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Subject:Re: � � � Re: aerodynamics, was: 101 MPH Vanagon!
From:jimt
Date:Mon, 18 Oct 2004 13:19:54 -0600

Thankyou thankyou for that westy number.  I was just banging my head to a
pulp trying to calculate the difference of that westy top in the squares and
in the coef value.

Thanks

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jimt
Planned insanity is best.
Remember that sanity is optional.
http://www.tactical-bus.info (tech info)
http://www.westydriver.com
 
> Alistair,
> 
> Greetings from Yungay Station, Antofagasta, Chile with relative humidity of
> 1.1 to 4.2%!
> 
> Some numbers! The drag coefficient (Cd) and frontal area (A) for the regular
> Vanagon are 0.45 and 3.06 m2;
> 
> for the later Vanagon with front spoiler lip,the values are: 0.44 and 3.08
> m2;
> 
> for the Westfalia, the numbers are 0.52 and 3.17 m2;
> 
> the later Westfalia with spoiler drops the drag coefficient to 0.51.
> 
> The European hightop camper (Dehler profile) takes the drag coefficient to
> 0.40 with a frontal area of 3.61 m2.
> 
> So highest drag for the Westfalia and the Euro hightop has essentially the
> same drag as the regular passenger version.
> 
> BTW, I have info somewhere that the drag coefficient for the syncros is
> higher by about 0.03 but I can't place my hands on those notes just now.
> 
> 
> Frank (Grunthaner)
> 
> This data comes from VW factory wind tunnel tests, conducted as they worked
> out the optimal gearing for the various powerplant combinations.
> 
> Pleased to see some technical discussion on the list!
> 
> 
> Frank Grunthaner
> 
>

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