David, drag coefficient is a non dimensional number (typically
between 0.4 and 1.0) which is defined as
Cd=D/(0.5*rho*A*v^2)
where rho=density of air
A=cross sectional area of body (approx car height*car width)
v=air velocity
D=drag force
the simulator will be using the drag coeff to get approx values of the
drag forces on the car at different speeds. you wont really be able
to measure or calculate drag coeff for your car easily. easiest thing
to do is to get a simple physics or aerodynamics book from the
library and one will have approximate Cd values for different car
shapes and types. Use one that is close to yours.......
hope this helps
andrew
> -----Original Message-----
> From: David Costello [mailto:[EMAIL PROTECTED]]
> Sent: Monday, June 19, 2000 12:30
> To: Online Datsun Club
> Subject: confused once again
>
>
>
> this isn't a datsun specific question but can anyone tell me what
> "Coefficient of Drag" means??
>
> I've used desktop dyno to build a virtual version of my engine I'm about to
> put into my 120Y and then I've imported that information into a 1/4 mile
> simulator to see how much difference there is gunna be between the new one
> and the original
> I've got all the info in and finished except for coefficient of drag
> I have no idea what it means
>
> thanks in advance
> Dave
>
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