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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Tractability
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<blockquote data-quote="Warren Jensen" data-source="post: 24282" data-attributes="member: 21"><p>S1,</p><p></p><p>It is not only possible to cause instability due to overspinning it happens quite a bit. Not at the muzzle but many yards down range where the increase in SF causes a dramatic precession and yaw, which can lead to instability. At the muzzle there is insufficient different between bullet's angle of attack and flight path. Downrange, past the trajectory ordinate, there can be a significant difference.</p><p></p><p>I have radar data of bullets coming apart due to insufficient structural strength at high rotational velocities. I also have radar data of instability due to overspin down range. This is from the US Army's Yuma Proving Grounds last summer during a two day test which I ran. I spent many years working the formulas and talking theory and physics. Many of my questions were not convincingly answered. It is the test range with a good doppler radar that answered these questions. You can get meter by meter data and if set up right you can even see the spin of the bullet.</p><p></p><p>You can do it, too. A day's range time at Yuma only costs about $3500, and that includes the radar. It is the breakdown of the data that is expensive, because you have to do it yourself, and it takes time. The last shoot filled two CDs or about 1.2 gigabytes.</p></blockquote><p></p>
[QUOTE="Warren Jensen, post: 24282, member: 21"] S1, It is not only possible to cause instability due to overspinning it happens quite a bit. Not at the muzzle but many yards down range where the increase in SF causes a dramatic precession and yaw, which can lead to instability. At the muzzle there is insufficient different between bullet's angle of attack and flight path. Downrange, past the trajectory ordinate, there can be a significant difference. I have radar data of bullets coming apart due to insufficient structural strength at high rotational velocities. I also have radar data of instability due to overspin down range. This is from the US Army's Yuma Proving Grounds last summer during a two day test which I ran. I spent many years working the formulas and talking theory and physics. Many of my questions were not convincingly answered. It is the test range with a good doppler radar that answered these questions. You can get meter by meter data and if set up right you can even see the spin of the bullet. You can do it, too. A day's range time at Yuma only costs about $3500, and that includes the radar. It is the breakdown of the data that is expensive, because you have to do it yourself, and it takes time. The last shoot filled two CDs or about 1.2 gigabytes. [/QUOTE]
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Bullet Tractability
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