Projectiles and cartridges Flashcards
What are the types of natural fibres?
Cellulose
Silk
Wool
Rubber
What are the 2 main types of plastics used?
Thermo plastic - can be reheated and re-shaped
Thermosetting plastic - incapable of being softened by heat
What are the 2 main types of metal defects?
Mechanical
Chemical
What are the types of corrosion?
Rust (ferrous oxide) aluminium oxidation Mazak contamination Cupric Azide Zinc Exudation
What are the four filling techniques?
Casting
Pressing
Extruding
Pre-forming/ cocooning
What are the principles requirements of Tracer ammunition?
Luminosity
strength
consistency of performance
ease of ignition
What are the functions of the driving band?
To centre the projectile in the bore and impart spin
To prevent the forward escape of propellant gases
To assist in prevention of slip back of the projectile when loaded at high elevations
What are the requirements for a driving band?
No excessive pressure on the shell or barrel
Cater for change in bore diameter
Remain firmly attached to the projectile
Must not alter the ballistic shape of the projectile
cause no excessive friction or bore wear
simple to make and fit
What are the methods of preventing twisiting
wavy rib and knurling
What are slipping bands used for?
Slipping rings are designed to ensure that the spin
imparted by the weapons barrel does not reach a
rate that would influence the fin stabilisation of a
projectile or would reduce the effectiveness of a
hollow charge
How is separate ammunition loaded into a breech loaded system?
projectile and charge bags are loaded into chamber of the gun. The breech is closed to provide obturation.
a tube or primer is loaded into the breech
What are the 4 types of bagged charges?
Equal
Unequal
Stem and ring
Stem and segment
Two common RCL designs
Solid cart case with blow out rear disc
Perforated cart case system
Components of BL system
Tubes
Bagged charges
Projectile
Components of QF system?
Cart case and primer
Propelling charge
Projectile
What are the requirements of the cart case?
- Protect contents
- Easy loading and extracting
- Provide efficient obturation
- Able to house a primer
Explain the blow out disc system
Pressure builds
Disk ruptures
Projectile propelled forward
Propellant gasses escape through breech hole and out Venturi
Explain the Perforated cart case system
Prop gasses escapee through holes in cart case
into annular space
Out through Venturi
What’s copper used for?
Driving bands Detonators Shape charged liners Cart cases SAA jackets
3 tracer classifications
Tracer projectile
Tracer and igniter projectile
Integral tracer
Methods of attaching cart cases to projectiles
Coning
Canneluring
Coming and canneluring
3 methods of HE shell design
Cast
Forged
Extruded
Classifications of projectiles?
Operational projectiles
Weapon functioning
Training projectiles
Advantages of CCC
- Everything loaded into chamber plays some part in ballistics
- Reduced barrel wear
- reduced cook off with low charges
- less produce left over
Why use brass?
Performs well in most equipment
Metallurgy and techniques are well known
- does not corrode to give hard abrasive particles
Methods of sealing tracer
Brass or celluloid discs or cups
NG and carbamite
Bakelite discs
Types of primers
Percussion
Electric - bridge wire, conducting cap
Sup charges contained in metal provide what 3 main benefits?
Ease of removal
Setback movement eliminated
No explosive migration
Define the term exploder
The components used for transmitting the impulse from th fuze or booster to the HE fill
Define carrier projectile
Projectile body is used as a vehicle to deliver payload to target area.
The projectile itself plus little or no part in achieving the target effects
