A good rocket stove is a high efficiency cooking stove that uses burns wood in a chamber with a vertical chimney and secondary air supply. This ensures that the wood is almost completely burned before the flames reach the cooking surface.
Due to its simple concept, this kind of stove is open to all sorts of modifications. This video shows one variation that has a gravity-feed hopper to accommodate different types of wood and is particularly rugged.
DIY video shows: Durable Multi-Fuel Source, Multi-Use Rocket Stove That Accommodates Different Types Of Wood And Is Particularly Rugged.
Image source: approtechie
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