03-23-2008, 13:57 PM
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#27 (permalink)
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Resident Mythbuster
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Join Date: 01-07-06
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Iowa Class Battleships: Their Design, Weapons and Equipment by Robert Sumrall :
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Page 79 : The deterioration affects the muzzle velocity of the projectile, producing erratic range and dispersion of the shot. For example, when the D839 was first produced in the 1940s, the original acceptance standards were +/- 10 ft/sec deviation in initial velocity. The actual variation was less than +/- 5ft/sec with the 2,700-pound projectile. During the Korean War, it was about +/- 14 ft/sec with the 1,900-pound projectile. The New Jersey's Vietnam deployment recorded about +/- 23 ft/sec with the 1,900-pound shell and on station off of Lebanon during 1984, it was about +/- 32 ft/sec using the 1,900-pound shell.
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