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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
264 Win Mag VS 270 Whby
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<blockquote data-quote="Trickymissfit" data-source="post: 668204" data-attributes="member: 25383"><p>1. the actual case in the chamber becomes a pnematic gas cylinder when the charge is ignited. Speedy is right, but also slightly wrong by using the laws of fluid dynamics in his thoughts. They work slightly different. </p><p> </p><p>2. upon ignition and during the powder burn the inside of the case comes under pressure (extreme), and kind of mimics an accumulator used in a hydraulic circut (note: there are pneumatic accumulators, but not commonly used). Any piece of solid matter will move about inside the case (Ackley points this out in that chapter I spoke). Now all this is going on in milli seconds, and this is also a reason that fluid dynamics cannot apply (speed of the reaction is the issue). On the otherhand a pneumatic circut is much more reactive to pressure changes in speed and volume.</p><p> </p><p>3. Now taking the above two paragraghs and putting that together with Speedy's comments. In the world of physics and applied mechanics (we are combining both here), it is a law in physics and applied mechanics that a vector of energy will always seek the path of least resistance. The unburnt granuals of powder simply does not keep bounching around in the case. It's drawn into the barrel right behind the bullet. Why? Because the given size of the cylinder (in this case the cartridge case) is growing in volume as the bullet travels down the barrel. While this is happening the actually pressure and velocity of the gas charge is also reducing itself in an inverse proportional square. That's one reason why the throat goes long before the barrel does.</p><p> </p><p>good post by the way</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 668204, member: 25383"] 1. the actual case in the chamber becomes a pnematic gas cylinder when the charge is ignited. Speedy is right, but also slightly wrong by using the laws of fluid dynamics in his thoughts. They work slightly different. 2. upon ignition and during the powder burn the inside of the case comes under pressure (extreme), and kind of mimics an accumulator used in a hydraulic circut (note: there are pneumatic accumulators, but not commonly used). Any piece of solid matter will move about inside the case (Ackley points this out in that chapter I spoke). Now all this is going on in milli seconds, and this is also a reason that fluid dynamics cannot apply (speed of the reaction is the issue). On the otherhand a pneumatic circut is much more reactive to pressure changes in speed and volume. 3. Now taking the above two paragraghs and putting that together with Speedy's comments. In the world of physics and applied mechanics (we are combining both here), it is a law in physics and applied mechanics that a vector of energy will always seek the path of least resistance. The unburnt granuals of powder simply does not keep bounching around in the case. It's drawn into the barrel right behind the bullet. Why? Because the given size of the cylinder (in this case the cartridge case) is growing in volume as the bullet travels down the barrel. While this is happening the actually pressure and velocity of the gas charge is also reducing itself in an inverse proportional square. That's one reason why the throat goes long before the barrel does. good post by the way gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
264 Win Mag VS 270 Whby
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