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Rocket Stoves

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(@anonymous)
Illustrious Member
Joined: 15 years ago
Posts: 11254
Topic starter  

I saw a video on You Tube that amazed me and I'm a machinist/welder/fabricator by trade. They used this small stove and with only a fistful of kindling, the fella cooks 4 burger in a frying pan. I started to research it and discovered that there are tons of folks with their own concept designs for every aspect. The principle of the stove is simple. It's called a rocket stove basically because it roars like a fire does when you blow on it. It requires no electricity as this is all accomplished due to the way it breaths. Most good designs are heavy units because they contain firebrick mortor to help insulate the burn area as the hotter the burn, the cleaner and more complete= less ash. Lastly, a good design captures as much heat thru an incorporated heat exchanger before it goes out the chimney. Check this out yourself as I've lost days just studying folks designs and concepts.

Here is one version I made

Here is my second design so far

And this is the reason why I haven't finished either of them stoves...



   
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(@goldie)
Honorable Member
Joined: 13 years ago
Posts: 663
 

Since you are spending time researching rocket stoves, you might like
to purchase one already made . Or get ideas from them.

I bought an EcoZoom brand rocket stove already made from here.
http://www.wildcoasttents.com/EcoZoom.php
manuf: http://www.ecozoomstove.com/
They have light and heavy models. I bought the heavy ZOOM model for use at my home .

Another brand of this same type is the StoveTec rocket stove.
http://www.stovetec.net
http://www.stovetec.ca
( I believe they are made in the same factory as ecozoom )

Another factory made brand is the SilverFire brand, Super Dragon model, or Survivor model
http://www.readyshop.ca/ ( look under gear, then outdoor cooking )
manuf: http://www.silverfire.us/
This brand has something under ovens also.

All of these require just a few sticks .

Interesting information here: http://www.rocketstove.org/
with some design principles pdf , etc



   
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cernunnos5
(@cernunnos5)
Noble Member
Joined: 15 years ago
Posts: 1230
 

Here is mine doing maple syrop


I have a Tactical Harness and I have a Tool Belt. The Tool Belt is more Useful.


   
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 ndn
(@ndn)
Trusted Member
Joined: 12 years ago
Posts: 90
 

i made one outa old bricks they are amazing heats up quick and les fuel ,you can cook right away not like camp fire were you have to wait till coals or may be to hot to cook near ,i wana try the 5 gallon bucket and cement


Thank you

NDN


   
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(@anonymous)
Illustrious Member
Joined: 15 years ago
Posts: 11254
Topic starter  

Well I finally decide to finish the small rocket stove. The thing that put both of them on hold all this time was trying to locate some refractory cement. Seems many places folks tell me I should go to are always dead ends. I eventually got my hands on just enough to do the small stove at least.

You see, this special cement doesn't just protect the metal from distortion due to excessive heat but also helps the wood to burn hotter and thus drastically reduces the ash too. Now many rockets stoves are open on top where you cook. This design is good for outdoor cooking but can't be used well as a heat source because of the lack of an exhaust.

So what can be done with the basic concept is to put a hood over it. You then redirect the exhaust downward before exhausting out which creates an inversion. Now the stove becomes a heat exchanger too as the hot gases heat this space between the stove and hood before exhausting. Some folks have captured so much of the heat that the external chimney temperature reads around 100 degrees Fahrenheit instead of say 600 degrees. That means you need a lot less wood to attain the same temperature as a regular stove work produce.

Here's an idea as to how this inversion process works



   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
Topic starter  

So now you can see the principle behind this little, here are a couple of pics of my finished stove. It was all made from scrap kicking around so the investment was only time as even the cement was a gift from a friend.

1. The bolt legs are removable for smaller storage while also allowing for adjustment for leveling so you don't spill whats on top.

2. It's elevated 5" off the ground so that it burn whats below it.

3. I used 3" insulated pellet stove pipe so that it would be safe to use in a standard tent, RV or ice fishing shack.

3. The thermometer is off a broken bar-b-que and lets you know when you can touch it ...or not!

4. The handle allows you to carry it easier as this sucker is 50 lbs....not something for backpacking it seems 😀

5. The flattop is added for cooking or heating coffee.

6. I tilted the intake pipe somewhat to ensure that no sticks fall outwards easily and maybe even self feed as they burn

I will fire this puppy up tomorrow to see how it's design fairs. I can't see it failing, but will let you know more soon.



   
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peppercorn
(@peppercorn)
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Joined: 12 years ago
Posts: 2117
 

I did not realize that the pics in your first post were vids. I clicked on your bike for a closer look and got to see your build. That's a interesting project...a lot of work. I hope none of it vibrates off while going down the road 😉 .


Give a man a gun, and he can rob a bank. Give a man a bank, and he can rob the world.


   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
Topic starter  

I did not realize that the pics in your first post were vids. I clicked on your bike for a closer look and got to see your build. That's a interesting project...a lot of work. I hope none of it vibrates off while going down the road 😉 .

No Fears... it's all steel 🙂

It's come a ways since then. It took me 2 weeks alone to design the tank and make it suite the bike while still achieving 5 gallon minimum. In the end, the frame will be an off white to look like bones and the tank and fenders will be painted to look like their made of wood. It's my touring chopper....That's why the windshield,floorboards, big tank and provides proper posture built for long hauls. It has air over hydraulic frame suspension and is just long enough to look like a chopper but still handle well. It's one of those projects that seem to take years to complete, mainly due to money! Now the air brushed paint job is gonna be costly too. 😕

But now you never said anything about the rocket stove...what do you think? I know I can only feed it sticks and kindling, but that's all that is required to heat small spaces. Did you use refractory cement in your design? If so, where did you get it?



