Update: Root Simple reader Ruben questions whether it is possible to build a true rocket stove out of metal. Ruben sent me to a Facebook post by Benjamin Rosen who says, speaking of another metal rocket stove, “Actually, you can say that this is not a rocket stove. A rocket stove gives great heat from a small amount of fuel because it burns very efficiently at high temperatures. This is achieved by having a ceramic lining in the combustion chamber that permits very high temperatures because it insulates the combustion chamber, and because it absorbs and returns the heat to the chamber by glowing white hot. A metal lining, as we see in this design, will shed heat to the environment and therefore cannot reach the high temperatures needed for a true rocket stove. Metal, in any case, would melt at the temperatures achieved in a true rocket stove combustion chamber.“
Rocket stoves cook food with small pieces of wood efficiently and with much less smoke than conventional wood burning stoves. They also help prevent deforestation since you can burn small twigs trimmed off a tree rather than burning logs. Search the interwebs and you’ll find may different designs. But they are all based on burning wood in an “L” shaped tube to create a chimney effect. Insulating the tube increases efficiency.
A friend who lives in a remote part of Southeast Asia is visiting us this month and we wanted to come up with a design for a rocket stove that could be made from commonly available materials with nothing more than hand tools. Our goal was done rather than perfect. Here’s how we did it: