DS - GW Basic Bricks

Question 1

Classifications of GW (4+2)

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Answer 1

Strategic / tactical
Surface-to-Air (SA)
Air-to-Surface / Ground (AS/AG)
Air-to-Air (AA)

Anti-Shipping Missile (ASM)
Anti-Missile Missile (AMM)

Question 2

Definitions of Guided Weapons

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Answer 2

A weapon system in which the warhead is delivered by an unmanned guided vehicle

Question 3

Name the Basic Bricks (7)

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Answer 3

• Structure
• Propulsion
• Guidance
• Control
• Auxiliary power
• Payload (“armanent”)
• Fuzing (“armanent”)

Question 4

2 Parts of Structure

Answer 4

Airframe

Skin

Question 5

What is the purpose of the skin on a guided

weapon? (3)

Answer 5

• Gives Aerodynamic Shape
• Protects Internal Parts
• Adds to Rigidity and Stability of Missile

Question 6

Forces Acting on GW (7)

xx

Answer 6

• Vibration & resonance
• Aerodynamic Lift
• Aerodynamic Heating
• Acceleration Loads
• Thrust Loads
• Transportation Loads
• Drag/Dynamic Pressure

Question 7

Define missile guidance.

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Answer 7

The ability to alter the direction of the flight of a missile after launch and able to do so until it is close to the point of impact

Question 8

What are the three components of a guidance system?

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Answer 8

Tracking device
Computing device
Directing device

Question 9

Name five types of guidance - Predetermined Guidance.

Answer 9

Preset Guidance
Inertial Guidance
Terrestrial Reference
Radio navigation
Celestial navigation

Question 10

What are the three types of homing guidance?

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Answer 10

Active homing
Semi active homing
Passive homing

Question 11

What are the three phases of guidance?

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Answer 11

Launch phase
Mid course phase
Terminal phase

Question 12

What is the purpose of the directing device

Answer 12

Means by which commands are sent to the missile

eg radio, radar, wire and laser beam

Question 13

The propulsion system requirements? (4)

xx

Answer 13

Accelerate the missile from rest

Provide sustained thrust or adequate momentum for missile to reach its maximum range

Provide a consistent level of thrust under all conditions

Not interfere with the guidance or control system

Question 14

What is propulsion?

Answer 14

That part of the missile which provides the power to move it from launch to target

Question 15

A guided missile must travel at a high speed in order to do what 3 things?

Answer 15

• Overtake and destroy a threat
• Avoid enemy countermeasures
• Reduce the time the missile is subject to atmospheric disturbances

Question 16

What is jet propulsion?

Answer 16

A method of propelling a body by means of the reaction force produced by the discharge of matter from the propelled body

Question 17

What are the two main functions performed by the nozzle on jet engines?

Answer 17

• Restrict the volume of gas flow to keep internal pressures high
• Convert heat energy of expanding gases into kinetic energy

Question 18

What are the two basic types of engine?

Answer 18

• Air dependent (jet)– atmospheric air is being used as the oxidiser
• Air independent (rocket) – own oxygen is carried on board

Question 19

What are types of air dependent engines?

Answer 19

• Ramjet – diffusers
• Turbojet – compressor
• Pulse jet – flaps

Question 20

What are the two main categories of air independent engines?

xx

Answer 20

• Liquid fuelled

* Solid fuelled

Question 21

What are the three phases of guidance missile propellant burning?

Answer 21

• Boost phase
• Sustainer phase
• Coast phase

Question 22

Disadvantages of Guided Weapons? (6)

Answer 22

Cost
Reliability
Response time
Minimum range
Flight time
Back-up

Question 23

Types of Controlled path guidance?

Answer 23

Command guidance
- Command to the Line of sight - manual
- Command off the Line of sight
Beam riding

Question 24

Different Homing target approaches?

Answer 24

• Pursuit course
• Constant bearing
• Proportional navigation

Question 25

What is meant by the term "compound guidance?"

Answer 25

Using different types of guidance for different phases of trajectory of guided weapon

Question 26

What is auxiliary power

Answer 26

All power required by missile in flight, other than the propulsive power

Question 27

Main types of Auxiliary Power (3) xx

Answer 27

Electrical Pneumatic Hydraulic

Question 28

Aux power - Sources of pneumatic power (3)

Answer 28

Compressed air or gas Propellant gases Ram air

Question 29

When is hydraulic power preferable to other forms of auxiliary power?

Answer 29

When the components such as actuators operating control surfaces are subject to other high aerodynamic or high acceleration forces

Question 30

Two types of hydraulic systems

Answer 30

One shot system Recirculatory system

Question 31

What is propulsion?

