These gasifiers was know to “backfire” alot, owners of these seldom had any eyebrows left.
I don’t know why, it’s the only thing i’ve heard about them.
Charcoal gasifier from “Bruzaholms bruk” a foundry known for making hydraulic ram pumps, whereof one is placed in a museum, known to have operated unattended for 70 years.
They also made stirling engines by Ericssons patented model.
French participant in “Rallye Monte Carlo” 1939, Panhard with charcoal gasifier.
Some German gasifiers, altought producers of the famous Imbert, Germany had very small amount of woodgas/charcoal cars and trucks, until fuel supplies started to get low.