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I found this article last night when searching for info comparing flex and rigid pipe, specifically air flow restriction. This looks like a good experiment showing how the 2 compare. Net-net is that for fully stretched flex, it is about the same as rigid. At increasing levels of compression or deformity though it gets MUCH worse.
http://www.mmmfg.com/pdfs/060601_CC-...tTechPaper.pdf
Last edited by JohnT Fitzgerald; 06-09-2011 at 11:17 AM.
I wondered why the baseball was getting bigger....then it hit me.
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This experiment was obviously set up to study forced air heating and cooling systems. Considering one works on positive air pressure and the other on negative air pressure, I wonder how much pushing the air through the pipe would make a difference as opposed to pulling it through with respect to turbulence that is generated by the uneven surfaces and bends in the pipe; which is what dust extraction is more concerned with.
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