W33

W33 may refer to :

W33 (nuclear warhead)

The W33 was an American nuclear artillery shell, fired from an eight-inch (203 mm) M110 howitzer and M115 howitzer.

A total of 2,000 W33 projectiles were produced, the first of which was manufactured in 1957. The W33 remained in service until 1992. The warhead used oralloy as its nuclear fissile material and could be used in two different yield configurations. This required the assembly and insertion of different pits, with the amount of fissile materials used controlling whether the destructive yield was low or high. The highest-yield version of the W33 may have been a boosted fission weapon.

Disinformation or inaccurate reports

Information regarding the W33 has suggested that it was either a double gun and/or that it may have used an annular barrel assembly. The device's internal mechanism was apparently code-named Fleegle. A double gun mechanism reduces the required velocity of each projectile by half, which reduces the gun system weight by a factor of 8. An annular bore may allow a larger projectile which remains subcritical by itself (a hollow projectile has lower effective density, and critical mass scales with the square of density). Titanium was used to reduce weight of some components. Judging by the remaining photographic evidence, it is likely that the exterior casing of the artillery shell itself was made of titanium. This is logical, given that the copper-alloy driving band around the base of the shell is the only part of the shell which engages with the rifling on the artillery piece's barrel.