[Spridgets] Power required for a given CDa to reach a specific speed.

[Ron Soave]

Daniel,
I honestly cannot remember, but the equation with the 146,000 in the denominator is the equation I am "familiar" with, meaning I remember it ;). It's too clean to be a conversion factor. I vaguely remember it being in Stokes' equation. I will look when I'm not tapping into a phone. 

By the way, the full radius stacks I mentioned were the ones you gave me years ago when I'd sent those aviation books for your brother. They were for a 45 DCOE. The stock ones were better at midrange but yours sung at high RPM. I'm pulling 8500 RPM in this video. 

https://youtu.be/Iwsf5jr1kpE

Ron Soave

> On Nov 19, 2017, at 7:42 AM, WeslakeMonza1330 at aol.com wrote:
> 
> Hi Ron and list,
>  
> I want to create a graph in Excel that shows how much power required for a given CDa to reach a specific speed.
>  
> To this I need a formulae that I can use in Excel.  I have a library of technical motoring books that puts to shame virtually any public lending library in the UK and maybe some colleges.  However, I can't find the exact details of what I need.
>  
> The Forbes Aird Aerodynamics book includes a formulae along with a value that I don't see referenced in the text.
>  
> The Colin Campbell Sports car book is about the same but with a different value I don't see referenced in the text, which is:
>  
> Drag Horsepower (I'm ignoring non-drag horsepower for now) = Coefficient of drag x frontal area x mph cubed  DIVIDED by 146,000.  So what is the value of 146,000?
>  
> Thanks
>  
>  
> Daniel
>  
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