Answer 31

Part of the missile which provides power to move it from launch to target

Question 32

To measure effectiveness, guided missile must travel at a high speed IOT do what 3 things?

Answer 32

Overtake and destroy a threat Avoid enemy countermeasures Reduce the time the missile is subject to atmospheric disturbances

Question 33

What is jet propulsion?

Answer 33

A method of propelling a body by means of the reaction force produced by the discharge of matter from the propelled body

Question 34

3 phases of GM propellant burning?

Answer 34

- Boost phase - Sustainer - Coast

Question 35

2 types of sensors used in GM? | xx

Answer 35

- Gyroscopes | - Accelerometers

Question 36

2 types of gyroscopes? | xx

Answer 36

- Free gyroscope | - Rate gyroscope

Question 37

What is an Accelerometer?

Answer 37

Determines the rate of change from a reference axis

Question 38

How many accelerometers are required for complete stabilization?

Answer 38

3 | axes?

Question 39

What is a pick off?

Answer 39

Device that produces an electrical signal due to the mechanical movement of reference

Question 40

What are two basic types of pick off?

Answer 40

- Variable resistance | - Variable reluctance

Question 41

What is the purpose of the electronic control unit (ECU)?

Answer 41

It receives a signal from the sensors that (the GM) requires correcting, then it processes the info and amplifies the signal to be sent to the servo motor......?

Question 42

What are the types of ECU? (3)

Answer 42

- Amplifiers - Controllers or Shaping elements - Mixers

Question 43

What are the main components of a servo mechanism? | xx

Answer 43

- Transducer - Control Valve - Actuators

Question 44

What do control devices do?

Answer 44

Produce the change in direction of the airframe

Question 45

What are the 2 basic principles that affect control?

Answer 45

- Aerodynamic control | - Thrust vector control

Question 46

What is an aerofoil?

Answer 46

Body shaped for aerodynamic reaction without excessive drag

Question 47

What is a fin?

Answer 47

Aerofoil attached to provide directional stability

Question 48

What is a wing?

Answer 48

Aerofoil attached to missile to provide lift

Question 49

What is a control surface?

Answer 49

Aerofoil attached to GM to change attitude of GM

Question 50

What is a canard?

Answer 50

Configuration where control surfaces are forward of main support surfaces

Question 51

What is twist and steer?

Answer 51

Roll stabilization by 2 horizontal wings

Question 52

What are the methods of achieving variable thrust? (8)

Answer 52

``` Gimballed machine Flexible nozzle Jetavator Jet vanes Liquid injection Auxiliary jets Direct force control ```

Question 53

What are the three factors affecting the | choice of a warhead?

Answer 53

* Role * Target * Accuracy of the missile

Question 54

What are the 3 categories of warheads used in | GW?

Answer 54

- HE - Special - Non operational

Question 55

List 5 types of HE warhead that are employed in | GW systems?

Answer 55

- HESH - frag - shaped charge - sub projectile - blast

Question 56

What are the 3 types of Special Warheads?

Answer 56

- chemical - biological - nuclear

Question 57

What is meant by the term “Propagation”? XX

Answer 57

Manner in which the effect of a warhead is transmitted eg blast, fragments etc

Question 58

The Safety & Arming Mechanism has three functions what are they ? XX

Answer 58

- Prevent accidental initiation of warhead - Arm the warhead after firing when missile is a safe distance from operator - Translate the fuze firing signal into a detonation wave

Question 59

Examples of Electrical Aux. power? (5)

Answer 59

- generators / alternators - accumulators - thermal batteries - mercury cells - dry batteries

Question 60

The payload and fuzing system of GW are usually referred to as the armament system, what are its basic components?

Answer 60

* Payload * Fuze * Safety and Arming Mechanism

Question 61

What are the non-operational heads for use on GW?

Answer 61

* Drill * Practice * Telemetry

Question 62

What are the three types of fuzes for use on GW?

Answer 62

- Impact - Time - Proximity

Question 63

What is attenuation?

Answer 63

Reduction in effect of the warhead as distance from detonation increases

Question 64

What are 2 types of controlled guidance? Expand with 2 subtypes for the first

Answer 64

Command - Command (to) Line of Sight - CLOS - Command Off the Line Of Sight - COLOS

Question 65

4 assemblies to a bi-propellant engine?

Answer 65

- Storage tanks - engine - feed system - fuel control system

Question 66

Advantages to solid propellants (6)

Answer 66

- immediate response when firing - storage container for propellant - Ease of storage and handling - simple design - Can be a stress bearing member - Non Toxic

Question 67

Advantage of turbojet?

Answer 67

NO BOOST required to get engine to operating speeds

Question 68

What does SACLOS stand for?

Answer 68

Semi automatic Command to Line of Sight