----- Original Message -----
From: "Chuck Voboril" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, February 09, 2007 10:28 PM
Subject: Re: [F500] new body for KBS and Q-cars
Chris,
Sure CFD is used heavily, I'm just pulling your leg a little.
The point is that CFD is a just another tool or design aid. It has its
limitations. Berkley Spice models analog electical circuits really
well-been around for 20 years. I used to use it when all we had were main
frame computers for it to run upon. However, bench time is STILL
necessary today to get most stuff to work as intended.
Our thermal engineers use a very high priced CFD package at the place I
work for heat flow modeling in our spacecraft designs. They start with a
Pro-E or Solidworks 3D mechanical drawing just like with a race car. It is
a big help but it only gets one so close to reality. No modeling tool
minimics nature perfectly. Ferarri and Boeing also use CFD applications
that you and I will never be able to afford.
In fact, we would probably not even be able to afford 1 year's factory
support of the software for bug fixing and help with cockpit errors in
using it.
Racers still do amazing things without software tools.
There is a classis picture of Frank Costin in his suit, tie, and black
shoes where he is strapped flat to the front fender of a car so he can
observe the behavior of wool tufts at speed up close :->
Chuck
From: Chris Reinhardt <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: [F500] new body for KBS and Q-cars
Date: Fri, 9 Feb 2007 16:04:27 -0800 (PST)
Chuck, I know that they can and do design entire aircraft without using
wind tunnels, I'm sure that with the software out now, they can design
and test race car bodies.
CR
Dave Craddock <[EMAIL PROTECTED]> wrote:
Chuck ,you obviously know Ted James,he and Nancy are most acomplished
racers,I'm curious how he measured the results he got?
Dave Craddock
----- Original Message -----
From: "Chuck Voboril"
To:
Sent: Friday, February 09, 2007 5:51 PM
Subject: Re: [F500] new body for KBS and Q-cars
> Chris,
> CFD is still in its infancy. Honest.
> CFD only gives you clues about portions of a car shape.
>
> One has to go back and forth between track measurements and CFD CAD
> modeling to get it fairly right.
> and if you have the resources, between wind tunnel tests, too.
> Wind tunnel work will still probably get a company to an optimum design
> far before someone w/out one whoonly has CFD.
> New wind tunnels are still being built.
>
> As an example-Ted James, who bought the latest Stohr WF-1, has
discovered
> it makes less measured DF than his old AMAC that he had tweaked and
> tweaked upon for years.
>
>
> Chuck
>
>
>
>
>
>>From: Chris Reinhardt
>>Reply-To: [email protected]
>>To: [email protected]
>>Subject: Re: [F500] new body for KBS and Q-cars
>>Date: Fri, 9 Feb 2007 14:32:56 -0800 (PST)
>>
>> Chuck, if you have some really good fluid dynamics software, there's
>> no
>> need for a wind tunnel, Lee does...
>>
>> CR
>>
>>Chuck Voboril wrote:
>> I might add that the dominant Stohr DSR's have never seen the inside
>> of
>> a
>>wind tunnel either.
>>This F500 design passes the aero "eyeball" test as well as any.
>>
>>
>>Chuck Voboril
>>
>>
>>
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