Kind of a random idea I had today. Not sure how feasible it would be, and so I thought I'd ask here to see if people had more experience with rocket mass heaters or Dakota fire holes.Here's the idea:1. Dig trench2. Put a section of furnace/HVAC exhaust ducting in trench3. Bury duct with earth, leaving ends open4. dig small pit at one end5. Make fire in the pit, use the buried duct as a rocket mass heater6. Keep "Dakota fire hole" going for a while to heat up earth above duct7. Sleep on heated earth to stay warm at night8. Use a piece of tarp over sticks or something to cover the holes when you leave9. Return to the same location, and have a ready-made heatable "bed" that's also concealed http://ift.tt/2ht6CIh
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