<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Daniel,</div><div>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. </div><div><br></div><div>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. </div><div><br></div><div><a href="https://youtu.be/Iwsf5jr1kpE">https://youtu.be/Iwsf5jr1kpE</a></div><div><br><div>Ron Soave</div></div><div><br>On Nov 19, 2017, at 7:42 AM, <a href="mailto:WeslakeMonza1330@aol.com">WeslakeMonza1330@aol.com</a> wrote:<br><br></div><blockquote type="cite"><div>
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<div><font style="BACKGROUND-COLOR: transparent" color="#000000" size="2" face="Arial">Hi Ron and list,</font></div>
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<div>I want to create a graph in Excel that shows how much power required for a
given CDa to reach a specific speed.</div>
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<div>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.</div>
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<div>The Forbes Aird Aerodynamics book includes a formulae along with a value
that I don't see referenced in the text.</div>
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<div>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:</div>
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<div>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?</div>
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<div>Thanks</div>
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<div>Daniel</div>
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