Cartridges and projectile re-test Flashcards
What are the 3 types of QF systems?
Fixed cart (CC and projo joined)
Semi fixed (partes mated before ramming)
Separate (mated in gun)
Adv of QF sep/Semi-fixed over QF fixed = adjust charge, can replace damged cc, less stowage problems due to reduction in length)
What are the types of bagged charges
Equal cylinder
Steam and ring
Unequal cylinder
Steam and segmented
What is the definition of corrosion?
Conversion of a metal to a non-metallic state
What are the disadvantages of holt/melt fillings (casting)?
Shrinking
Cracking
Dusting
What are the requirements of a Cart Case?
Protection of contents
Easy Loading and extraction
Provide efficient obturation
Able to house a primer
Reasons why brass is used to manufacture cart cases
Non-corrosive, no abrasive particles
Reliable across equipment
Well-established metallurgy and techniques
Alloys
Alloys are metallic substances made of more than one element, typically combining various metals.
They are classified into ferrous alloys (containing iron) and non-ferrous alloys (lacking iron).
Metal
This class of elementary substances, including gold, silver, and copper, are crystalline when solid.
They are often opaque, ductile, conductive, and exhibit a distinct lustre when freshly fractured.
Where is rubber composition bitumen widely found in?
Widely used in Squash Head.
MALLEABLE
Capable of being extended by beating with a hammer or by rollers; most metals are malleable.
Different types of brass:
Cartridge Brass - 70% Copper 30% Zinc
Gilding Metal- 95% copper and 5% zinc
Admiralty Brass 69% copper, 30% zinc, and 1% tin which inhibits dezincification in many environments
In your own words define the following: IRON/COPPER
IRON: A heavy, ductile, malleable, magnetic element that occurs naturally in meteorites and most igneous rocks.
COPPER: Metallic element that is ductile and malleable and one of the best conductors of heat and electricity.
Define the term exploder
Components used for transmitting the impulse from the fuze or booster to the HE filling
What are the three benefits of the supplementry charages?
No explosive migration
Ease of removal
Setback movement eliminated
How are tracers fitted to projectiles
Externally to the base
Internally to the spigot
Grub screwed passing through tracer body
List 7 of the charge types?
Normal
Super
Reduced
Fractional
Incremental
Blank Charge
De coppering charge
Bridge Wire
- Base
- Contact piece
- Bridge
- Magazine
What are the components of a percussion primer?
- Body
- Cap
- Anvil
- Plug
- Magazine
What are the four requirements for tracer composition?
- Luminosity
- Strength
- Consistency of performance
- Ease of Ignition
What is the CWR for modern HE?
20-30%
9 Types of Carrier Projectiles:
Flare
Radar Echo
Incendiary
Illumination
Smoke
Sub Projectiles/munitions
Conventional Anti Personnel
Propaganda
Chemical
4 Methods of operation for carrier shells:
Bursting
Base Ejection
Nose Ejection (generally Anti-Pers)
Base Emission
Define Supplementary Charge:
A cylindrical aluminium container, (filled with TNT/Comp B) which is used to fill the cavity below the fuze in deep cavity projectiles. it is removed when some proximity fuzes are fitted to the proj.
3 Main benefits of supplementry charges? NES
N - No explosive migration
E - Ease of Removal
S - Setback movement eliminated
Types of Gun Systems?
Breech Loading (BL)
Quick Firing (QF)
Requirements/Design Considerations for Chargebags?
Non Smoulder
Non Stretch
Non Wear
Be insect, vermin and rot proof
Be entirely consumed on firing
Be Permeable to the flash from the tube
Advantages of CCC?
L - Less fumes
A - Ammo weight is less
N - No spent CC to be collected or extracted
N - No Cluttering at the gun sites
E - Easier to adjust charge
E - Everything loaded into the chamber plays some part in ballistics
R - Reduced Barrel Wear
6 Factors Affecting HE Shell Design?
Ballistic performance
TGT Effect
Strength to withstand firing stresses
Safe handling, transportation and storage
User requirements
Economy in manufacture
2 Purposes of tracers:
Emit light
Self destruct
