For a few weeks now I have been trying to build a gasifier camp stove. This is a camp stove that efficiently burns wood. In a camp fire wood burns inefficiently, in fact much of it is not burned at all. Much of the combustible material is lost as smoke and is left behind as ash. Also, most of the heat is lost and is not easily directed to heat food. A camp stove is very convenient, but you have to lug fuel with you and the fuel is usually non-renewable fossil fuel.
My plan is to design a wood burning camp stove, that has the portability of a camp stove, but Burns wood. Currently it works, but the flames are a bit big. I am going to experiment to see if I can get the heat a bit more concentrated at the top of the stove, like a real camp stove. Fore a more complete description of my stove check out The Brain Saver