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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
revolutions per minute debate
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<blockquote data-quote="goodgrouper" data-source="post: 69344" data-attributes="member: 2852"><p>[ QUOTE ]</p><p> GG, I'm surprised to hear that you found conflicting info. Classical physics is well understood. </p><p></p><p>[/ QUOTE ] </p><p></p><p></p><p>Ok. I had some more time to research this today and I believe I found why the information conflicts. One report looks at the actual measurement of the RPD's in relation to the RPM's, velocity, and distance. The other report is actually looking at just the spin itself independent of the other vectors.</p><p>In other words, this is how I interpret them:</p><p>The bullet CANNOT accelerate it's actual RPD's downrange. However, it appears that it does because our method of measurement involves a measurement of distance and time and since the bullet is decelerating but keeping it's RPD's, it is revolving 1 time in a shorter distance-thus making it LOOK like it is accelerating it's RPD's.</p><p></p><p>Now, there is some very slight decrease in actual bullet revolving due to the imperfections in the skin of the bullet like my link states, but it is so slight that it can only be measured in decimal points way into the 8th or 9th place. </p><p></p><p></p><p>So what I get from this is that the bullet's twist imparted to it by the riflings is a constant for all practical purposes throughout it's traj. The way we measure it changes because it is slowing down throughout it traj. In other words, if we give the actual twist of the bullet a value of "Y", and we don't associate "Y" with any other method of measurement (like velocity, deceleration, or rate of twist) the bullet will still be maintaining "Y" at 1000 yards. </p><p></p><p></p><p>Tell me if you think this may be why it seemed like the info was conflicting.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 69344, member: 2852"] [ QUOTE ] GG, I'm surprised to hear that you found conflicting info. Classical physics is well understood. [/ QUOTE ] Ok. I had some more time to research this today and I believe I found why the information conflicts. One report looks at the actual measurement of the RPD's in relation to the RPM's, velocity, and distance. The other report is actually looking at just the spin itself independent of the other vectors. In other words, this is how I interpret them: The bullet CANNOT accelerate it's actual RPD's downrange. However, it appears that it does because our method of measurement involves a measurement of distance and time and since the bullet is decelerating but keeping it's RPD's, it is revolving 1 time in a shorter distance-thus making it LOOK like it is accelerating it's RPD's. Now, there is some very slight decrease in actual bullet revolving due to the imperfections in the skin of the bullet like my link states, but it is so slight that it can only be measured in decimal points way into the 8th or 9th place. So what I get from this is that the bullet's twist imparted to it by the riflings is a constant for all practical purposes throughout it's traj. The way we measure it changes because it is slowing down throughout it traj. In other words, if we give the actual twist of the bullet a value of "Y", and we don't associate "Y" with any other method of measurement (like velocity, deceleration, or rate of twist) the bullet will still be maintaining "Y" at 1000 yards. Tell me if you think this may be why it seemed like the info was conflicting. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
revolutions per minute debate
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