The Sumo makes the best use of all the principles we've evolved over the years:
*the shape ..... allows for big fuel loading, and makes for...
*big radiant surface area .... for fast heat transmission
*safety ... the fuel is always collapsing to the centre of the fire, and makes for...
*easy access ... for loading
*no baffles! .... the shape helps create vortices for thorough combustion
