot shut.<br><br>As it is right now, I just turn the grill upside down. It is lighter than it looks (without the side tables and lid) and I just dump it out into a steel bucket.<br><br>It doesn't make that much ash. One advantage of using fuel more efficiently is that there's less waste in the end.<br><br>I put some of the ash in my compost pile and the rest spread out in my brush pile.<br><br>I've played around with the idea of cutting a &quot;door into the bottom-back of the grill base, and hinging it as a place for ash-removal, but really, it's just so easy to tip the grill over to dump it out when I need to.<br><br>An ash clean-out would be a nice feature for a larger or more permanently mounted version of this project.
I don't know about the original one, but mine you just lift the stove off the little pile left after the burn. The ash makes a good fertiliser

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Bio: Ordinary guy with no special skills, just trying to change the world one backyard invention at a time. See more at: http://300mpg.org/ On ... More »
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