Simple bio-stove for camping or shtf
Lite weight big performance. (SHTF stuff hits the fan - move to the hills)
Little single burner to boil water or heat sausage and eggs or a brick for a old fashion bed pan warmer. Will burn dried straw twists or twigs. Light weight and easy to use and limit the fire issues takes small firepit. Thus you need to carry no fuel.
Made with two cans. One must fit inside the other and be 1 inch taller. The smaller can gets 8 holes drilled around the base. The taller can gets 8 holes around the base and 8 more around the open rim.