Date: Mon, 18 Oct 2004 18:21:30 -0700
Reply-To: Reinhard Vehring <rvehring@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Reinhard Vehring <rvehring@YAHOO.COM>
Subject: Re: aerodynamics
In-Reply-To: <BD99737A.4354%wetwesty@tactical-bus.info>
Content-Type: text/plain; charset=us-ascii
So why is the Westy drag coefficient so much higher
than that for the regular vanagon? Roof rack maybe?
I'm still trying to get to the source of wind noise on
my Westy. Has anyone thought about replacing the roof
rack with something more aerodynamic? Are power
mirrors better than the older versions?
Reinhard
83 Westy, "Moose"
--- jimt <wetwesty@TACTICAL-BUS.INFO> wrote:
> 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
>
> ••••••••••••••••••••••••••••••••••••••••
> 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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