Костры: история, устройство и правила безопасности.

Fire lit at a campsite
campsite fires

A campfire is a fire at a campsite that provides light and warmth, and heat for cooking. It can also serve as a beacon, and an insect and predator deterrent. Established campgrounds often provide a stone or steel fire ring for safety. Campfires are a popular feature of camping. At summer camps, the word campfire often refers to an event (ceremony, get together, etc.) at which there is a fire. Some camps refer to the fire itself as a campfire.

A new analysis of burned antelope bones from caves in Swartkrans, South Africa, confirms that Australopithecus robustus and/or Homo erectus built campfires roughly 1.6 million years ago. Nearby evidence within Wonderwerk Cave, at the edge of the Kalahari Desert, has been called the oldest known controlled fire. Microscopic analysis of plant ash and charred bone fragments suggests that materials in the cave were not heated above about This is consistent with preliminary findings that the fires burned grasses, brush, and leaves. Such fuel would not produce hotter flames. The data suggests humans were cooking prey by campfire as far back as the first appearance of Homo erectus 1.9 million years ago.

Ideally, campfires should be made in a fire ring. If a fire ring is not available, a temporary fire site may be constructed. Bare rock or unvegetated ground is ideal for a fire site. Alternatively, turf may be cut away to form a bare area and carefully replaced after the fire has cooled to minimize damage. Another way is to cover the ground with sand, or other soil mostly free of flammable organic material, to a depth of a few inches. A ring of rocks is sometimes constructed around a fire. Fire rings, however, do not fully protect material on the ground from catching fire. Flying embers are still a threat, and the fire ring may become hot enough to ignite material in contact with it, or the heat the water to a vapor thereby cracking the rocks.

Campfires can spark wildfires. As such, it is important for the fire builder to take multiple safety precautions, including:
Avoiding building campfires under hanging branches or over steep slopes, and clear a ten foot diameter circle around the fire of all flammable debris. Having enough water nearby and a shovel to smother an out of control fire with dirt.

There are a variety of designs to choose from in building a campfire. A functional design is important in the early stages of a fire. Most of them make no mention of fuelwood—in most designs, fuelwood is never placed on a fire until the kindling is burning strongly.

The tipi (or teepee) fire build takes some patience to construct. First, the tinder is piled up in a compact heap. The smaller kindling is arranged around it, like the poles of a tipi. For added strength, it may be possible to lash some of the sticks together. A tripod lashing is quite difficult to execute with small sticks, so a clove hitch should suffice. (Synthetic rope should be avoided since it produces pollutants when it burns.) Then the larger kindling is arranged above the smaller kindling, taking care not to collapse the tipi. A separate tipi as a shell around the first one may work better. Tipi fires are excellent for producing heat to keep people warm. The gases from the bottom quickly come to the top as you add more sticks. One downside to a Tipi fire is that when it burns, the logs become unstable and can fall over. This is especially concerning with a large fire.

A log cabin fire build likewise begins with a tinder pile. The kindling is then stacked around it, as in the construction of a log cabin. The first two kindling sticks are laid parallel to each other, on opposite sides of the tinder pile. The second pair is laid on top of the first, at right angles to it, and also on opposite sides of the tinder. More kindling is added in the same manner. The smallest kindling is placed over the top of the assembly. Of all the fire builds, the log cabin is the least vulnerable to premature collapse, but it is also inefficient because it makes the worst use of convection to ignite progressively larger pieces of fuel. However, these qualities make the log cabin an ideal cooking fire as it burns for a long period of time and can support cookware. In an alternative method, a large piece of fuelwood or log can be placed on the ground next to the tinder pile. Then kindling is placed with one end propped up by the larger piece of fuelwood, and the other resting on the ground so that the kindling is leaning over the tinder pile. This method is useful in very high winds, as the piece of fuel wood acts as a windbreak.

The traditional Finnish rakovalkea , or nying in Scandinavian languages, also called by English terms long log fire or gap fire, is constructed by placing one long and thick piece of fuelwood (log) atop another, parallel, and bolstering them in place with four sturdy posts driven into the ground. Traditionally, whole un split tree trunks provide the fuelwood. Kindling and tinder are placed between the logs in sufficient quantity (while avoiding the very ends) to raise the upper log and allow ventilation. The tinder is always lit at the center so the bolstering posts near the ends do not burn prematurely. The rakovalkea has two significant features. First, it burns slowly but steadily when lit; it does not require arduous maintenance, but burns for a very long time. A well constructed rakovalkea of two thick logs of two meters in length can warm two lean to shelters for a whole sleeping shift. The construction causes the logs themselves to protect the fire from the wind. Thus, exposure to smoke is unlikely for the sleepers; nevertheless someone should always watch in case of an emergency. Second, it can be easily scaled to larger sizes (for a feast) limited only by the length of available tree trunks. The arrangement is also useful as beacon fire, i. e. a temporary light signal for ships far in the sea.

