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Posted: 1/19/2009 10:16:05 AM EDT
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The reason a bullet yaws is due to the nose slowing faster than the base and the base is heavier. The 2 combine to cause it to yaw and then tumble.
Why then doesn't M855 with it's "light" steel-core snout tumble rapidly instead of having a history of late yawing? I don't get it. Someone enlighten me? |
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The bullet "tumbles" because it's not ballistically stable in the dense medium. It wants to travel center-of-gravity forward, which happens to be the base of the bullet. Then there's the variability introduced by varying angles of attack (AOA). The AOA can vary between 0 and 2.5 degrees, and contributes significantly to early/late yaw. |
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Quoted:
The bullet "tumbles" because it's not ballistically stable in the dense medium. It wants to travel center-of-gravity forward, which happens to be the base of the bullet. Then there's the variability introduced by varying angles of attack (AOA). The AOA can vary between 0 and 2.5 degrees, and contributes significantly to early/late yaw. This is why I would think that M855 would tumble the quickest, not give us 3-7" necks. |
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