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FormulaNova said..
Maybe Macro can go the other way? Design a huge rocket stove and give it to his neighbour to burn up anything he wants.
When done properly the flue gets pretty hot and more of the 'smoke' burns and the hotter exhaust tends to make it rise a lot better.
I was playing with one of these in the backyard. When not up to temp there was a heap of smoke around. Once up to temp, you wouldn't have known there was a fire at all. I'm not sure how you would feed one with leaves, but that's not my problem to worry about.
Indeed I did build a few years ago , cyclonic incinerator. even demonstrated to the neighbour.
Made of ordinary steel barrel with air supplied at the top at angle to create cyclone inside.
Small centrifugal ventilator 100W is sufficient , but vacuum cleaner exhaust could do as well.
Fully loaded with fuel and small vent 10cm diameter in the middle of the top cover.
It is burning everything from top to the bottom without any smoke or smell at all.. Because of cyclonic action no dust particles escape, and the flame is clean and blue regardless what is actually burning , wet or dry.You could burn even tyre and can't see any smoke at all. This approach needs some planing , preparation, setup, - so much easier just dump leaves on ground and burn.
Temperature at the top of the flame could be close to 1500C in atmosphere rich in oxygen or more so burning is complete .
When working ,incinerator looks like upside down rocket engine and even sound like one. Whole barrel becomes glowing light red and you could not even get closer then 5 meters due to radiating heat.
But even so I prefer now composting over my incinerator.