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  1. #1
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    Default First homemade cone / wind screen

    Question. Did I mess up my first mini cone? Despite having watched video tutorials on making one of these, I decided that the top row of holes was too high and wouldn't be of benefit to the project...so I changed the design at the last moment.

    Unfortunately, when I used it the first time, the fire didn't seem to be burning nearly as well as it did without the cone...so I went back and added the top row of holes. Now while burn times are improved, the middle row of holes has flames blowing out of them as times and I suspect that they serve little purpose.

    Before I cut another cone, I am seeking input. Additionally, are 3/8" holes too big?

    Thanks in advance.

  2. #2
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    Eliminate the middle holes.

  3. #3
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    What burner do you have under there? In a confined space, typically smaller burners are used to prevent overheating and blowhole.
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    Quote Originally Posted by Kaptainkriz View Post
    What burner do you have under there? In a confined space, typically smaller burners are used to prevent overheating and blowhole.
    Another thing would be incomplete combustion. Higher temperatures in a cone and increase fuel evaporation rate, if it doesn't have the oxygen to burn this extra fuel then it's going to just leave some unburnt and it will exit the cone.

  5. #5
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    Ok, Ok....leave the holes in

  6. #6
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    Quote Originally Posted by Kaptainkriz View Post
    What burner do you have under there? In a confined space, typically smaller burners are used to prevent overheating and blowhole.
    That's a great question...I wish I had a good answer. Let's call it the modified-modified stove.

  7. #7
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    Should I try to plug the extra holes with the material I popped out. Kidding.
    Quote Originally Posted by zelph View Post
    Ok, Ok....leave the holes in

  8. #8
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    Just to add to the mix/trial.
    Cover the middles holes, run another trial.
    Add more holes to the bottom or top as needed.
    Keep the same burner, as a constant.
    Last edited by Onsen; 01-28-2019 at 22:14.

  9. #9
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    Quote Originally Posted by jgillam View Post
    That's a great question...I wish I had a good answer. Let's call it the modified-modified stove.
    OK, but do you have a photo of the stove itself?

    That looks like a small cup (450 or 550ml?) and such a setup might work better with a smaller burner. Flames are likely shooting out because the burner output is too high for this system.

    I can see something thru the lower cone holes, which looks like the burner, and it looks comparatively large. Also, it might be constricting air getting into the bottom holes. Those flames on the outside are fuel that didn't burn on the inside because there was too much fuel vapor in the chamber for the amount of oxygen being drawn in.
    Last edited by cmoulder; 01-29-2019 at 17:18.

  10. #10
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    Looking good!
    Last edited by zelph; 01-29-2019 at 21:19.

  11. #11
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    Start afresh...it's starting to look like a cheese grater.
    Once you dial it in to suit your alchy stove, you'll forget about all those experimental trials & tribulations.

    My initial attempts weren't half as good looking as yours.

    Its a balancing act between intake size - exhaust size - pot gap above stove.
    Last edited by Onsen; 01-29-2019 at 20:29.
    enough talking......let's get walking !

  12. #12

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    Make it taller too.
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  13. #13

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    I think that the most efficient cone systems support the pot by its top rim. This is true of the first gen Caldera Cones; not true of the later sidewinder designs (which IMO may be less efficient, but easier to store the cone in your pot). You might try the first gen type of cone (all the way or most of the way to the top rim). A silicone band on the pot can support a cone that goes part way up. You will still need air inlets at the bottom and air outlets at the top.
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