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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculating bc
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<blockquote data-quote="Kevin Thomas" data-source="post: 453788" data-attributes="member: 15748"><p>FEENIX,</p><p> </p><p>A slight history correction to the info you posted from Wikipedia; The Krupp (1881) and Gavre Commision firings (1873-1898) were the first "modern" attempts to determine the effects of atmospheric resistance on the new high velocity jacketed projectiles which were coming into being at that same time frame. Interesting period for ballistic research. Anyway, these and several other studies around the world were all using a roughly similar projectile for most of their firings, a blunt (2-caliber ogive) bullet approximately 3 calibers long, around one inch in diameter and weighing approximately one pound. They were generally refered to by the name of the commision doing the firings, i.e., Krupp, Gavre, or later the newer tables based on these earlier works, such as Russia's Mayevski, or our own Ingalls models. These newer works were also based around the same projectiles used in the earlier firings. </p><p> </p><p>The problems associated with doing the workups on the entire range of different projectiles (including small arms, artillery and even bombs) wre greatly simplified witht he development of computers which could handle the tredious calculus problems involved, and that's when the work really took off. Our own Aberdeen Proving Ground developed a series of drag models for various shapes and properties during the late forties and fifties. Winchester's E.D. Lowrey published a compendium of these tables in 1965, which utilized the series of drag models we still use today; the G1, G2, G5, G6, G7, GL, etc.. The "G" used in the designation for this series was an homage to the work done by the Gavre Commision, but I'm not entirely sure who gave them the moniker. There's a good writeup of this in <em><strong>Hatcher's Notebook</strong></em>, by MG Julian Hatcher. Hatcher was the head of Army Ordnance for many years, and had something of a front row seat to many of these developments, making his perspectives particularly interesting. In that same book, he also has a complete set of Ingalls tables for calculating Ballistic Coefficients using the Ingalls' drag model. This table, incidentally, can be used with the later G1 data and BCs virtually interchangeably, with negligable errors in the final results.</p><p> </p><p>Yeah, I know, I'm a nerd, but things like the comments in Wikipedia drive me nuts!</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 453788, member: 15748"] FEENIX, A slight history correction to the info you posted from Wikipedia; The Krupp (1881) and Gavre Commision firings (1873-1898) were the first "modern" attempts to determine the effects of atmospheric resistance on the new high velocity jacketed projectiles which were coming into being at that same time frame. Interesting period for ballistic research. Anyway, these and several other studies around the world were all using a roughly similar projectile for most of their firings, a blunt (2-caliber ogive) bullet approximately 3 calibers long, around one inch in diameter and weighing approximately one pound. They were generally refered to by the name of the commision doing the firings, i.e., Krupp, Gavre, or later the newer tables based on these earlier works, such as Russia's Mayevski, or our own Ingalls models. These newer works were also based around the same projectiles used in the earlier firings. The problems associated with doing the workups on the entire range of different projectiles (including small arms, artillery and even bombs) wre greatly simplified witht he development of computers which could handle the tredious calculus problems involved, and that's when the work really took off. Our own Aberdeen Proving Ground developed a series of drag models for various shapes and properties during the late forties and fifties. Winchester's E.D. Lowrey published a compendium of these tables in 1965, which utilized the series of drag models we still use today; the G1, G2, G5, G6, G7, GL, etc.. The "G" used in the designation for this series was an homage to the work done by the Gavre Commision, but I'm not entirely sure who gave them the moniker. There's a good writeup of this in [I][B]Hatcher's Notebook[/B][/I], by MG Julian Hatcher. Hatcher was the head of Army Ordnance for many years, and had something of a front row seat to many of these developments, making his perspectives particularly interesting. In that same book, he also has a complete set of Ingalls tables for calculating Ballistic Coefficients using the Ingalls' drag model. This table, incidentally, can be used with the later G1 data and BCs virtually interchangeably, with negligable errors in the final results. Yeah, I know, I'm a nerd, but things like the comments in Wikipedia drive me nuts! [/QUOTE]
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