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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Computerized Ballistic Solutions
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<blockquote data-quote="Jeff In TX" data-source="post: 29034" data-attributes="member: 1522"><p><img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p>The Horror ballistic program, oops I mean Horus ballistic program is just plain awful. End of story!!</p><p></p><p>They use something called a C1 drag model. I have found no mention of this drag model in any of my ballistic books. I've sent them 3 emails asking them what calculations they are using and how you convert a G1, G5 or G7 BC to their C1. I've never received a response. I did down load their trial ballistic program and gave it a test drive. This has got to be one of the worst written ballistic programs ever. I pulled out my scientific calculator and took the sample bullet profile on their program and used the 100 year-old G1 drag model to see if that was what they were using. Guess what?? My calculations matched the programs exactly. Their advertised state of the art program is based on 100 year-old calculations for a 1 pound one inch round artillery shell. WOW, how accurate do you really think that's going to be!</p><p></p><p>Think of it this way. According to their ballistic program, all flat nosed, spire point, boat tail, and VLD bullets all have the exact same aerodynamic flight characteristic. There is no way to change drag models with their program. All bullets are treated and calculated the same.</p><p></p><p>Save your money on this one folks. If you want the best ballistic program written, invest in the RSI Ballistic Lab. The calculations used in this program are the exact same calculations used by the US Army at the Aberdeen Proving grounds. </p><p></p><p>And do your self a favor and stop using the G1 drag model in your current ballistic programs for your calculations. Use the G1 for Standard Flat based bullets, G5 for standard boat tail bullets, G6 for Spire Point Flat based bullets and G7 for VLD bullets.</p><p></p><p>Hope it helps</p><p></p><p>[ 10-22-2003: Message edited by: Jeff In TX ]</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 29034, member: 1522"] [img]images/icons/confused.gif[/img] [img]images/icons/confused.gif[/img] The Horror ballistic program, oops I mean Horus ballistic program is just plain awful. End of story!! They use something called a C1 drag model. I have found no mention of this drag model in any of my ballistic books. I’ve sent them 3 emails asking them what calculations they are using and how you convert a G1, G5 or G7 BC to their C1. I’ve never received a response. I did down load their trial ballistic program and gave it a test drive. This has got to be one of the worst written ballistic programs ever. I pulled out my scientific calculator and took the sample bullet profile on their program and used the 100 year-old G1 drag model to see if that was what they were using. Guess what?? My calculations matched the programs exactly. Their advertised state of the art program is based on 100 year-old calculations for a 1 pound one inch round artillery shell. WOW, how accurate do you really think that’s going to be! Think of it this way. According to their ballistic program, all flat nosed, spire point, boat tail, and VLD bullets all have the exact same aerodynamic flight characteristic. There is no way to change drag models with their program. All bullets are treated and calculated the same. Save your money on this one folks. If you want the best ballistic program written, invest in the RSI Ballistic Lab. The calculations used in this program are the exact same calculations used by the US Army at the Aberdeen Proving grounds. And do your self a favor and stop using the G1 drag model in your current ballistic programs for your calculations. Use the G1 for Standard Flat based bullets, G5 for standard boat tail bullets, G6 for Spire Point Flat based bullets and G7 for VLD bullets. Hope it helps [ 10-22-2003: Message edited by: Jeff In TX ] [/QUOTE]
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