Fuzes Flashcards
What is the definition of a fuse?
A fuse is a device designed to function an item of ammunition under pre determined circumstances
Fuses are classified according to what three categories?
Filling
Position
Function
Define the following: PD BD PIBD T CT MT VT CVT SQ DLY MTSQ TSQ PDSQ MO ET
Point Detonating Base Detonating Point Initiating Base Detonating Time Combustion Time Mech Time Variable Time Controlled Variable Time Super Quick Delay Mech Time Super Quick Time Super Quick Point Detonating Super Quick Multi Option Electronic Time
What are the two requirements of a fuse?
Safety - for storage and transport
- against pre mature function
Reliability - function when required
One of the other requirements of a fuse is that it fits the fuse cavity, name five more?
Standard weight Optional delay setting Multi role to minimise refusing Minimum preparation for use Easy time adjust setting
One mechanical device is a Shutter, name three more.
Delay arming shutter Masking Horse head segments Bore riding pin Centrifugal balls
Explain when a fuse is armed.
A fuse is armed when it has gone through all of it’s firing forces and the explosive train is inline..
Explain the following: Setback Stored energy Creep forward Centrifugal force Set forward Spin decay Air/gas pressure
Setback - Rapid acceleration forcing momentum rearwards
Stored energy - energy ready to be released (spring under tension)
Creep forward - After setback and the momentum starts to decelerate, moving parts return to a forward position
Centrifugal force - momentum moves outwards due to a rapid spinning motion
Set forward - violent deceleration on impact
Spin decay - decrease in angular velocity
Air/gas pressure - used to drive a turbine to generate power in electrically operated fuses
What are the four Impact fuse actions?
Super quick
Non delay
Graze
Delay
What are the categories of impact fuses?
PD
BD
PIBD
How does graze sensitive work?
Functioned when checked in flight or receives appreciable deceleration, a movable part called the graze or inertia pellet moves forward to carry the detonator on to the needle or vice versa. A creep spring keeps the two apart. The detonator is a flash type and the fuse has a small delay
What are boosters made of and what are they for?
CE pellet
Carries the explosive wave from the detonator and transfers it to the main fill
What are the three types of time fuses?
Combustion time
Mechanical time
Electronic time
What are the three types of mechanical time fuses?
Dixi - Swiss fuze
Junghans - American MT Fuzes
Thiel - British MT Fuzes
Describe the Doppler effect.
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
