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Pics of knothole?Visible smoke is produced when the combustion is less than the ideal air/fuel ratio (stoichiometric). In our pellet grills, it produces more smoke when the fan is off and the fire in the pot has more fuel burning than oxygen to keep it at the ideal air/fuel ratio. I think this is where the "art" is; keeping the fire slightly rich, but not too rich with fuel and keeping enough hot fire going that fuel can be added without allowing white smoke.
Same thing goes on in a stick burner. Toss in a log and the smoke goes way up. Us backyard stick burner cookers usually just toss in the log and accept the smoke. Many like the bbq from this process. I was invited to work with a competition team where tending the fire required keeping a pit basket running outside the pit and getting it to the optimum point where all the wood was burning well and beginning to coal up before putting that basket in the pit running the meats. There was never a fresh piece of wood or charcoal introduced to the fire box on the pit. That produced the best smoke in their opinion. I have to agree. Never thick, never bitter, very much like the pellet grill. Backyard pitmasters just can't do that level of effort, nor is it economically practical, and neither do many of the best restaurants.
The big restaurant pits can use huge smokers with big fires. Those fires can be run hot enough to get closer to the ideal if they have huge pits or mulitiple pits run from one fire, to use all that heat. And tossing in relatively small amounts of fuel in a roaring fire minimizes the bitter smoke produced (just like our fire pots running with the fan).
If you checkout he consumer Franklin offsets, you'll see they have no draft adjustment. This is because he wants control as many of the pit parameters as he can, and you just build a fire to reach the pit temperature. He wants you to keep enough air flow on the fire and only allow you to control pit temperature with fuel quantity.
Just my view from my little knothole.