Alcohol Stove Final Report Part 1

Introduction


I created an alcohol backpacking stove following a minimalist aesthetic. The stove uses denatured alcohol for fuel, features legs which function as a built in pot holder, and has a “simmer ring” to control temperature.

Concept


 

stovesidepressurestoveJetsLit

The general concept of how this style of stove works is illustrated well by these two images. The dark blue symbolizes the liquid denatured alcohol which is poured into the center chamber of the stove. Once the stove is lit (lightest blue symbolizing flame), the heat begins vaporizing the alcohol which pressurizes inside an interior chamber, shown as the lighter blue. The pressurized alcohol vapor exits the stove at the top through jet holes and is ignited by the central flame.

Process


Initially I had the intent to create a stove with a built in pot stand, some sort of variable temperature control and an additional fuel reservoir. To begin I started by drawing some rough sketches of some ideas I had for possible stoves and leg designs. As the project progressed I decided to only focus on the built in pot stand and the temperature control.IMG_0601

After doing some sketches to narrow down my goals, I started making prototype stoves to find a style I thought would fit the minimalist aesthetic well. The first prototype I made was very crude but proved to be an excellent learning experience as it showed me how much precision would be needed to reach my goals. I also made a few prototype leg designs out of wire I had laying around. IMG_0474

The second prototype stove I made was closer to what I was aiming for, but still rough and not exactly what I wanted stylistically. IMG_0501

I decided the style of the third prototype I made fit my aesthetic well. I chose to use the style of the third prototype as the model for my final product. By the time I made this third prototype my precision and techniques were much more refined.IMG_0534

The final design I chose to base my final product on uses an outer reservoir and an interior piece with ridges (called capillaries) to create small interior chambers for the alcohol vapor to form in.

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The Final Product


In the final design I bent steel rod to make legs which I attached to the side of the stove with brackets. The brackets were made from pieces of aluminum cut from the sides of cans and then pressed into shape. Inside each bracket is a piece of aluminum tubing which is what holds the leg and allows for free rotation. The brackets are secured to the outside of the stove using JB Weld. Additionally, I made a “simmer ring” from the very top of a Redbull can which works as a means of temperature control. The ring rests on top of the stove to block off the jet holes so there is a smaller flame, allowing for cooking at a lower temperature.
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Tools


In order to cut cans at exact heights over and over I made incremental blocks which allowed me to secure a razor blade for precision cutting.
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I found that using steel wool was the best way to remove the coating on cans and polish them. Polishing the cans was actually a challenging aspect of this project due to the fact that many cans are anodized so solvents do nothing to remove the coating. Sandpaper also worked well, but it was a lot more work compared to steel wool.

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The tools I used the most are shown below. I used pliers to bend the steel rod to make the legs, a hand drill and tiny drill bits to make the jet holes and a circle cutter to cut the top and bottom out of cans.
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I carved a notch into a piece of wood to make a die for the leg brackets. To make the brackets I put a square of aluminum over the notch, held a piece of rod over the top and hammered it to form the bracket to the correct shape.

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Costs


Redbull Cans: $7

Steel Rod: $7

Aluminum Tubing: $7

Steel Wool: $4

Denatured Alcohol: $8

Razor Blades: $7

Circle Cutter: $10

Hand Drill: $6

Drill Bits: $6

JB Weld: $6

Foam Sanding Blocks: $9

Total: $77

 

(Originally my estimated cost was $48, so I did go over my budget but not by a huge amount. )

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2 Comments. Leave new

curious to know more about how the configuration of the capillaries changes the burn characteristics.
Did you do any tests for burn time? time to boil a cup of water?

Reply
Kevin Martin
May 4, 2016 5:18 pm

This is such a creative project! I’ve never really seen denatured alcohol stoves before, so this was fascinating to watch over the past semester. You do a great job of explaining the background and reaction of your stove, as well as showing the physical and aesthetic creation of it!

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