Tom,
I think they are called Flexdams and are still being made. They were real
big in the 70s. They are a good idea.
Mike
----- Original Message -----
From: "Thomas Walter" <twalter@austin.rr.com>
To: "William Schairer" <wschaibe@ucsd.edu>
Cc: <datsun-roadsters@autox.team.net>
Sent: Thursday, August 30, 2001 9:50 AM
Subject: Re: aerodynamics of racing?
> Chaperral. Yes, Jim Hall's team. Big "sucker fans" on the rear.
> If the fan, or fan drive, failed at speed the car would leave
> the track very rapidly. Something only from a Texan... ;-)
>
> Who made the "two piece" air damn's? Upper fiberglass, lower is
> stiff rubber. I found one in my closet I had forgotten about (510
> item). Hmm, actually don't even remember when I bought it. Alas,
> gave a friend a Momo steering wheel hub for his Datsun as I had
> no use for it. Guess what I also finally found... the Momo wheel,
> sans Hub.
>
> I need to clean my closets out more often.
>
> When I pulled out the carpet kit for Rodney, which went with the
> car. Suddenly I discovered I had TWO carpet kits. One for a '67
> another for a '68. I shipped both to Mike with the car, as I'll
> let him figure it out.
>
> More stuff for eBay. ;-)
>
> Tom Walter
> Austin, TX
>
>
>
> William Schairer wrote:
>
> > Wasn't there some guy, Jim Hall maybe, who designed an indy car that
> > actually sucked the air out from underneath the car to create a
> > vacuum. Even though I have never been into racing much, I remember
> > it being a big controversy. In the only race of that type I've ever
> > been to, I saw it race at Ontario back in the late 60's. The car
> > didn't finish and I think was banned the next year.
> >
> > Bill
> > San Diego
> >
> >
> >>...and the reason why that is A Good Thing is that the underside of a
normal
> >>car is a very untidy, drag-inducing kind of place. Routing the air
around the
> >>car (with a little diverted to the front brakes for cooling) reduces
> >>drag. When
> >>you get into purpose-built racing cars (Formula cars of various
> >>ilks, etc.) the
> >>smooth bottom reduces or obviates the need for an air dam. I think that
it was
> >>in F1 (or maybe indy cars - I can't remember) some years back that some
very
> >>clever fellows used specifically-shaped channels in the bottom of the
car to
> >>accelerate the flow of air under the bottom of the car, increasing its
> >>velocity, which decreases its pressure, creating a negative delta P, or
> >>downforce.
> >>
> >>Gary McCormick
> >>San Jose, CA
> >>
> >>CalSpeed@aol.com wrote:
> >>
> >>
> >>> In a message dated 8/29/01 6:08:37 PM Pacific Daylight Time,
> >>> 9laser3@bright.net writes:
> >>>
> >>> > Looking for some on line help understanding the benefits of an air
dam and
> >>> > the best way to install one on a roadster?
> >>> >
> >>> >
> >>>
> >>> The airdam redirects the air around the car rather then it traveling
> >>>
> >> > underneath. For the best airdam contact Les or Dennis at CDM.
> >> >
> >> > Calspeed
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