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FUZE, POINT INITIATING, BASE DETONATING: M539A1 |
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Filler and Weight | ||
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| NA, 0 | |||
| Body and Overall Weight | |||
| NA, 2.0 lb | |||
| Color | |||
| NA | |||
| Type of Round, DODIC | |||
| PIBD, 1390-N269 |
| Description: |
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| The fuze is based upon the principle of a piezoelectric element accumulating a charge and firing an electrical detonator housed in an arming rotor. Control-power supply M22 of the fuze includes a polarized piezoelectric element. The rotor is mounted transversal to the axis of rotation of the fuze, and is locked in the unarmed position by centrifugal detents. The rotor features a safety mechanism to return tothe unarmed position in the absence of spin or decay in spin rate, as would be sensed in case of an accidental partial arming. The switch provided in the fuze for delivering the stored charge to the detonator is the impact ball type. |
| Use: |
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| Base Detonating Fuze M539 is of the super-quick action, point initiating type used with 152mm HEAT-T-MP cartridges. |
| Functioning: |
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| The piezoelectric element immediately accumulates an electrical charge as a result of deformation during setback. The charge is bled off during peak setback by the closing of a shorting bar, and the short circuit results in an opposite charge accumulating on the element. As setback force decays, the shorting bar opens, leaving the charge stored on the piezoelectric element, as in a capacitor, Meanwhile, centrifugal force from projectile spin withdraws the rotor detents, an the rotor turns to the armed position, with the detonator in the discharge path of the static charge. Either impact on the target or deceleration from grazing will cause the impact ball switch to close and deliver the electrical charge to the detonator, thus initiating the explosive train to the projectile. If the electrical charge is lost during flight, crushing of the nose at impact will also cause the control-power supply to fire the detonator. |
| Munition Components: |
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| Data Source: |
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| TM 43-0001-28 |
| Munitions Tech Data Sheet: |
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