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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New Formula for Gyroscopic Stability of Open Tipped Match Style Rifle Bullets
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<blockquote data-quote="Michael Courtney" data-source="post: 910742" data-attributes="member: 28191"><p>There are important differences between Sg (gyroscopic stability) and dynamic stability. If a bullet has gyroscopic stability when it leaves the muzzle, it will maintain gyroscopic stability at all ranges, as Litz describes in his book on applied ballistics.</p><p></p><p>Dynamic stability is different, as shown in the figure attached for the M855 bullet. </p><p></p><p>Inferences regarding dynamic stability should not be made from Sg values. Some references on dynamic stability:</p><p></p><p><a href="http://www.dtic.mil/ndia/2011ballistics/11894.pdf" target="_blank">http://www.dtic.mil/ndia/2011ballistics/11894.pdf</a></p><p></p><p><a href="http://www.arl.army.mil/arlreports/2010/ARL-TR-5182.pdf" target="_blank">http://www.arl.army.mil/arlreports/2010/ARL-TR-5182.pdf</a></p><p></p><p><a href="http://www.fulton-armory.com/faqs/Genl-FAQs/Fly/longr.htm" target="_blank">http://www.fulton-armory.com/faqs/Genl-FAQs/Fly/longr.htm</a></p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 910742, member: 28191"] There are important differences between Sg (gyroscopic stability) and dynamic stability. If a bullet has gyroscopic stability when it leaves the muzzle, it will maintain gyroscopic stability at all ranges, as Litz describes in his book on applied ballistics. Dynamic stability is different, as shown in the figure attached for the M855 bullet. Inferences regarding dynamic stability should not be made from Sg values. Some references on dynamic stability: [url]http://www.dtic.mil/ndia/2011ballistics/11894.pdf[/url] [url]http://www.arl.army.mil/arlreports/2010/ARL-TR-5182.pdf[/url] [url]http://www.fulton-armory.com/faqs/Genl-FAQs/Fly/longr.htm[/url] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New Formula for Gyroscopic Stability of Open Tipped Match Style Rifle Bullets
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