Hi Chris, thanks for giving this project it’s own thread! We originally started this build for better understanding of larger coal units,"gohin poulenc’ style, though I personally prefer a very nice wood gasifier, this beast is tough! I hope to answer everyone’s questions as best as I know how.
Hi Woody, yes we have played with the degree of how much we cook out the wood to char for energy reasons, we found that the gas stays clean and strong, if you heat out all the water out but not ALL the gases. Takes about 3 hours making the right Charcoal, timing is everything.
70 mph is max top speed on his unit, it averages between 60 to 65 on flat land, 55 to 60 up step hills. His van rig is so heavy, it does not go much faster on gasoline.
Over heating is a major concern with a coal unit and can ruin itself, if not maintained, they can reach incredible temperatures. The stainless container holds water that is metered in via temp gauge, We added a tap from the exhaust, we have not added exhaust gas tube yet, But I would prefer exhaust over a water drip (doesn’t need a refill).
In the vid at 2:02 is us returning from a long trip. we were almost completely out of fuel and water.
My camera in the vid detected the heat, but in person the gasifier did not glow blue, It did faintly glow, this unit only has one layer, we have added a fire plate (Pederick style), since then and that too makes a big difference in keeping the bed in the center!