Been away for a while, just found this. Wow, great topic and thread. Yes, Maxgasman taught us (or me, at least) about upward facing angles for grates, about a dozen years ago.
After debating back and forth on my F150 charcoal gasifier, I’m going to stick with the updraft. Sure, with the updraft you wind up with an initial bed of dampish charcoal (after a long shut down), and that moisture doesn’t go through the reduction zone, but that can be vented/flared/dried upon startup. Otherwise, I like the predictable “partial combustion”/reduction zones of the updraft, as well as the inherent cooling and filtering. Cody, I think, asked for some nozzle size calculation comparisons, and I’ve about gotten that finished, will post soon.
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