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I see some designs for rocket mass heaters on the internet and I found them very interesting as a sustainable heat source.
In a normal wood-burning fireplace, the chimney needs frequently cleaning. But in a rocket mass heater, the outlet pipe has several bends, so how can we avoid blocking the chimney outlet and how can we keep it clean?
Chimneys almost never clog from soot/creosote buildup, so your assumption is flawed, but thick buildup is dangerous because of the potential chimney fire.
A well-designed, well-managed rocket mass heater will produce a tiny fraction of the buildup of a conventional woodstove. So the concern is minimized.
You can build a cleanout at each corner to let you reach in with cleaning tools.
