6. Fuzes Flashcards

Question

Graze Action Fuzes

Answer 1

The interior mechanism of graze action fuzes is so arranged that when the projectile is checked in flight or receives an appreciable deceleration  A moveable part, usually called the graze, inertia pellet or plunger moves forward to carry the detonator on to the needle (or vice versa). A creep spring keeps the two apart until this deceleration is experienced  Graze fuzes have a small inherent delay

Answer 2

These fuzes usually have a masking shutter, interrupter or pyrotechnic composition in built into the detonating train between the initiator and the fuze magazine so there is a slight delay between the actuation of the initiator and the firing of the magazine. This may be achieved by channelling the flash from the initiator around a longer route or slowing it by having to wait for the pyrotechnic composition to burn through before it reaches the next component.

Answer 3

Point Detonating Fuzes (PD) -Fitted in the nose of projectile and normally shaped to conform to contours of projectile.  Point Initiating Base Detonating Fuzes (PIBD) -Consist of initiating assembly in nose of projectile and fuze in base.  Base Detonating Fuzes (BD) -Situated in base of projectile, cylindrical in shape.

Answer 4

Proximity fuzes are automatic time fuzes, - with or without PD element, - (that are) designed to function a projectile at the optimum lethal distance from the target, - provided that in the case of aircraft targets, the trajectory passes sufficiently close.

Answer 5

``` Proximity Fuze: A fuze that reacts to the proximity of the target and detonates the shell.  Variable Time (VT) WW2 term for Proximity  Electric Fuze old US term for Proximity  Multi Option Fuze e.g. M734 –Proximity –Superquick –Delay –Near Surface Burst ```

Answer 6

Variable Time (VT) Timer section arms the fuze electronically after firing. Controlled Variable Time (CVT) Can be set to activate the Prox function after a set time.

Answer 7

Radio waves are emitted by the fuze, some of the waves are reflected and picked up by the receiver  The time taken to return affects the Reflected waves, which interfere with the radiated waves to give a beat known as the Doppler effect  As the fuze gets closer to the set target distance the impulses increase to a defined peak value and the fuze functions

Answer 8

SHDD Sunlight Heat Dampness Drop / Strike - Stored nose down

Answer 9

``` Electronic fuzes are functioned by a current passing through electric leads from some sort of battery  Power Sources: –Battery –Turbine generated –Precharged –Electostatic ```

Answer 10

```  Rugged  Economical  Able to function in all conditions  Light weight Safe to handle  Not easily jammed  Able to fit existing projectiles  Sensitive and rapid in operation Have good storage characteristics  Not subject to false operation ``` Have good storage characteristics

Answer 11

SSDCSBSH Shear wire STRIKER SPRING and spring disc Detent/setback pin Centrifugal balls Stirrup Spring & ferrule. (3-part sleeve) BORE riding pins. (on outside of fuze) Safety pins, Cotter and PULL pins Horse head segments. (2 pivoted segments)

Answer 12

- The component which provides the stimuli to initiate the explosive train - It may be achieved either mechanically or electrically *Electrical - Bridge wire, Exploding Bridge wire, Conducting cap

Answer 13

Unlocking components by SET BACK Easing it onto its seating on CREEP FORWARD Swinging it into position via CENTRIFUGAL FORCE Initiation of the train via SET FORWARD

Answer 14

-Combustion fuzes rely on their timing on the burning of a train of pyrotechnic comp. -Embody a clockwork mechanism which is actuated by setback forces on firing -Uses the latest microchip tech, can be set from 1-199secs

Answer 15

- Cannot be assembled in an unsafe condition | - safety arrangements can be checked during and after assembly

Answer 16

Rotation Fuze Key Fuze Setter Fuzing setting machine

6. Fuzes Flashcards

(40 cards)