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Old Nov 3rd 2016, 12:41 AM   #1
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Ballistic Coefficients

Hi all.

I am interesting in learning more about ballistic coefficients. I understand the basics as described on this wiki link:

https://en.wikipedia.org/wiki/Ballistic_coefficient

Just to provide an in page review of the formula itself:



What I am wanting to know, is how to actually use this formula in examples, if possible, and whether or not you can calculate the coefficient of drag with just shape and obviously likely calculus.


I hope my post was clear and made sense.
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Old Nov 3rd 2016, 04:53 AM   #2
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I don't know that you use the BC for anything other than comparing one projectile against another to see which is more "efficient."

As for determining Cd: it can be estimated using computer models or measured with a test in a wind tunnel. There are some data for various standard shapes that have been empirically determined over the years, but an object's Cd depends on more than just shape - it is highly affected by the roughness of the projectile's surface.
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Old Nov 3rd 2016, 05:30 PM   #3
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Thanks for the reply Chip.

You basically answered all of my questions.
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