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Subject:Re: aerodynamics, was: 101 MPH Vanagon!
From:jimt
Date:Mon, 18 Oct 2004 16:20:47 -0600

On 10/18/04 3:51 PM, "Kim Brennan" <kimbrennan@MAC.COM> wrote:

> An excellent picture. Note that the Westy has significant turbulence
> over the top (the laminar lines break up almost immeadiately over the
> luggage rack). The passenger Vanagon (blue one) has pretty decent
> laminar flow. The Beige one has a popup top that causes a bit of
> turbulence.
> 
> Reading the fine print I think it says that the CD on the blue
> passenger is 0.44, on the beige popup it is 0.45. On the westy it is
> 0.51. On the Hi-top it is 0.40 (!). On the singlecab with camper it is
> 0.45. Also appears to have the varying front area too.
> 
> But not that the westy had the worse CD (and those are regular
> Vanagons, not syncros, which should have worse CD's due to increase
> ground turbulence.
> 
> 
That westy pick definitely showed what I was suspecting.
The pictures of that flat zone are what interested me most.  They definitely
accent what I was told about needing to shape the nose flat area.  The high
top being that low is because of the flow around its form.

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jimt
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