Primitive Technology: Convection turbine experiments (hot air windmill)

This video showcases an experiment with a convection turbine, a windmill powered by hot air, in a primitive setting. The creator modified a radial fan into an axial form to test its viability as a power source independent of water. The turbine spun well when hung above a fire and was later used to power a forge blower, though the experiment ended in failure. The concept shows potential but requires further development.