Thanks much MikeL.
The devil is in the details here fellows. Look and read the illustration captions very carefully. I asked, and Rob Windt explained some of this to me. Examples:
The blower shown IS an air forcing in blower because of where the outlet pressurized air comes off the perimeter. You can see this on most of the Finn vehicle pictures put up also. Kurts blower(S) was detatacble and only used for pressure blowing for manual starting up.
Carefully follow the primary air path from down low through the ash bin cooling cross feed tube then back up all around the outer jacker cavity. Outer shell is clearly marked “air pre-heating” and “fire safety shell”. He wanted this to be to the touch approvable. Inner produced gas cavity is clearly marked as “gas cooling”. Confused me HOW did the woodgas get up into this space from the bottom. RobW told me to realize there were spaces between the 12 angle iron brick supports. Note lIke MR Wayne he is specifing an SS grate.
Another overlook detail is that the top lid was double metal layered with insulation in between. I’ve only ever seen Vesa Mikkonen insulate his hopper lids for energy conservation. And both do DOME thier lids to direct any condensate drippage off the center of the wood fuel bed out to the outer edges. I was shocked there was no condensate catch ring built in. Shows just how much WHERE you live climatewise and your wood fuels will influence your designs.
WayneK’s the best I’ve seen for wet humid climates and wood fuels hands down.
Look and see where KurtJ was putting in his suction governed water - NOT low down to be pre-steamed like a charcoal gasifier, but as close to his nozzle as possible for maximum cooling of the brass nozzle metal. Brass?! Yeah. More corrosion resistent up in the fuel “bin” hopper acids and conducts center gasifier core rising heat build-ups better.
I think you would have to be a very, very good metalsmith craftsman to dupicate KurtJ’s buildup and maintain those 1/4 inch (5mm) shell/jacket clearnces with air and gastightness. Bigger, easier gaps and you will then not get the woodgas to air heat transfers in this small and light of package. Remeber this was for vehicle useage. Weight is KING. Size and space are the Queen and the crown Prince/Princess.
GaryH. just last evening my wife had on the 2nd of a three series production of the geological/biological history of the World as shown by the Australian continent. Geez, man, I did not realize the title of Mr KurtJ’s book “Son of the Red Centre” he was refering to the washed in dry center bowl of your whole country! Here in the US that would be most all of states of Nevada, most of Utah with parts of Oregon and Idaho. The BIg Basin. BIG, BIG. Dry, dry. With alkaline and salt flats. Canada has this BIG type of inward draining area too. Marches, lakes and permafrost. DRY too but cold blowing.
Hello MagneK I see no evidence that KurtJ was was unsing any form of produced gases re-injection.
I’ve only heard of this used in Real in the World systems in one or two FInnish systems having been found by accidental jacket burn throughs. Never explained. When I get a good dial-up download connection I will finish you link download and read it.
Regards to all