On Thu, Feb 18, 2010 at 8:08 AM, Craig Jungers <crjungers_at_gmail.com> wrote: > > Speaking of wing paddles: Matt Broze has a wonderful way of grounding > things > in logic. One of the things Matt triggered in me is a question of whether a > "wing" paddle actually works like a wing; with low and high pressures, etc. > Since water is, for all practical purposes, incompressible, the idea of low > and high pressure should only be considered in terms of depth. Uh, Craig, that makes no sense. For flow purposes, air is also considered to be incompressible too - until you get to near sonic speed flows. Pressure has nothing to do with compressibility. Bernoulli still applies - flows will create pressures. Let me just point out that no paddle can produce any thrust at all without a difference in pressure. It's all about how much pressure differential, and the efficiency of creating it. I'm sure you know this, but sometimes almost all of us need a reminder. *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Fri Feb 19 2010 - 00:53:49 PST
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