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[–] KiltedKen [S] 0 points 0 points (+0|-0) ago 

I use the inverted fire, also known as the upside down fire, on all my campfires. I've demonstrated this fire building technique to people who have been laying fires in the outdoors for years. They are often amazed that it works at all.

When I first tried this technique, I was dubious. I thought the heat from the fire was concentrated near the top of the fire, but it turns out the heat from a fire is more like a ball in shape and doesn't have to be the same shape as the flames. This means wood below the flames will catch on fire just like the wood above a fire.

Other techniques where you build the fire under larger tinder are hazardous because the larger tinder can fall and put the fire out. That's why I've given up on the teepee and log cabin type fires. Also, I believe much of the heat of a fire is lost to the cold wet ground when the fire is close to the ground. The inverted fire technique raises the initial fire above the cold ground, and the heat from the fire is warming and drying the upcoming fuel. This is especially important when the fire is just starting.

As the video points out, if you build this correctly, you light it and then don't have to mess with it at all. The spacing is important, in that you want air to travel between your pieces of fuel, but you also want the fuel close enough that it's burning heat, and the chemicals it will release, contributes to the heat and fire of the rest of the fuel. (How Fire Works).