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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Textured projectiles for Enhanced Areodynamics?
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<blockquote data-quote="Kennibear" data-source="post: 914789" data-attributes="member: 51650"><p>Aerodynamically it has to do with "Reynolds Number" or in laymen's terms, scale effect. A bumble bee is hairy (or a golf ball dimpled) because that hair traps air next to its body and air on air is less friction at that scale than air on solid. The air is pretty thick to something the size of a bumblebee as compared to something the size of an airliner.</p><p></p><p>If you look at air foils you will see a big difference in shape between one used in a hang glider and one used on an airliner- different size and speed (Reynolds Number). Supersonic speeds do not have lower friction with dimpled surfaces. You could maintain the surface by using a sabot of some kind but the friction would be higher until it dropped to bumblebee speeds. Of course bullets fall at greater speed than bumblebees fly. Not much of a point then, is there?</p><p></p><p>KB</p><p></p><p>P.S. Some planes like the SR 71 Blackbird and XB 70 have their fore plane shaped to trip the sonic "boom" and allow the rest of the airplane to follow in the shadow of the supersonic shock wave. The XB 70 actually rode on this shock wave. Now that might help the bullets we shoot but would only affect the first 5% or so of the bullet's shape.</p><p>Just sayin'</p></blockquote><p></p>
[QUOTE="Kennibear, post: 914789, member: 51650"] Aerodynamically it has to do with "Reynolds Number" or in laymen's terms, scale effect. A bumble bee is hairy (or a golf ball dimpled) because that hair traps air next to its body and air on air is less friction at that scale than air on solid. The air is pretty thick to something the size of a bumblebee as compared to something the size of an airliner. If you look at air foils you will see a big difference in shape between one used in a hang glider and one used on an airliner- different size and speed (Reynolds Number). Supersonic speeds do not have lower friction with dimpled surfaces. You could maintain the surface by using a sabot of some kind but the friction would be higher until it dropped to bumblebee speeds. Of course bullets fall at greater speed than bumblebees fly. Not much of a point then, is there? KB P.S. Some planes like the SR 71 Blackbird and XB 70 have their fore plane shaped to trip the sonic "boom" and allow the rest of the airplane to follow in the shadow of the supersonic shock wave. The XB 70 actually rode on this shock wave. Now that might help the bullets we shoot but would only affect the first 5% or so of the bullet's shape. Just sayin' [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Textured projectiles for Enhanced Areodynamics?
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