If you have a vacuum on the inside edge of the bowl and air is moving between the rounded edges with an opening in the unsealed metal edge. The velocity of air moving between the edges will open it even more until the vaccum drops and velocity lowers keeping it open. The same thing as air passing over a wing effect giving it a lifting force. Spring tension and bowl weight are going to be factors in this.
Bob
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Hi Everybody.
I have started a new topic with a collections of my drawings, part list, spec’s sheet, and/or operations procedures, it is call: “Drawings of charcoal gasifiers for vehicles”. In this new topic is included the work I have done for this topic. Thank’s Jeff.
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Hi Bob!
24.5.2018
You are totally missing the pan diameter!
The pan diameter tells the “piston diameter” of the pan. The pan bottom surface
is = the piston surface.
Piston surface X pressure difference (outer/inner) makes the pushing force upward.
The pan-edge dynamics do not contradict the “piston pressure” generated
by pressure differernce in/out - side the pan…
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Oh the light just came on, thanks Max. I miss it again, but it is great to have people like you help us out.
Bob
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You know fellows for those of you wanting to go-more-discreet hiding in plain sight; or upgrade the perception from ho-hum old wood you could adopt Jeff Davis’s terminology.
“I’ve been working some more on my Air-Carbon-Fuel-Cell.”
“How is your AC-FC coming along?”
In-the-know talking. Need-to-know talking.
S.U.
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This is a photo of the oxidation plate, after a couple runs. This is the producer that is on the front of my log hauler (small red machine).
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Jeff,
I’ve been in Rwanda and missed this picture when first posted. Can you help me get oriented? I can’t tell which way is up, down and sideways. I’m guessing that the picture is upside down and we are looking out through the lighting port?
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Hi Bruce,
Open the fill lid and shovel down, through the charcoal, until the air inlet is found. Like a nozzle but a baby Pedrick instead.
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One mistake is that it should have protruded further into the produce because the out side of the producer gets hot enough to soften the plastic filter that is close to that hot spot.
The big out side pipe I would make a larger diameter. More heat sink and help preheat the water vapor and air. Tha water drips into this pipe that is welded to the back of the oxidation plate. I think this pipe will be called the outer pipe. This is the pipe with the elbow screwed to it.
The inner pipe is shorter in length. Diameter is just larger than the hole in the oxidation plate. The inner pipe is inside the outer pipe. It helps to cool the oxidation plate and preheat the steam/air. It might also focus the air stream.
However, this is just talk at this point. Ask me in two years, how is it holding up?
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Hi JeffD,
Perhaps explain the relitivly unknown, Pedrick “hot-plate” system versus all of the in-free-surrounding-space producers.
Regards
S.U.
Ha, l used a similar nozzle design on my charcoal powered moped way back. Didnt work for me as the maseve plate sinked heat too much for the litle 50cc engine gasifier. But l bet it wuld for a larger engine.
I stoped looking for a intense heat proof material long ago, its the mass l swear on. Cheap and reliable.
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SteveU, there is the nozzle design that we all know. Minimal amount of material that is exposed to a large sized hot spot. The lonely soldier fighting the forest fire all by himself. Ouch! Soon to tire…
The fire plate, I renamed “oxidation plate”, is a large plate, mass, that has a better chance to face the fire. A hole in the wall, so to speak. Now there is an army to fight the forest fire. Heat sink. Heat dissipation. Of course armies can also loose the war.
I choose the word soldier because they are common people like the material I like to work with.
Pederick gave a lifetime warranty for the fire plates used in his producers. Of course they were heavy. So heavy that the weight of one of his gas producers broke the rear axle of a politicians fancy car or so the story was told.
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Without getting to detailed on a public forum, the doctors say I’m running out of time. so here is my next light weight version of my gas producer. As SteveU would say, old men should pass their experience on to others. This forum is my only way to do that. Not sure if I have much to pass on but I will try and maybe it will also help me.
Made out of two wonderful metal 5 gallon buckets that were gifted to me! Made in Japan, top quality. between the two buckets will be two coaxial tubes that I want to roll out of scrap sheet metal (represented by the blue plastic container). The inner will allow the charcoal to pass from the top fuel hopper bucket to the bottom partial reactor bucket chamber. The outer tube will pass the gas out thus preheating the incoming charcoal and cooling the out going gas. The outlet pipe is represented by the white paper.
Below the bottom bucket will be the oxidation and grate zone. That is the space between the floor and bottom bucket. The can that the bottom bucket is setting on can not be seen in the photo.
This is just stacked up with plastic cans and stuff to give a vague idea of the design.
It would be nice to build two of them before Argos so I could ship one of them to the show and donate it to somebody like BruceS but I have a lot of doubt that that will happen in time.
I wanted to buy a small slip roll for these projects but I doubt that it would bring much at an auction when I’m gone and it would be just a waste. Maybe I can roll the sheet metal by hand for a few builds.
I have a new charcoal grinder in mind and a wood fired space heater but I doubt that I will get to the heater. I do really want to build the new grinder.
Oh well, this new turn in the road allows more time to work with my Raspberry Pi 3 + and re-learn Python. 
Cheers and let me know your thoughts!!
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Jeff, looking great.
How much time you got left to teach some ?
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Your designs have always been amazing. Very sad to hear of the news of not much time. I will be praying for a miracle for you!
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Maybe the doctors at the Cleveland Clinic will have other ideas. I have an appointment with them Thursday. I plan to leave work Wednesday afternoon and drive to Cleveland and stay in a motel over night. Then after the Thursday morning meeting head back to work. Too many appointments!!! Not to mention Monday and Tuesday at Erie.
So lets wait before commenting. 
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Wow Jeff, I’m at a loss of words. I hate news like this. I’m glad you shared, it’s just been so many for me lately. I too will send prayers.
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Hi Jeff, I like the metal buckets and you new Idea. It makes me want to start on one like this.
Super light weight and if you put some ceramic insulation in the lower bucket that might help with heat.
You have been a inspiration to me ever since you build your red Air Carbon Fuel Cell and coined that title for the charcoal gasifier. It is original and it is yours.
Jeff, you have now just been added to my daily prayer list.
Doctors don’t have the final say.
Only God Does, he holds the keys to death and life. Expect a miracle from God. He Is The Miracle Giver. IN JESUS NAME.
I would not be speaking to you if God had not saved my life.
Bob
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I suspect Cleveland may have something to say about it though. It depends on what you have but I know more then a few that have been given 6 months to live and lived for years. I think everyone here sincerely wishes you the best of luck and will miss you if things do go south.
According to the Egyptians, you can take it with you! Might as well make the best of what time you have left! (although I am unsure whether woodgas is up on that list…) Plus you usually can get at least half the money from it from craigslist for tools like that maybe more. Honestly it looks like about the size of a coffee can or 1 gallon food can if you can still find a metal one, but what -might- work almost perfect is a freon/refrigerant gas cylinder. How hot does that center section get?
My first thought is I hope you get this done, so we can see. 
How hot is the air coming out of the filter on the red one? I would rather have something like the red one to run my foundry furnace rather then put charcoal directly in. However, that means it needs an inline type of fan or venturi type of valve system, since I would like to be able to control the temperature potentially for a kiln.
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Jeff,
Your designs are so peculiarly clever. This forum will keep your existing ideas alive, but I want more. You make me think in new ways. I too am praying that you will be healed of whatever appears to have you at risk.
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