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Maximum projected areas and dimensions of cavities. |
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|  MIL-C-64037 (AR)
3.7.2
Duds.
The cartridges shall function on impact.
3.7.3 Short rounds. No cartridge shall have a horizontal
range less than 80 percent of the average horizontal range when
calculated without the short rounds.
3.7.4 Premature burst. There shall be no premature burst
in the gun bore or in the flight.
3.7.5 Metal parts separation. There shall be no metal
parts separation in the gun bore or in flight.
3.7.6 Range precision. The horizontal range standard
deviation shall be no greater than 11 meters when fired at
charge zero, no greater than 55 meters when fired at charge two
and no greater than 75 meters when fired at charge four.
3.8
Cavitation in high explosive charge (see 4.5.3).
3.8.1 General. Cavities having a maximum (max) projected
dimension of 3/32 inch or less shall be disregarded provided
that they are separated by 1/2 inch or more of solid explosive.
3.8.2 Maximum projected areas and dimensions of cavities.
The aggregate of the projected area of all cavities shall not
exceed 1 square inch and no individual cavity shall exceed 1/2
square inch. Cavities located in the area of the charge which
extends from the base of the fuze well to 2.5 inches below the
base of the fuze well shall not exceed 3/4 inch in any
direction and their aggregate projected area shall not exceed
5/8 square inch.
3.8.3 Piping cavity. A piping cavity on the longitudinal
axis of the projectile shall be permitted provided that its
projected length does not exceed 1 1/2 inches and its width
does not exceed 1/4 inch. The projected area of such a cavity
shall not be included when determining cavity area in the
charge.
3.8.4 Cracked charges and annular rings. Not more than
four transverse cracks shall be permitted in any charge. The
cracks shall be no wider than 1/32 inch. Longitudinal cracks
shall be disregarded. The presence of annular rings with a
projected width of 1/16 inch max. and extended from the shell
wall 1/4 inch max. into the charge shall not be cause for
rejection.
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