Date:         Fri, 3 Sep 2004 13:50:31 -0400
Reply-To:     vw4x4@FYI.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Eric Zeno <vw4x4@FYI.NET>
Subject:      Re: vanagon top speed, extrapolation
Comments: To: Alistair Bell <albell@UVIC.CA>
In-Reply-To:  <5B9DB6A4-FDCD-11D8-9596-000A95E94AAC@uvic.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Right..... but what if you have a 100 MPH
tail wind and your going down hill!  This is
how I did over  100.   Tail wind was strong
but maybe not 100 MPH..
   Waht I would like to no is how he knows
the speed, as the vanagons speedos do  not
go up that high.... sounds fishy.
                       ERic


Alistair Bell wrote:

> I posted M. Jagersand's speed vs power data set the other day.
>
> here it is again and with my quick and dirty extrapolation to 50 m/s
>
>
> Martin's data:
>
>  Speed (m/s)  Total drag (kW)
>       ----------------------------
>          15.00         -7.99
>          20.00        -19.69
>          25.00        -34.74
>          30.00        -53.15
>
> Extrapolation:
>
> 35.000  -76.50
> 40.000  -103.63
> 45.000  -134.59
> 50.000  -168.00
>
>
>
> Converted into Imperial units:
>
> Speed (mph)     Total drag (hp)
>
> 33.67           -10.72
> 44.89           -26.41
> 56.11           -46.59
> 67.33           -71.25
>
> 78.55           -102.59
> 89.78           -138.00
> 101.00          -180.49
> 112.22          -225.29
>
>
> So roughly, and I do mean a rough estimate, to go 112 mph in a Vanagon
> one needs around 225 hp at the driving wheels.
>
>
> I have to restate that this is an estimate, no doubt off by a bit, but
> it gives one an idea of the power involved.
>
>
>
> Alistair
>
> '82 westy, diesel converted to gas in '94
>
> http://www.members.shaw.ca/albell/
>
>