Good tutorial on how to make a simple rocket stove.
http://www.instructables.com/id/How-to-make-a-Rocket-Stove-from-a-10-Can-and-4-So/
This is a companion discussion topic for the original entry at https://peakprosperity.com/how-to-make-a-rocket-stove-from-a-10-can-and-4-soup-cans/