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AT Course_NE > Test 12 - Anti-Tank / RCL > Flashcards

Test 12 - Anti-Tank / RCL Flashcards

1
Q

Explain the 84mm Illum 545 from firing to function?

A

When the firing mech of the weapon is operated, the firing pin strikes the primer resulting in the priming composition being crushed against the anvil and causing it to ignite.
The flame produced flashes through to the ignition composition causing it to ignite.
This increases the flame size and temperature sufficiently to ignite the main propellant charge.
The burning propellant produces a large quantity of hot gas that acts on the base of the proj.
The pressure builds until it is sufficient to overcome the cc to proj crimp.
At this point the projectile is driven forward down the barrel of the weapon causing the driving band to become engaged in the rifling of the barrel and imparting spin to the proj.
Once the proj leaves the barrel, the spin will provide stability during flight.
At the same time that the projectile starts to move forward, the pressure of the propellant gases acting on the base plate of the cc causes the plate to be expelled.
This allows a controlled bleed of gas rearwards to act against the forces moving forward and thereby reducing the recoil on the user of the weapon.
On firing, setback forces are generated by the rapid acceleration of the proj forward.
This force pushes the hammer, containing the detonator, against a spring and into the firing pin, causing it to function.
The flame generated passes through the flash channel in the arming and firing mech to the igniter composition creating ignition.
The burning igniter composition then starts the delay composition burning.
At the completion of the delay the flame initiates the booster pellets.
The flame from the burning pellets passes down a flash channel and initiates the expelling charge in the base of the fuze.
The expelling charge produces a large volume of gas that forces against the illuminating canister.
This force is transmitted through the canister to the parachute and then to the proj base.
Once sufficient pressure is reached, the pins retaining the proj base in position are sheared and the canister, parachute and proj base are expelled from the body of the proj.
During this process the hot gas also burns through the thin metal of the canister and ignites the illuminating composition below.
The parachute then ejects and plumes from the body as the half casings are stripped away by wind force.
The retarding effect of the parachute slows the decent of the burning illuminate to approx 5 m/s
The composition continues to burn for approximately 30 seconds.

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2
Q

What is the velocity, ranges and tracer burn time of the Cart 20mm/502 Trac w/cap PERC?

A
  • 220m/s
  • 300m-1750m
  • 1.6 sec
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3
Q

What are the principle components of the CART 20mm/502 Trac w/cap PERC?

A 
T - Tracer
I - Ignition
I - Igniter Composition Hole
P - Projectile
P - Plastic Driving Band
P - Propellant Charge
S - Spacer
C - Cartridge Case
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4
Q

Statement about RKT 66mm M&2A6 Warhead (Topic 10, para 9)?

A

The warhead is fitted with a PIBD fuze. The fuze is designed to operate in BOTH DIRECT IMPACT mode, using a piezo-electric crystal in the nose cap, with a BACKUP GRAZE mode (with separate, inertially operated, impact detonator, fired by a cocked striker). The graze element allows for detonation at oblique strikes of up to 30 degrees, against hard targets.

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5
Q

Which round is the Cart 84mm TP FFV 552 ballistically matched to?

A

Cart 84mm HEAT FFV 551

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6
Q

What are the cook off guidelines for FFV 551

A
  1. max weapon temp of 115 deg C
  2. max of ten rounds fired in close succession
  3. max of twenty-five rounds can be fired at a rate of fire of six rounds per minute.
  4. Rate of fire for prolonged firings is to be ‘considerably less than’ five rounds per minute.
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7
Q

What is the explosive composition in the FFV 551?

A
  1. warhead octol (hmx/tnt 70/30) 460g

2. booster tetryl 7.39g

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8
Q

what is the FFV551 min and max effective range

A

150 min

700 max

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9
Q

What are the firing limitations/exposure per day for HEAT 551?

A

Standing - 7
Kneeling - 1
Prone - 0 in peacetime

safety sup etc included

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10
Q

What is the candela, burn time and illumination diameter for the 545

A

650,000 candlepower
30secs +/- 5 sec burn time
400 - 500m diameter illuminated

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11
Q

what is on top of the old 545 fuze and it’s purpose?

A
  • A rubber cap you remove it before setting the fuze with the safety pin.
  • Prevent failure of the fuze due to water ingress during storage and transport
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12
Q

What is the HE filling in the M72A6?

