you need very little fresh air inside a sealed tarp shelter - Arms Locker
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Old 11-20-2020, 06:07 PM   #1
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you need very little fresh air inside a sealed tarp shelter

Kochanski was concerned with keeping the shelter portable. He orignally concieved of this shelter for downed airmen, who would already have their parachute material. So, the only extra materials they had to carry was a bit of duct tape, the space blanket and the clear plastic. Because he felt that a fire was necessary, he did not bother to stuff debris between layers of the plastic. for his "supershelter" idea. On the alone show, you've got plenty of tarp-membrane and you wont be moving. So you intially put up a single thickness lean to, and later, you can add the second layer of tarp, with the debris between the layers, taping the edges of the tarp, sealing in the air. The debris is not warming you, folks. The goosedown in an $800 sleeping bag is not warming you. It's just filling space, creating dead air space. That trapped air is what insulates you from the cold and wind. Because down feathers are worthless after they get wet, the material of the sleeping bag is taffeta, which lets out your body-moisture and a little bit of your body heat leaks out with it.

You need to be inside of a tent or tarp bivvy to protect the sleeping bag from rain or snow. Your body heat is often enough to melt snow that lands on you and then you've got a wet, worthless sleeping bag, cause you are NOT going to dry out that goose-down in the field, unless you've got several days of light breezes and sunshine and you'lll probably still have to cut open the bag, un-clump the feathers and hang the on wooden frames with bugnetting to keep them from being blown away. If you''re being chased or shot-at, and you run thru thorns, dive prone on sharp rocks, etc, roll over seeking cover, you can expect to tear your sleeping bag and have it leak feathers all over the place.

The cockpit of a fighter jet is a very restricted space, so having a sleeping bag is out of the question, yet he was training the Canadian Air force in wilderness survival and it's cold 7-8 months of the year. in Canada. If there's hostile forces, a fire might be a death sentence too. So he sought a way to protect you down to freezing temps, without much clothing, no sleeping bag needing very little gear. He found that altho it might have been 0F at dawn, on a sunny day, the sun shining thru the clear plastic would warm the supershelter to at least 30F by noon, some times 40F, if it was not late winter and far north where the sun is so low in the sky When you add your trapped body heat, a fit man, conditioned to the cold, might be ok without a fire, down to -10F, if he exercised in the shelter at night, and then slept during the warmth of the day, with minimal clothing. and no fire at all.

MY idea of the two layers of the much more transparent PEVA shower curtain lets thru more sunlight (single thickness) and even double thickness, with some trapped air between the layers, tape-sealed edges, it lets thru just as much radiant heat as the single layer of the cloudy construction plastic. Also, such plastic is noisy in the wind. and cracks in extreme cold. The PEVA fares much better in such conditions.

Mors was concerned with the pilot's minimal clothing being soaked with condensation as he slept. Since I"m talking 5 layers of clothing, debris and a layer of tarp clothing for the Alone TV show, also with debris between the tarp "garments" and you, I am NOT concerned about condensation. Mors felt that it was necessary to leave the bottom edges of the shelter with small air leaks. I do not want such leaks. I want the bottom edges folded inside and flat on the ground, and dirt piled upon those flat-edges, so as to seal the shelter. When you intend to sleep or are at risk of falling asleep, you peel back 1/2" of tape, on opposite sides of the shelter, low down enough that the SMALL amount of air-exchange takes place under your raised wooden bed. Ie, a foot in the air.

if you DO need fire-warmth, you can discretely get it, by digging a 2 ft deep pit, with another hole 4 ft away joining the fire pit at a low angle. That draft hole should face the wind. 2 other holes, opposite sides of the exhaust hole, should be at about a 30 degree angle from vertical. By adjusting this angle and pouring loose earth around the logs in those holes, you can make them "gravity-feed" and burn only on their bottom ends.

If you cover the exhaust hole with a tarp or boughs, 7 ft up in the air, they will not catch fire. Dampen the boughs if and when they dry out. Set a foot-wide, 6" thick flat rock on 3 smaller rocks, so that it covers the exhaust hole, but the fumes and heat can get around it to exhaust and that rock will get VERY hot in half an hour. Put it in a pit under your raised bed. You can do 3 of such stones if needed and you'll be ok at -10F-20F. for 4 hours. So you wont need much firewood, even when it's that cold, and then only at night.

if you've added the 2x2x4 ft cold air sinkhole, half in and half outside of your doorway and the double wall of tarp, putting debris between the layers of tarp, taped the edges and sealed the shelter with tape and dirt. given all the clothing that you get to take on the alone show. you'll be ok at -10F or even-20F, without the sleeping bag, using just the hot stones under your bed, no sleeping bag required.
How much cold you can tolerate will vary according to how fit you are, how much body fat you have, how conditioned your are to the cold, how much food you have, if the food and water was HOT when you consumed it, if you exercised a bit before and during your stay in the shelter, and how "tough" you are mentally and physically.

So, only for the last month of the 100 day challenge, which ends the day after Xmas. are you subject to need the outside, Siberian fire-lay "aimed" so as to project its one-way heat thru the clear vertical wall of the lean to (and then only for the coldest hours of the night). The hot rocks will warm you for 4 hours or a bit more. So you are going to need the continuous Siberian fire lay, aimed at the clear vertical side of the lean to at most for a month and only at night. That means youll need a LOT less firewood than if you ran such a fire 24-7 for 100 days, eh?

So, even if you dont get the 2 inches of snow needed to make the igloo, you'll still not need much firewood nor any sleeping bag. Learn to sleep during the day and do your chores at night, using the camera light, your head lamp, grass, moss torches soaked in fish oil or animal fat.

That 12x12 tarp, half reflective and half clear, does a LOT more than replace the sleeping bag. It becomes your shelter and your poncho and leggings. A 50 sq ft chunk of the 20x20 tarp is needed to make the second layer of tarp for the slopping back and sides of the lean to, to make bait-bags, to make food bags, to make the water wings you'll need when on the raft, because the life vest has been used as one of the pontoons that provide the raft's flotation. The rest of it can and should become netting.

If you DO get the 2 inches of snow needed to make your igloo, you can tolerate -30f, without a fire or sleeping bag, just the 5 layers of clothing, poncho and tarp wrapped around you, with debris between each of the layers. Given the hot rocks, you can handle -40F. So you definitely want the igloo but you might not get enough snow, that early in the year. So you have to have a backup plan.

Last edited by boati; 11-20-2020 at 06:23 PM.
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Old 11-20-2020, 06:28 PM   #2
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if you have your shelter on the ice, near your net slits and fishing holes the timing works out about right. Set the stones on the fire to be warmed as you services your hooks and nets. By the time you're done with that chore, the rocks will be hot. Move them into your shelter, and hole up for another 3-4 hours. Given the boughs and snow over the open water, you'll only need to bust 1/2" of ice every 4 hours or so Yes, it's all a huge pita, but you're being paid $10,000 per day! So smile and chuckle as you do what you have to do.
Old 11-20-2020, 07:15 PM   #3
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Originally Posted by boati View Post
Yes, it's all a huge pita, but you're being paid $10,000 per day! So smile and chuckle as you do what you have to do.

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