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<blockquote data-quote="jmden" data-source="post: 817669" data-attributes="member: 1742"><p>You may be experiencing what is called 'misting' where there is enough hydrostatic head created by very large, storm force wind driven rain drops hitting at right angles (see the several variables here already) to tent fabric that could conceivable cause some amount of moisture to seep through. The extreme conditions necessary to come together to creat this type of scenario are pretty rare however as they must also be coupled with a waterproofing (silicone or PU) that has likely been damaged or broken down with use to a degree. </p><p></p><p>You can do all kinds of research on this phenomena and <a href="http://www.backpackinglight.com" target="_blank">BackpackingLight.com - The Community of Lightweight Hiking and Backcountry Travel</a> is a great place to start. This is a great forum for any of you backpacking guys. They do a pretty good job of staying on the 'cutting edge' in terms of good gear, techniques, etc. There's research that shows the size/weight of raindrops and the resultant force on tent fabric at right angles and other angles depending on the force of the wind, etc, etc. if you really want to look into it. BUT, more than likely what you are experiencing is simple condensation naturally forming (very typical given the conditions you mention) on the inside of your tent fabric, then getting knocked off of the inside of the tent fabric by the force of the raindrops and perhaps wind hitting the outside of the fabric. One of the most respected staffmembers backpackinglight.com who's experience and research is amazing has this to say as a general statement about such situations:</p><p></p><p><span style="color: RoyalBlue">"I am going to agree with Steve here. It is extremely unlikely that falling rain could create enough hydrostatic head to push that much water through silnylon. Even torrential rain. The outside surface of the fabric gets a film of water on it which buffers the raindrops.</span></p><p><span style="color: RoyalBlue"></span></p><p><span style="color: RoyalBlue">In torrential rain the fly will cool fast, helped by the fact that the rain is often significantly colder than the ambient air. Of course, your being inside the tent with some damp clothing is going to create ideal conditions for condensation to happen within seconds. The rain on the warm ground will do the same. </span></p><p><span style="color: RoyalBlue"></span></p><p><span style="color: RoyalBlue">Take a cold bottle out of the fridge on a humid day and see how long it takes for condensation to form. It can be very fast.</span></p><p><span style="color: RoyalBlue"></span></p><p><span style="color: RoyalBlue">You will note that some people say it didn't happen to them. A distinguishing feature between the two cases is often that the 'torrential rain' is on a very still humid day, possibly warm, while the other cases are on less humid days, possibly cooler, with some wind.</span></p><p><span style="color: RoyalBlue"></span></p><p><span style="color: RoyalBlue">Taking a step back from the details, to what sort of tent is suitable. This is a subject which has been thrashed over many times here. A double skin tent (NOT a netting inner but real fabric!) is generally the recommended solution for these conditions."</span></p></blockquote><p></p>
[QUOTE="jmden, post: 817669, member: 1742"] You may be experiencing what is called 'misting' where there is enough hydrostatic head created by very large, storm force wind driven rain drops hitting at right angles (see the several variables here already) to tent fabric that could conceivable cause some amount of moisture to seep through. The extreme conditions necessary to come together to creat this type of scenario are pretty rare however as they must also be coupled with a waterproofing (silicone or PU) that has likely been damaged or broken down with use to a degree. You can do all kinds of research on this phenomena and [url=http://www.backpackinglight.com]BackpackingLight.com - The Community of Lightweight Hiking and Backcountry Travel[/url] is a great place to start. This is a great forum for any of you backpacking guys. They do a pretty good job of staying on the 'cutting edge' in terms of good gear, techniques, etc. There's research that shows the size/weight of raindrops and the resultant force on tent fabric at right angles and other angles depending on the force of the wind, etc, etc. if you really want to look into it. BUT, more than likely what you are experiencing is simple condensation naturally forming (very typical given the conditions you mention) on the inside of your tent fabric, then getting knocked off of the inside of the tent fabric by the force of the raindrops and perhaps wind hitting the outside of the fabric. One of the most respected staffmembers backpackinglight.com who's experience and research is amazing has this to say as a general statement about such situations: [COLOR="RoyalBlue"]"I am going to agree with Steve here. It is extremely unlikely that falling rain could create enough hydrostatic head to push that much water through silnylon. Even torrential rain. The outside surface of the fabric gets a film of water on it which buffers the raindrops. In torrential rain the fly will cool fast, helped by the fact that the rain is often significantly colder than the ambient air. Of course, your being inside the tent with some damp clothing is going to create ideal conditions for condensation to happen within seconds. The rain on the warm ground will do the same. Take a cold bottle out of the fridge on a humid day and see how long it takes for condensation to form. It can be very fast. You will note that some people say it didn't happen to them. A distinguishing feature between the two cases is often that the 'torrential rain' is on a very still humid day, possibly warm, while the other cases are on less humid days, possibly cooler, with some wind. Taking a step back from the details, to what sort of tent is suitable. This is a subject which has been thrashed over many times here. A double skin tent (NOT a netting inner but real fabric!) is generally the recommended solution for these conditions."[/COLOR] [/QUOTE]
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