Ural Motorcycle on wood gas  Occasionally, we come across a
technology that has just kind of been forgotten about. Take this
Ural motorcycle. It runs on a substance called wood gas, which
is the byproduct of incomplete combustion of carbon products
like wood, hence it's name. The fuel goes through a process
called gasification in a wood-gas generator to produce
combustible hydrogen and carbon monoxide. So basically, you're
burning wood to produce fuel.  This Ural has had a rudimentary
wood-gas generator fitted, while an a number of other low-tech,
scrounged items make up the rest of the side-car-mounted system.
According to The Knee Slider, the top speed of the bike is a
mere 80 kilometers per hour (about 50 miles per hour), while the
fuel it runs on is quite bulky. Still, if you run low, just pack
an axe and hope you run out of gas somewhere that's wooded.
Wood-gas-powered vehicles might be uncommon today, but they were
a normal means of transport in the past. Vehicles in Germany,
Sweden, France, Denmark, S