diablopilot 2 #26 May 9, 2003 Quote The trick is that the stitch holes widen over time.... they are pulled and pulled and pulled and eventually widen and allow more air through, so you're both right for different reasons :) Thanks for pointing that out, I knew it, just didn't remember it.---------------------------------------------- You're not as good as you think you are. Seriously. Quote Share this post Link to post Share on other sites
cobaltdan 0 #27 May 9, 2003 The planform of a batwing is a glaring example of everthing taught not to do, if you want an efficient stable wing. But hey it looks cool. (btw i do have a bunch of lumps on a 116, nothing nice to say beyond: it flies....?) Sincerely, Dan <><>Daniel Preston <><> atairaerodynamics.com (sport) atairaerospace.com (military) Quote Share this post Link to post Share on other sites
billvon 3,107 #28 May 10, 2003 >Unless ZP is damaged (i.e. holes, tears) it is Zero Porosity. Ian Bellis, I believe, made some tests on various types of ZP after a great many jumps. Many of them had measurable porosity. I suppose it depends on how you define holes or tears, but for the most part, ZP does eventually degrade. Quote Share this post Link to post Share on other sites
R00tj00se 0 #29 May 10, 2003 Just a quick one to say sorry we took over your batwing thread with a ZP topic - at least it's all information. Quote Share this post Link to post Share on other sites
ianmdrennan 2 #30 May 12, 2003 Correction to the post I made previously where I mentioned I thought it did become more porous over time. I spoke to Scott Miller this weekend and asked about the porosity issue. His response was that the material is zp (at least what they're using now) for life and that the reason people think it becomes more porous is two fold. 1) As previously mentioned the stitch holes allow air to pass through more easily as they pull apart. 2) The canopy, after a few pack jobs, doesn't try to return to a particular shape. As it gets packed, sweat and oil help soften the hand (I think thats what he called it) of the canopy so it doesn't try to return to any particular shape, which is what originally gives us the impression that the canopy is "sucking" in air when it's new, and porous when it's been packed a bit. Not sure if I described that correctly (text can be hard sometimes), but thats straight from Scott. Hope this helps, IanPerformance Designs Factory Team Quote Share this post Link to post Share on other sites
