Theory of design Flashcards
What is the definition of SAA?
Ammunition for weapons such as pistols, rifles, and machine guns below 20mm in calibre
What four main parts make up a small arms round?
Cartridge case
Ignition system
Propellant charge
Bullet
The contour of the cartridge case depends on what factors?
Role of the cartridge
Type of weapon
Projectile design
Ignition system
What are the four main types of cartridge case bases?
Rimmed
Rimless
Semi rimless
Belted rimless
What are the three types of ignition systems in SAA?
Integral anvil
Seperate anvil
Rimfire
What are the four methods of securing percussion primers to cart cases?
Press fit
Ringing
Burring
Punch stabbing
What are the two main categories that projectiles fit into?
Solid projectiles
Filled projectiles
Name six ways of securing projectiles to cart cases
Press fitting Canneluring Indenting Coning Crimping Stabbing
What are the four base markings found on SAA?
Manufacturers symbol
Year of manufacture
Calibre
Model number
Colour coding for tips of SAA: Black Silver Blue Yellow Red Uncouloured
Black - AP Silver - API Blue - Incendiary Yellow - Observing Red - Tracer Uncoloured - Ball
How does a SAA round work?
Round goes in to the chamber. The bolt is locked to stop rearward movement of the case. The firing pin strikes the primer, the flame flashes through the flash holes to ignite the propellant. The propellant burns and builds up pressure and expands the cart case to provide rearward obturation. The bullet engages with the rifling and creates forward obturationThe bullet is held firmly in the cart case to ensure a high start pressure builds up before it moves up the barrel. Riffling in the barrel imparts spin. Gases are used to re-cycle auto and semi auto weapons.
Definition of a grenade
A small explosive store designed for projection by hand or from a personal weapon, special discharger or launcher
What are four types of payloads in a grenade?
HE anti pers HEAT Smoke Chemical or smoke Flash or noise composition Incendiary Practice Illuminating
What are the five main components of a typical grenade?
Body Filling Fragmentation Fuze cavity Fuze
What are the two types of HE grenades?
Offensive
Defensive
What are the three means of delivery for grenades?
Hand thrown
Projected
Discharger
What are the five components that make up a mine?
Warhead
Sensor and fuze
Safety and arming unit
Power source case
What are the three categories of mines?
Anti Pers
Anti tank
Anti helicopter
What are the three categories of AP mines?
Pressure/ direct contact
Omni-directional frag
Directional frag
FFR are made up of 2 main sections and 1 other item, what are they?
Warhead including fuze
Motor including igniter combustion chamber fins and nozzle
The Launcher
Types of FFR warheads
Nuclear HE Chem Preformed frag Sub munitions Terminally guided munitions
What factors affect the accuracy of FFR
Surface cross winds
Propellant burn rate
Launcher induced errors
Advantages of RCL?
No recoil
Low weight
Man portable
State the principle of RCL
If two weights can be fired in opposite directions at equal velocity then the weapon will be recoilless
Define a mortar
Closed metal tube designed to project a bomb into the air so that it follows a predetermined trajectory.
What are the characteristics of a Mortar?
Smooth bore
No recoil system
restricted elevation above 800mils
Muzzle loaded
Components of a mortar?
Base plate
Bipod
barrel
Sight
Name four types of mortar fire
Preparation fire
Covering fire
Defensive fire
Harassing fire
What should be worn when handling 120mm ammo?
Dry Cotton gloves
what 2 fire control systems does the M777 have?
Optical fire control system
Digital fire control system
What is left over when firing 120mm ammo?
Case base & seal assembly
Rates of fire for arty
Max 4rpm for 2 mins
sustained 2rpm
after 30mins 1rpm determined by elec thermal warning device
