pzgr40
Well-Known Member
Cutaway model of a Zt. Z 89 clockwork aeriel burst fuze. This fuze was used to open the clusterbomb container AB 500, and was also used it ignite the Photoflash bomb parachute flare LC 10.
The fuze consists of an aluminium housing which contains a clockwork, locked up by an aluminium screwed in base plate.
Time setting is between 1 -80 seconds
In top of the fuze an aluminum rotary knob (1) is placed with a slot in top and a notch at the base. This knob is used to set the desired time for the fuze.
The mechanical clock consists of a clockspring (3) loaded reduction gear (5) that unwinds as the clock is released to run down. In top of the clock a rotating disc (2) is placed with a slot and a notch. The notch hooks behind the notch of the rotary knob, allowing the rotating disc to be rotated, thus setting time. the springloaded firing pin (9) is held in armed position by a springloaded lever that wants to rotate inward but is prevented by the rotating disc (2) until the lever rotates into the slot of the disc, releasing the firing pin.
The clockspring (3) is placed in the large brass gearwheel which is connected to the brass gearwheel (4) below it on the same shaft. This brass gearwheel powers the reduction gear placed in the two brass discs (5) below it.
The clock is blocked by a spring loaded arming plunger (7) stuck through the balance wheel (8) of the reduction gear. The arming plunger (7) is kept in the lower position by a steel ball with a looped steel cord (6) attached to it. The ball is held in place by a rubber ring that also keeps the inner works of the fuze moist free. The loop of the steel cord is connected to the bomb rack of the aircraft.
Before the bomb is placed in the bomb rack the time is set by rotating the rotary knob. Upon release the bomb falls away from the bomb rack, pulling out the steel ball through the rubber ring, allowing the spring loaded arming plunger to rise and retract from the balance wheel. The clockwork now starts running until the rotatable arm of the firing pin release hook falls into the slot of the rotating disc, releasing the firing pin to move into the firing cap. The flame travels through a channel into the center hole of the base plate.
Diameter fuze flange : 58 mm
Diameter fuze body : 50 mm
Complete fuze length : 58 mm
Regards, DJH
The fuze consists of an aluminium housing which contains a clockwork, locked up by an aluminium screwed in base plate.
Time setting is between 1 -80 seconds
In top of the fuze an aluminum rotary knob (1) is placed with a slot in top and a notch at the base. This knob is used to set the desired time for the fuze.
The mechanical clock consists of a clockspring (3) loaded reduction gear (5) that unwinds as the clock is released to run down. In top of the clock a rotating disc (2) is placed with a slot and a notch. The notch hooks behind the notch of the rotary knob, allowing the rotating disc to be rotated, thus setting time. the springloaded firing pin (9) is held in armed position by a springloaded lever that wants to rotate inward but is prevented by the rotating disc (2) until the lever rotates into the slot of the disc, releasing the firing pin.
The clockspring (3) is placed in the large brass gearwheel which is connected to the brass gearwheel (4) below it on the same shaft. This brass gearwheel powers the reduction gear placed in the two brass discs (5) below it.
The clock is blocked by a spring loaded arming plunger (7) stuck through the balance wheel (8) of the reduction gear. The arming plunger (7) is kept in the lower position by a steel ball with a looped steel cord (6) attached to it. The ball is held in place by a rubber ring that also keeps the inner works of the fuze moist free. The loop of the steel cord is connected to the bomb rack of the aircraft.
Before the bomb is placed in the bomb rack the time is set by rotating the rotary knob. Upon release the bomb falls away from the bomb rack, pulling out the steel ball through the rubber ring, allowing the spring loaded arming plunger to rise and retract from the balance wheel. The clockwork now starts running until the rotatable arm of the firing pin release hook falls into the slot of the rotating disc, releasing the firing pin to move into the firing cap. The flame travels through a channel into the center hole of the base plate.
Diameter fuze flange : 58 mm
Diameter fuze body : 50 mm
Complete fuze length : 58 mm
Regards, DJH
