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All concrete continues to gain mass and get harder over time.
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I tried to drill into a concrete porch step that was cast in the 1940s. It was like that.
Off-topic, but it never stopped me before....
The rocket stove takes off!
airburners.com/technology/principle/
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The primary objective of an air curtain machine is to reduce the particulate matter (PM), or smoke, which results from burning clean wood waste. Using a technology called "air curtain," the smoke particles are trapped and reburned, reducing them to an acceptable limit per U.S. EPA guidelines.
Clean wood waste is loaded into the FireBox, and an accelerant such as diesel fuel is used to ignite the wood waste, just as you would start a campfire or open burn pile. The air curtain is not engaged until the fire has grown in strength, or the air curtain may blow the fire out. Once the fire has reached suitable strength, usually in 15 to 20 minutes, the air curtain is engaged. The air curtain then runs at a steady state throughout the burn operation, and the waste wood is loaded at a rate consistent with the rate of burn. Our smallest machine will burn at a rate of 1 to 2 tons per hour; our largest machine can burn in excess of 10 tons per hour.
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It looks like a vortex generator, exhausting clean hot air. I wonder if it powers itself or charges batteries.