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Applied Ballistics for LR shooting ??s
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<blockquote data-quote="BryanLitz" data-source="post: 297787" data-attributes="member: 7848"><p>J,</p><p></p><p>More good questions!</p><p></p><p>I do plan to develop a mobile version of ballistic software, but it's not a high priority at the moment. It will probably be a winter project (now that I'm in Michigan, I'll have about 9 months of winter a year...)</p><p></p><p>When I get serious about it, you can bet I'll be on here soliciting advice from users on what features they want. I know how to write the program so it's accurate, but 'user friendly' means different things to different people, and I'll want it to be 'friendly' for as many users as possible.</p><p></p><p>LoadBase uses a Pejsa solution, which is a strange bird. The details are complex, but basically it doesn't use BC directly like conventional solutions, it converts and massages the G1 curve into something that looks more or less like a G7 or G5 curve thru the use of the retardation coefficients (the 'n' exponent).</p><p></p><p>It is safe to say that you can just use the average G7 BC as a reliable input to your software. If the output doesn't match what you see in the field, you should question some other component of the system.</p><p></p><p>Drag coefficient is a native, raw property of a projectile. Each projectile has a unique drag coefficient at each Mach number, and a unique drag curve over a given range of Mach numbers. The drag curve of a projectile is related to the drag curve of a standard projectile via the form factor. The form factor is used (along with sectional density) to calculate the BC. So form factor and BC are <em>relative quantities</em> (relative to whatever standard you're comparing to), but drag coefficient is not a relative quantity.</p><p></p><p>Clear as mud, right!</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 297787, member: 7848"] J, More good questions! I do plan to develop a mobile version of ballistic software, but it's not a high priority at the moment. It will probably be a winter project (now that I'm in Michigan, I'll have about 9 months of winter a year...) When I get serious about it, you can bet I'll be on here soliciting advice from users on what features they want. I know how to write the program so it's accurate, but 'user friendly' means different things to different people, and I'll want it to be 'friendly' for as many users as possible. LoadBase uses a Pejsa solution, which is a strange bird. The details are complex, but basically it doesn't use BC directly like conventional solutions, it converts and massages the G1 curve into something that looks more or less like a G7 or G5 curve thru the use of the retardation coefficients (the 'n' exponent). It is safe to say that you can just use the average G7 BC as a reliable input to your software. If the output doesn't match what you see in the field, you should question some other component of the system. Drag coefficient is a native, raw property of a projectile. Each projectile has a unique drag coefficient at each Mach number, and a unique drag curve over a given range of Mach numbers. The drag curve of a projectile is related to the drag curve of a standard projectile via the form factor. The form factor is used (along with sectional density) to calculate the BC. So form factor and BC are [I]relative quantities[/I] (relative to whatever standard you're comparing to), but drag coefficient is not a relative quantity. Clear as mud, right! -Bryan [/QUOTE]
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