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Description: The five
vanes and vane cap are cast in one piece. The vanes are sta-ked to a
threaded collar, which fits down into the fuze body and threads onto a
striker extension collar. A closing screw with a vertically flattened head
closed the upper end of the collar. A plastic upper body is incorporated to
prevent premature firing due to collisi-on of the bomb with each other in
the air. Inside this plastic upper body, projecting through the brass
collar, are three plastic firing-pin extensions, through each of which
passes a copper shear wire. A fourth pin projects up through the center of
the striker extension collar. A detent, which is spring-loaded forward comes
up beside the striker extension collar, and while in the unarmed position,
is held down by the threaded collar of the vane cap. The detent holds the
spring-loaded detonator shutter out of line. Below the striker extension
collar is a circular plate, resting on top of the striker, which is held in
place by a shear wire. The detonator is carried in a shutter which is out of
line with the striker in the unarmed condition. The booster cup extends down
into the magazine, and has a cone in the bottom which gives it a cavity
charge effect. |
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Operation: When the
bomb is released from the plane, the safety wire is pulled and the vanes are
then free to rotate. After seven revolutions they fall away, allowing the
spring-loaded detent to move up out of the detonator shutter, which then
aligns the de-tonator under the striker. On water impact, the plastic upper
body shears away, expos-ing the four plastic firing-pin extensions. On
impact with a hard surface, one or more of these extensions shear their
shear pins and bear down against the circular plate, which transmits the
pressure to the striker. The striker shear wire is broken, allowing the
striker to be forced into the detonator. The flash from the detonator sets
off the booster. The jet from the cavity charge in the base of the booster
transmits the explosion to the ex-ploder tube in the bomb. |
