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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet lift, does it exist?
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<blockquote data-quote="CatShooter" data-source="post: 176852" data-attributes="member: 7"><p>The problem with the theory of bullet tracking the arc (following the tangent of the path, co-axially) is the law of "Conservation of momentum" which specifically applies to gyroscopic motion.</p><p></p><p>An object that is spinning (like a bullet) has what is called "Rotational momentum"... this is kinda similar to the momentum of things moving forwards - they don't stop without changing something else.</p><p></p><p>Well, rotational momentum cases this thing called "The moment of progression", or "yaw"</p><p></p><p>People say that bullets follow the arc, but if you understand the laws of rotational momentum, you will realize that is impossible, for the following reason.</p><p></p><p>If you are behind a bullet (or gyroscope) that is rotation clockwise (like a bullet), and you try to raise the back, or lower the front, what happens IMMEDIATELY, is the nose (front) turn LEFT, the exact amount that you raised the rear or lowered the front.</p><p></p><p>If you do the math on a long range bullet, it might be launched at 3 degrees up, and a mile away, be falling at 15 degrees down... </p><p></p><p>If the theory of bullets tracking the arc was true, then the bullet would also be pointing 17 degrees to the left (from the firing position)...</p><p>... which is obviously NOT the case, because we could NOT hit anything with it if it were true.</p><p></p><p>It make no difference what the spin rate is - if the bullet attitude (direction of axis) is changes, the there is a 90 degree additional change of the SAME AMOUNT.</p><p></p><p>And there is that pesky question... Newton's Law says that there can be no change in an body's movement without an external force - where is the force to push a bullet's nose down, when in fact, the aerodynamics are trying to lift the nose, and gravity is pulling the back down cuz the center of gravity is BEHIND the center of aerodynamic drag... so the bullet wants to fall tail first, NOT nose first.</p><p></p><p>If you doubt this... go to the dime store and get a common gyroscope and play with it for a day - it will WAKE YOU UP FAST to a lot of the BS about bullets flight.</p><p></p><p>The sand marks are NOT a reliable test of attitude - only down range high speed photos can determine these things.</p><p></p><p></p><p>.</p></blockquote><p></p>
[QUOTE="CatShooter, post: 176852, member: 7"] The problem with the theory of bullet tracking the arc (following the tangent of the path, co-axially) is the law of "Conservation of momentum" which specifically applies to gyroscopic motion. An object that is spinning (like a bullet) has what is called "Rotational momentum"... this is kinda similar to the momentum of things moving forwards - they don't stop without changing something else. Well, rotational momentum cases this thing called "The moment of progression", or "yaw" People say that bullets follow the arc, but if you understand the laws of rotational momentum, you will realize that is impossible, for the following reason. If you are behind a bullet (or gyroscope) that is rotation clockwise (like a bullet), and you try to raise the back, or lower the front, what happens IMMEDIATELY, is the nose (front) turn LEFT, the exact amount that you raised the rear or lowered the front. If you do the math on a long range bullet, it might be launched at 3 degrees up, and a mile away, be falling at 15 degrees down... If the theory of bullets tracking the arc was true, then the bullet would also be pointing 17 degrees to the left (from the firing position)... ... which is obviously NOT the case, because we could NOT hit anything with it if it were true. It make no difference what the spin rate is - if the bullet attitude (direction of axis) is changes, the there is a 90 degree additional change of the SAME AMOUNT. And there is that pesky question... Newton's Law says that there can be no change in an body's movement without an external force - where is the force to push a bullet's nose down, when in fact, the aerodynamics are trying to lift the nose, and gravity is pulling the back down cuz the center of gravity is BEHIND the center of aerodynamic drag... so the bullet wants to fall tail first, NOT nose first. If you doubt this... go to the dime store and get a common gyroscope and play with it for a day - it will WAKE YOU UP FAST to a lot of the BS about bullets flight. The sand marks are NOT a reliable test of attitude - only down range high speed photos can determine these things. . [/QUOTE]
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Bullet lift, does it exist?
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