   
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peppercorn
(@peppercorn)
Noble Member
Joined: 12 years ago
Posts: 2117
 

But now you never said anything about the rocket stove...what do you think? I know I can only feed it sticks and kindling, but that's all that is required to heat small spaces. Did you use refractory cement in your design? If so, where did you get it?

Like the bike, you do some real good work, it looks like you could fabricate most anything in that shop, I am confused by your last questions, I have never designed a rocket stove so have not needed refractory cement. You must have me confused with someone else.


Give a man a gun, and he can rob a bank. Give a man a bank, and he can rob the world.


   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
Topic starter  

But now you never said anything about the rocket stove...what do you think? I know I can only feed it sticks and kindling, but that's all that is required to heat small spaces. Did you use refractory cement in your design? If so, where did you get it?

Like the bike, you do some real good work, it looks like you could fabricate most anything in that shop, I am confused by your last questions, I have never designed a rocket stove so have not needed refractory cement. You must have me confused with someone else.

Sorry Peppercorn. Indeed mixed you up with C5 's comments above with his above version for cooking maple syrup. Yes, seems I once made helicopters here too, hence the name "Choppers R Us". 😀 And we did it all out of this shop seen in behind them birds!

Can't figure why nobody ever called to make a dumb TV show bout some redneck bikers who actually made both helicopters and motorcycle choppers in a small shop in northern Canada..... maybe I could yell and scream at my sons screwing crap up all day for entertainments sake too! Still nobody called 😳 Seems Canadian's want to watch hockey instead 😎



   
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peppercorn
(@peppercorn)
Noble Member
Joined: 12 years ago
Posts: 2117
 

I am speechless.

Wait...no I am not...I see the word experimental on one of those, not something I want to see on helicopter I would be getting in.


Give a man a gun, and he can rob a bank. Give a man a bank, and he can rob the world.


   
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(@helicopilot)
Member Moderator
Joined: 13 years ago
Posts: 1487
 

Well.... I always said you'd never see me in a piston-driven helicopter... But if you built it, I probably would ;). Nice looking machines buddy!



   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
Topic starter  

😆 Yes, they are classified as experimental aircraft and so must have the word "experimental " pasted on them as a warning by law. In fact the Safari is probably the safest model in homebuilt class because we use driveshaft (no belts) and use a certified Llycomming aircraft engine. And likely Helicopilot's comment about not getting into a piston engine over a turbine is a common one amongst commercial pilots today. That is because most of the piston helicopters flying were made in or before 1960. Many folks don't realize many of the small aircraft flying around in Canada are also that old too.

Maybe It is just because I have worked on so many old aircraft that I don't even really like flying.... 😆 But I'm a builder, so I build. At least these I build are new and therefore not suffering from metal fatigue. 😎

Here's a clip of our chief pilot doing tricks to at least show the helicopters agility https://www.youtube.com/watch?v=bZfX1TOWhPs



   
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(@helicopilot)
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Joined: 13 years ago
Posts: 1487
 

And likely Helicopilot's comment about not getting into a piston engine over a turbine is a common one amongst commercial pilots today. That is because most of the piston helicopters flying were made in or before 1960.

Nah, it's just that most of them look more like the toys that we used to have, you know, the one where you twisted the rubber band and it made the rotor turn?

It's also a matter of perspective between an 8000# empty weight helo I'm used to and these ones... Like driving a Suburban everyday and then sitting in a Suzuki Swift (or whatever tiny cars they make these days...)



   
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peppercorn
(@peppercorn)
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Joined: 12 years ago
Posts: 2117
 

hey. are you dissing the swift? I have a mechanic friend, and back in 92 or so I asked him what car should I buy, that would cost me the least to buy, operate, and repair. He told me to buy the swift, said he regularly seen them coming in his shop with 300, 400 thousand k and still going strong.
I did, walked into the dealers and slapped down 7000.00 for a 3 cylinder swift. I drove the snot out of that car, I remember hauling so much steel pipe sticking out the back hatch that when I drove home down gravel roads the front wheels lifted.
I parked it up after 5 years with maybe 250k on it. only costs were a timing belt and a brake job, new plug wires. next to nothing. After sitting for years I fired it up in 2008 and drove it to a shop I have in Nisku, thinking I was going to pull the engine, because I wanted to use it in a ultra lite (challenger 2 copy) I was going to build.
Plans change and it sat there until last week, when get this, with the same gas it had from 2008 it fired right up! I drove it back home. Its something like 23-24 years old and runs as well as the day I drove it off the lot. That thing cost nothing in fuel, it will run off the fumes from a gas soaked rag, a 5 speed standard that was so smooth I didn't use the clutch petal half the time.
I don't know when that thing was designed I will guess 87-88 just a wag, and I remember recording the fuel millage, as I kept track of things back then and while I know longer can say for sure as its been to long but 58, 59 + kilometers per gallon comes to mind. I think it had a fuel injected carb. I now have parked it up by a out building where it will sit, until gas prices triple. Best car ever!!!


Give a man a gun, and he can rob a bank. Give a man a bank, and he can rob the world.


   
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