A keyhole fire is made in a keyhole shaped fire ring, and is used in cooking. The large round area is used to build a fire to create coals. As coals develop, they are scraped into the rectangular area used for cooking.

A "top lighter" fire is built similar to a log cabin or pyre, but instead of the tinder and kindling being placed inside the cabin, it is placed in a tipi on top. The small tipi is lighted on top, and the coals eventually fall down into the log cabin. Outdoor youth organizations often build these fires for "council fires" or ceremonial fires. They burn predictably, and with some practice a builder can estimate how long they will last. They also do not throw off much heat, which isn't needed for a ceremonial fire. The fire burns from the top down, with the layer of hot coals and burning stubs igniting the next layer down. Another variation to the top lighter, log cabin, or pyre is known by several names, most notably the pyramid, self feeding, and upside down [method]. The reasoning for this method are twofold. First, the layers of fuelwood take in the heat from the initial tinder/kindling, therefore, it is not lost to the surrounding ground. In effect, the fire is "off the ground", and burns its way down through its course. And secondly, this fire type requires minimal labor, thereby making it ideal as a fire of choice before bedding down for the evening without having to get up periodically to add fuelwood and/or stoke the fire to keep it going. Start by adding the largest fuelwood in a parallel "layer", then continue to add increasingly smaller and smaller fuelwood layers perpendicularly to the last layer. Once enough wood is piled, there should be a decent "platform" to make the tipi [tinder/kindling] to initiate the fire. Two small holes are dug in the ground: one vertical for the firewood and the other slanted to the bottom of the first hole to provide a draft of air for nearly complete combustion. Optional are flat stones to partially cover the first hole and provide support for cookery, and a tree over the pits to disperse the smoke.

Campfires have been used for cooking since time immemorial. Possibly the simplest method of cooking over a campfire and one of the most common is to roast food on long skewers that can be held above red glowing embers, or on the side near the flames (not over flames in order to avoid soot contamination and burnt food). This is a popular technique for cooking hot dogs or toasting marshmallows for making s'mores. This type of cooking over the fire typically consists of comfort foods that are easy to prepare. There is also no clean up involved unlike an actual kitchen. Another technique is to use pie irons—small iron molds with long handles. Campers put slices of bread with some kind of filling into the molds and put them over hot coals to cook. Campers sometimes use elaborate grills, cast iron pots, and fire irons to cook. Often, however, they use portable stoves for cooking instead of campfires. Other practical, though not commonly needed, applications for campfires include drying wet clothing, alleviating hypothermia, and distress signaling. Most campfires, though, are exclusively for recreation, often as a venue for conversation, storytelling, or song. Another traditional campfire activity involves impaling marshmallows on sticks or uncoiled wire coat hangers, and roasting them over the fire. Roasted marshmallows may also be used for s'mores.

Beside the danger of people receiving burns from the fire or embers, campfires may spread into a larger fire. A campfire may burn out of control in two basic ways: on the ground or in the trees. Dead leaves or pine needles on the ground may ignite from direct contact with burning wood, or from thermal radiation. If a root, particularly a dead one, is exposed to fire, it may smoulder underground and ignite the parent tree long after the original fire is doused and the campers have left the area. Alternatively, airborne embers (or their smaller kin, sparks) may ignite dead material in overhanging branches. This latter threat is less likely, but a fire in a branch is extremely difficult to put out without firefighting equipment, and may spread more quickly than a ground fire. Embers may simply fall off logs and float away in the air, or exploding pockets of sap may eject them at high speed. With these dangers in mind, some places prohibit all open fires, particularly at times prone to wildfires. Many public camping areas prohibit campfires. Public areas with large tracts of woodland usually have signs that indicate the fire danger level, which usually depends on recent rain and the amount of deadfall or dry debris. Even in safer times, it is common to require registration and permits to build a campfire. Such areas are often kept under observation by rangers, who will dispatch someone to investigate any unidentified plume of smoke.

Leaving a fire unattended can be dangerous. Any number of accidents might occur in the absence of people, leading to property damage, personal injury or possibly a wildfire. Ash is a good insulator, so embers left overnight only lose a fraction of their heat. It is often possible to restart the new day's fire using the embers. To properly cool a fire, water is splashed on all embers, including places that are not glowing red. Splashing the water is both more effective and efficient in extinguishing the fire. The water boils violently and carries ash in the air with it, dirtying anything nearby but not posing a safety hazard. Water is continuously poured until the hissing stops, then the ashes are stirred to ensure that water reaches the entire fire, and more water is added if necessary. When the fire is fully extinguished, the ashes are cool to the touch. If water is scarce, sand is used to deprive the fire of oxygen. Sand works well, but is less effective than water at absorbing heat. Once the fire is covered thoroughly with sand, water is then added over the fire. When winter or "snow" camping with an inch or more of snow on the ground, neither of the above protocols are necessary—simply douse visible flames before leaving. In lightly used wilderness areas, the area around the campfire is cleaned up to make it look untouched after the fire is extinguished. Campfire ashes are sometimes used in ceremonies like the Scouting campfire ash ceremony.