Here is a full video walk around of the tractor running at the local fair Saturday. No Narration sorry its just too noisy. The white buckets you see behind it are full of charcoal ground to a size of roughly 3-15 mm with the dust sieved out. The charcoal comes from coals shovelled out of my wood stove over the winter. Each one is 22 litres and represents between 2 and 3 litres of gasoline equivalent.
Rocket Mass Heater Plans: Annex 6" L-shaped Bench by Ernie and Erica