Building a Rocket Stove: Step Two
Draw a circle on one of the small cans (can #1) that matches the one in the large can and cut it out. You’re going to put this small can inside the larger one – another small can will fit snuggly through both circles. To make sure the circles are the correct height, insert can #1 into the large can and trace the circle you’ve already cut in the larger can onto can #1.
Test the size of the newly-cut hole by inserting the top of a small can into it. If it doesn’t fit, cut the hole a bit larger, just as you did on the big can. Getting the right size on the smaller can is a tedious process, so be prepared to spend some time snipping!
Building a Rocket Stove: Step Three
Cut the bottom off of one of the small cans (can #2) that haven’t been used yet. You can either use a can opener or the tin snips, depending on if the bottom of the can is flat or rounded. You won’t need this bottom piece of the can, so you can discard it.
Set can #1 inside the large can and line up the hole on the smaller can with the one on the large can.
Insert can #2 into both holes. If you had to use the tin snips to get the bottom off of the can, then be sure to put the rough edge in first. This will prevent you from cutting yourself on the edge when feeding wood into the stove later.
Building a Rocket Stove Chimney: Step Four:
Take another small can (can #3) and cut the bottom off of it, as well as slitting it vertically from top to bottom. This is going to be the chimney on the stove.
Discard the bottom and put the slit can inside can #1 that is standing up within the large can. If you can’t get it to fit snugly inside can #1, then use the tin snips to cut the thicker edge off of the bottom of the can (if you used a can opener to take off the bottom). This should make it easier for can #3 to fit down inside of can #1. The chimney should also be lower than the top of the large can. If it sticks up past the top of the can, then you’ll need to measure and trim the bottom of can #1 until it is about a quarter inch below the top of the large can. Don’t worry if it doesn’t sit straight. The next step will hold it in place.