Bingo.
----- Original Message -----
From: "Martine Boudreault" <martine.boud@VIDEOTRON.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, August 17, 2005 2:33 PM
Subject: Re: How much fuel efficiency gained by shedding 300 lbs?

> If the theory of "wind resistance" vs "weight" is correct, I should not
have
> a 20" high plastic box on top of my van?
> Any comments on large object we may have on top of the front cabin?
Should
> a small trailer replace such box that increase the wind resistance?
> joel
>
>
> -------------------------------------------
> so then the 2 conditions that must be met are:
>  - same shape
>  - same surface area
>
> correct?
>
> If so, I would argue that no 2 cars models have those in common and thus
> the wind resistance for each car is unique. As a result, no one magic
> formula can accurately account for how fuel inefficient all vehicles are
> unless it includes some kind of unique variable specific to that model of
> vehicle.
>
> as a side, I think what you meant to say was that the density of an object
> has no bearing on it's wind resistance. Which is true. However the higher
> the density the more energy it will take to change it's relative position
> i.e. - Accelerating from 0 to 65 MPH
>
>
> > I think he meant, a 6 ton flat brick has the same wind resistance as a
> > 200g flat brick. ;)
> >
> > On 8/17/05, Brandon <Brandon@concilio.ca> wrote:
> >> so by that logic a 1 pound Tear dropped shaped object has the same wind
> >> resistance as a 6 ton flat brick.
> >>
> >> note: our vans more closely resemble the brick :)
> >>
> >>
> >> > My goodness you guys, nobody is thinking, and I can't sit quietly any
> >> > longer!
> >> >
> >> >  The mass of the vehicle does not change the wind resistance, or the
> >> MPG,
> >> > on
> >> > the highway. Stop and go or big hills is another story, but on flat
> >> ground
> >> > at steady speed the van could be 6 tons and you'd get the same MPG.
> >> >
> >> > At steady speed you are not accellerating the mass, you are only
> >> pushing
> >> > the
> >> > wind out of the way, so mass doesn't matter.
> >> >
> >> > John
> >> > Aircooled.Net Inc.
> >> >
> >> >
> >>
> >
> >
>