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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist vs Bullet Weight Question
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<blockquote data-quote="Hugnot" data-source="post: 2938843" data-attributes="member: 115658"><p>I liked the video - it showed CP & CM.</p><p></p><p>Then -"These bullets spin real fast (over 200 thou rpm) because the gyroscopic forces are needed to keep the bullet flying in a good point first path (no tumbling) plowing thru air (treated like a liquid) makes the center of pressure (CP) in front of center of mass (CM)"</p><p></p><p>Various projectiles used against armor have fins to maintain CP in front of CM. Pop out bullet fins with no rifling?</p><p></p><p>The Berger video uses the term "center of gravity". Calculations for kinetic energy use the term "slugs" for mass value, where the mass gravity acceleration on earth's surface is 32 ft/sec/sec. Bullets flying over the moon's surface would allow slower twists for stability.</p><p></p><p>Time for lunch & a cold beer.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2938843, member: 115658"] I liked the video - it showed CP & CM. Then -"These bullets spin real fast (over 200 thou rpm) because the gyroscopic forces are needed to keep the bullet flying in a good point first path (no tumbling) plowing thru air (treated like a liquid) makes the center of pressure (CP) in front of center of mass (CM)" Various projectiles used against armor have fins to maintain CP in front of CM. Pop out bullet fins with no rifling? The Berger video uses the term "center of gravity". Calculations for kinetic energy use the term "slugs" for mass value, where the mass gravity acceleration on earth's surface is 32 ft/sec/sec. Bullets flying over the moon's surface would allow slower twists for stability. Time for lunch & a cold beer. [/QUOTE]
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Twist vs Bullet Weight Question
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