SA08 Theory of Design

Question 1

Components of a typical grenade

Answer 1

Body
Filling
Fragmentation
Fuze cavity
Fuze

Question 2

What is a grenade

Answer 2

A grenade is a small explosive store designed for projection by hand or from a personal weapon

Question 3

Payload types of grenades

Answer 3

HE anti-pers
HEAT
Smoke.
Chemical or Irritant.
Flash or Noise composition - (Stun).
Incendiary.
Practice.
Illuminating.

Question 4

What is a defensive grenade

Answer 4

These grenades are designed for use when the thrower is protected in a defensive position. The large lethal area is achieved using fragments projected at high velocity.

Question 5

What is a offensive grenade

Answer 5

Offensive grenades rely solely on the effect of blast for their anti-personnel effect. Usual effect is to stun or disorientate a man so that he is incapable of rational reaction for a short period of time.

Question 6

Design categories of grenade

Answer 6

Hand thrown
Projected - Rifle launched/gun fired
Discharger - Weapon/vehicle launched

Question 7

What are two sections of a FFR

Answer 7

Motor
Warhead (Including Fuze)

Question 8

What is the most used warhead fitted to a FFR

Answer 8

Shape charged/HEAT

Question 9

3 factors that affect FFR accuracy

Answer 9

Surface Cross Winds
Propellant burning rate
Launcher induced errors

Question 10

What are the 2 main propellants used in FFR’s and what is the main propellant used?

Answer 10

Liquid Propellant
Solid propellant most used

Question 11

The normal type of nozzle used is a De Laval Nozzle. What is its purpose?

Answer 11

Purpose is to change heat and pressure to kinetic energy

Question 12

Types of recoiless ammunition in service

Answer 12

HEAT 551
HEDP 502
ILLUM 545
PRAC - TPT 141/552
HE 441B
Drill
Anti structural 509

Question 13

ADV of RCL

Answer 13

No recoil
Low weight
Man portable

Question 14

Dis ADV of RCL

Answer 14

Low velocity
Flash/dust signature
Large propelling charge

Question 15

Define SAA

Answer 15

Ammunition for weapons such as pistols, rifles and machine guns below 20mm in calibre

Question 16

Components of Mines

Answer 16

Warhead
Sensor & Fuze
Safety & arming unit
Power source
Case

Question 17

Sterilisation of mines

Answer 17

Self neutralisation
Self destruct
Remote controlled

Question 18

How many wedges in a 155mm WP

Answer 18

116 felt wedges

Question 19

Rates of fire for M777

Answer 19

4 RPM for 2 min
Sustained 2RPM
After 30 mins the rate of fire is dropped to 1

Question 20

3 Categories of AP mines

Answer 20

Pressure activated/direct contact AP mines
Omni-directional fragmentation AP mines
Directional fragmentation AP mines

Question 21

3 Mine laying methods

Answer 21

Hand laying
Mechanical laying
Scatterable mine laying system

Question 22

3 methods of mechanical breaching (clearing) mines

Answer 22

Flails
Rollers
Ploughs

Question 23

State the 4 main components of SAA

Answer 23

Cart case
Projectile
Primer
Propellant

Question 24

There are 4 main types of cartridge case bases what are they

Answer 24

Rimmed
Rimless
Semi-rimless
Belted rimless

Question 25

State the 3 types of ignition system

Answer 25

Integral Anvil - (BERDAN Primer). Separate Anvil - (BOXER Primer). Rimfire

Question 26

4 components of 120mm tank ammunition

Answer 26

Combustible cart case Case base & self assembly Electric primer Main charge propellant

Question 27

Fuze setting on a 120mm HE Multi-purpose round

Answer 27

Prox (Airburst) Impact (Groundbusrt)

Question 28

What is left in the barrel of a 120mm post firing

Answer 28

Steel base of case and primer tube is left behind post firing

Question 29

Sterilisation of mines

Answer 29

Self neutralisation Self destruct Remote conrtolled

Question 30

Types of 155 rounds

Answer 30

HE M107 HE M795 HE XM982 Excalibur Smart DM702A1 Illuminating M485A2 WP M826A1

Question 31

Characteristics of mortar fire

Answer 31

Illuminating Preparation Counter BTY fire Screening Covering Defensive Harassing

Question 32

Characteristics of mortar

Answer 32

Smooth Bore No recoil mechanism Muzzle Loaded Restriction to use at elevations above 800 mils

Question 33

What can a cart case be influenced by?

Answer 33

Role of the ammo Projectile design Type of weapon Ignition system

Question 34

What must a cart case be?

Answer 34

Elastic to expand to provide obturation Return to normal size for extraction Resist corrosion Strong to withstand transport and handling

Question 35

What are permanent marking on cart cases?

Answer 35

Manufacture symbol Year of manufacture Calibre Model Number

Question 36

How is an Excalibur round controlled?

Answer 36

GPS