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Upon expulsion from the projectile, the vanes open and orient the grenade In a vertical or near-vertical position, The energy of the vane springs and the airstream lock the two vanes in the open position and stabilize the grenade.
After the vanes are extended, yoke springs move the yoke to the extended position. The firing pin, attached to the yoke, retracts from the slide assembly, permitting movement of this assembly which locates the detonator in the armed position, A delay in arming of the grenade is provided by restricting movement of the slide assembly, This delay helps prevent premature grenade functioning caused by midair collision immediately after ejection from the projectile. Arming delay is achieved by allowing air to pass through a porous plug in the housing located adjacent to the slider recess.
When the grenade impacts the target surface, the yoke drives the tiring pin into the detonator which initiates the ejection charge. The ejection charge forces the steel ball up and away from the housing, ignites the first-fire mixture in the delay detonator, and forces the detonator into the in-line positon. The delay detonator functions the high-explosive Comp A5 at a distance of 4 to 6 feet above the impacted surface, causing the steel ball to fragment,
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