Simple Rocket Stove Concept

Ed makes stuff

Here's another rocket stove concept.  An idea flashed into my cranium, with the thought of using insulation.  The guy who made a concrete rocket stove used some mixed inside of his concrete.  What about using something that would trap more heat inside, so the flame would be hotter?

This one seems to perform well enough to boil water.  Perhaps it is better to leave well enough alone.  ( I am having brain flatulence these days.  Would AOC want to regulate that? )