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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Coriolis effect
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<blockquote data-quote="Brown Dog" data-source="post: 29321" data-attributes="member: 1622"><p><BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR> I guess another way to think of it is, those velocities would only be unaffected if you fired the shot dead verticle at which time the projectile would act like a geo-synchronous sattelite and fall right back on the shooter. It would continue to rotate at exactly the same speed as the earth, then gravity would set in and bring it straight back down to the same spot. (regardless of the latitude) <HR></BLOCKQUOTE></p><p></p><p>Oh no it wouldn't!</p><p></p><p>As with coriolis, you have to think in terms of vector velocities. A projectile fired vertically would actually land to the west of the firer!</p><p></p><p>Prior to firing it only has the vector velocity imparted to it by all the things holding it in place in the rifle's chamber at that spot on the Earth. Let's say that spot on the Earth is a radius of X from the Earth's centre. If it is fired vertically, I hope it is obvious that the horizontal component of its vector velocity remains as it was prior to firing. Vertical firing has only given it a vertical component. At any altitude (or radius in this example) greater than X it will have an insufficient horizontal component to maintain a 'geo-synchronous' position and -in effect- the Earth's surface will leave it behind.</p><p></p><p>This phenomenon is known as 'Projectile Lag'. </p><p></p><p>The more astute among you will note that Projectile Lag can negate, contradict or add to the effects of Coriolis depending on circumstance.</p><p></p><p>If anyone on this site is <strong>shoulder- firing</strong> a weapon that is affected, in measurable amount, by either coriolis or projectile lag I suggest they stay away from Kryptonite!</p></blockquote><p></p>
[QUOTE="Brown Dog, post: 29321, member: 1622"] <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR> I guess another way to think of it is, those velocities would only be unaffected if you fired the shot dead verticle at which time the projectile would act like a geo-synchronous sattelite and fall right back on the shooter. It would continue to rotate at exactly the same speed as the earth, then gravity would set in and bring it straight back down to the same spot. (regardless of the latitude) <HR></BLOCKQUOTE> Oh no it wouldn't! As with coriolis, you have to think in terms of vector velocities. A projectile fired vertically would actually land to the west of the firer! Prior to firing it only has the vector velocity imparted to it by all the things holding it in place in the rifle's chamber at that spot on the Earth. Let's say that spot on the Earth is a radius of X from the Earth's centre. If it is fired vertically, I hope it is obvious that the horizontal component of its vector velocity remains as it was prior to firing. Vertical firing has only given it a vertical component. At any altitude (or radius in this example) greater than X it will have an insufficient horizontal component to maintain a 'geo-synchronous' position and -in effect- the Earth's surface will leave it behind. This phenomenon is known as 'Projectile Lag'. The more astute among you will note that Projectile Lag can negate, contradict or add to the effects of Coriolis depending on circumstance. If anyone on this site is [B]shoulder- firing[/B] a weapon that is affected, in measurable amount, by either coriolis or projectile lag I suggest they stay away from Kryptonite! [/QUOTE]
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