Maybe this is common knowledge, but I figured I'd post a quick how to.
Feel free to contact the mods to have it deleted if you like.
Anyway, Here is how I build a beer (or soda) can alcohol stove that performs pretty well, being able to heat a pint of water in just a few minutes.
You'll need:
- 2 beer or soda cans of the same manufacturer
- a scrap piece of 2x4
- Thumbtack
- Utility knife blade
- A Penny
- A Nail (I used a 12d this time... What I had handy)
- about a 4-5 inch piece of aluminum foil
- A hammer, rock or some other bashing device
- A can of dry gas. Other fuels will work, try them. This is what I had on hand.
- Some 400 grit sandpaper helps, but with patience, isn't necessary.
Start by drinking two beers or sodas (No, wait, use empties from last night since you want to be sober for the cutting of the cans.).
Lay the razor blade on top of the 2x4 so you are cutting the bottom of the can at a height of 1 3/4 inches. Turn the can slowly and steadily to cut all the way through the can.
Once both cans are cut, slice a small wedge out of the remains. This will be used as a 'shim' to help join the top and bottom section.
Here's where the sandpaper comes in... Carefully (as you'll have very sharp edges on the two pieces or can) sand the inside of one can and the outside of the other. This will help to remove any burrs and will also flare the lips of the cans in opposite directions.
This is the tricky part. Insert one can into the other. When you first try this you will swear a lot and say it can't be done. Use the 'shim' to help coax the two together. the top and bottom section have to be <i>almost</i> flat to accomplish this. IT CAN BE DONE (no pun intended).
Once the inner is seated inside the outer can, simply push the two together until fully seated.
Take your nail and punch a hole in the center of what is now the "top". This will be the inside can. Use the sandpaper to remove any burrs from the sharp edge of the outside can if you like.
The thumbtack is now used to poke holes in the 'burner surface'. I put 4 holes in the uppermost rim (i.e. what the can rests on as it was sitting on your coffee table) at the 12, 3, 6, and 9 o'clock positions. Now, on the inside of the rim, 4 more holes between each of the holes you just poked. Finally, a series of 8 holes around the outside of the rim spaced between each of the already poked holes. When finished, you should have 16 holes in the burner surface of your stove. When making these holes, it is best to start small and gradually work them bigger by trial and error.
Fold your tinfoil into a rough square. Center a tuna can on this square and fold up the sides of the foil and sort of 'mold' the foil to the shape of the can. Or, just open the tuna can and eat it. Wash the can and dry it. This will become the base / preheater for your stove.
Place the stove in the center of the base and pour about 1 oz of drygas into the hole poked with the nail. Set the penny on top of the burner as to cover the hole. A self tapping screw can also be used for this, but I think pennies are a bit easier to come by... I have also used the gelled alcohol used in fondue pots and am going to try hand sanitizer as this is mostly alcohol.
Pour a 'splash' of alcohol into the base.
Light with a bic or match and keep the stove out of the wind. A windscreen is very helpful for this.
Within about 30 seconds or so, the base alcohol will heat the stove and begin to vaporize the alcohol contained within. Since the penny is covering the large hole, the alcohol vapors are forced out the small thumbtack burner holes and ignited. Now, the stove is self-perpetuating and will continue to vaporize, eject and burn the alcohol. Burn time on 1 oz of drygas is like 6-7 minutes. I'll get back to you on boil times and capacities...
Arrange tent stakes, EMPTY mags, or whatever you have available to support your cooking vessel and make your self some warm water. I have been able to boil with one of these, but the water has to be not almost freezing to begin with... And, not a lot of it. This stove in no way compares to an MSR Pocket Rocket or a Coleman White Gas Stove, but in a pinch, it will work for a small amount of ambient heat or to heat water for cooking.
Bottom line, beer or soda cans can be found anywhere. With a little patience, and minimal tools, you CAN (again, no pun intended) heat water field expediently.
Please let me know if I left anything unexplained or you have a question. I have made several of these little stoves and would be more than happy to help!!
Thanks for looking.
Drew