Science, Theory & Math

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ARTICLES Technology Science, Theory & Math
Members Only Just Say No To Wicking: Non-Traditional Base Layers Based on a Next-to-Skin Fishnet Model
by Ryan Jordan and Mike Martin
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ARTICLES Technology Science, Theory & Math
Members Only A Survey of Water Hazards and Water Treatment Methods - Part 6: Ultra-Violet Light Methods
by Roger Caffin, with help from Will Rietveld, Ray Estrella and Rick Dreher
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ARTICLES Technology Science, Theory & Math
Members Only A Survey of Water Hazards and Water Treatment Methods - Part 5: Filtration Methods
by Roger Caffin, with help from Will Rietveld, Ray Estrella and Rick Dreher
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ARTICLES Technology Science, Theory & Math
Members Only A Survey of Water Hazards and Water Treatment Methods - Part 4: Chemical Methods
by Roger Caffin, with help from Will Rietveld, Ray Estrella and Rick Dreher
A look at several different chemical techniques for treating water in the backcountry. Read More...
ARTICLES Technology Science, Theory & Math
Members Only A Survey of Water Hazards and Water Treatment Methods - Part 3
by Roger Caffin, with help from Will Rietveld, Ray Estrella and Rick Dreher
Part 3 of this series takes a critical look at several water treatment technologies available to backpackers Read More...
ARTICLES Technology Science, Theory & Math
Members Only A Survey of Water Hazards and Water Treatment Methods - Part 2
by Roger Caffin with assistance from Will Rietveld, Ray Estrella and Rick Dreher
Remove, kill, or inactivate? Part two of this series analyzes the legal and technical definitions as well as the practical significance of water purification and filtration. Read More...
ARTICLES Technology Science, Theory & Math
A Survey of Water Hazards and Water Treatment Methods - Part 1
by Roger Caffin with assistance from Will Rietveld, Ray Estrella and Rick Dreher
The first part of this series provides an overview of the threats that can exist in untreated (and in some cases treated) water sources. Squeamish and hypochondriac readers be warned. Read More...
ARTICLES Technology Science, Theory & Math
Members Only The Myth of Pressure Regulators
by Roger Caffin
Part 1 in a two part series analyzing some of the claims made by stove manufacturers about pressure regulation technologies. Marketing spin or proven performance? ***Updated with Addendum on 6/12/12*** Read More...
ARTICLES Technology Science, Theory & Math
Members Only Storm Resistance of Ultralight Shelters: Part 1, Introduction
by Ryan Jordan
Evaluating the wind and snow loading of shelters for ultralight backpacking in inclement conditions. Read More...
ARTICLES Technology Science, Theory & Math
Members Only Apparatus for Testing Thermal Insulation Properties
by Roger Caffin
When it comes to assessing things like air mats, foam mats, and other insulating things, the common measurement is called an R-value - meaning thermal resistance. We describe equipment designed and built to provide calibrated measurements of R-value for BPL articles. Read More...
ARTICLES Technology Science, Theory & Math
Members Only The Effect of Cold on Gas Canisters
by Stuart Robb & Roger Caffin
Ever tried to use your stove in the cold only to find that it just won't work, even although shaking the canister tells you there is plenty of fuel left? Then, when you check it at home to see what's the matter, it works perfectly. What is going on? Read More...
ARTICLES Technology Science, Theory & Math
Members Only Catenary Curvature as an Element of Ultralight Tarp Design
by Ryan Jordan and Alan Dixon
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