A

Octol (HMX/TNT 70/30) 315g

booster Comp A5 - 5.6g

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13
Q

What is the propellant and weight in the 66RKT Motor?

A
  • M7 tubular grain

- 122g

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14
Q

What is the armour penetration of the HEAT 551?

A

Approximately 400mm

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15
Q

What is the minimum angle of impact required to function the HEAT 551 electric fuze?

A

10 degrees

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16
Q

What is the arming distance of the HEAT 551?

A

5-8m

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17
Q

What is the overall purpose of the 551 projectile nose cone? (2)

A
  • Provide the critical stand-off to achieve optimum penetration from the shape charge
  • Act as the shock transmitter to the piezo-electric crystal generator at the base of the nose.
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18
Q

What is the main body of the projectile of the HEAT 551 made of?

A

Aluminium alloy

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19
Q

What booster is contained within the HEAT 551 projectile?

A

3 tetryl pellets, increasing in size towards the main fill (7.39 grams)

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20
Q

What is the unique safety feature of the HEAT 551 after it has been armed and what causes it to occur?

A

The electrical system can be short circuited if it detects abnormal pressure in the rocket system during flight.

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21
Q

What is the first safety mechanism in the fuze of the HEAT 551?

A

Mechanical rotor containing the booster and the electrical circuit held 270 degrees out of line with the detonator by 2 safety sleeves that are operated by setback forces.

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22
Q

How is the electrical energy required to function the electric detonator produced for the HEAT 551?

A

5 piezo-electric crystals that convert mechanical shock to electrical energy

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23
Q

What does the stabilising unit consist of in the HEAT 551?

A

6 folding fins which are forced out on firing by a plunger operated by the propellant gases.

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24
Q

What is the propellant used in the rocket motor of the HEAT 551?

A

Double Base – AKB 250M 270 grams

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25
Q

What is the propellant contained within the cartridge case assembly of the HEAT 551?

A

Double Base – AKB 204

370 grams

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26
Q

What is the purpose of the 84mm Illumination 545?

A

Rapid battlefield illumination

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27
Q

What are the minimum and maximum ranges of the 545?

A
  • Min – 300 m

* Max – 2100 m

28
Q

What type is the fuze of the 545?

A

Combustible time fuze (Fuze CT)

29
Q

What is the blow-out disc made of and what is it purpose for 84mm?

A

Laminated paper impregnated with phenolic resin, rupturing during firing to reduce recoil

30
Q

What is the desired height of burst for the 545?

A

200m

31
Q

What is the propellant in the cartridge case of 545?

A

Double base AKB 204 355g

32
Q

What is the illuminating composition in the 545?

A

Magnesium / Sodium Nitrate 570g

33
Q

What is the time train composition in the 545 fuze?

A

Black powder M/90 - 7g

34
Q

What is the M72A6 designed to be used against?

A

Light Armoured Vehicles and Field Fortifications

35
Q

When does the M72A6 fuze arm after firing?

A

Approximately 12 m, based on time from setback (0.67 sec for escapement to wind down)

36
Q

What are the ranges that the M72A6 be fired?

A
  • Minimum – Training – 100m / Operationally – 25m
  • Max effective – 220m, stationary targets at 350m
  • Max range – 1400m
37
Q

What is the penetration capability of the M72A6 warhead?

A

150mm of armour

38
Q

What is the fuze type and operating modes for the M72A6?

A

Fuze M412A1, PIBD, with impact and backup graze settings.

39
Q

What are the 3 components of the M72A6 Warhead (Tactical Rocket Assembly)?

A
  • Fin Group Rocket Motor
  • M412A1 Fuze
  • M72A6 Warhead Assembly
40
Q

Up to what angle does the graze element operate in the M412A1?

A

30 degrees against hard targets

41
Q

Why can’t the M72A6 be fired indoors?

A

The Back Blast Danger Area (BBDA) of 70 m

42
Q

What is the M72A6 igniter assembly made of?

A

The primer and flash tube of black powder impregnated cotton

43
Q

What round is the 21mm Sub-Cal ballstically matched to?

A

RKT 66mm M72A6 HEAT

44
Q

What is the propellant used in the 21mm Sub-Cal?

A

6 tubular sticks of M7 propellant (18 grams)

45
Q

What is the composition of the tracer element in the 21mm subcal?

A

0.55 gram black powder with RS37 and RS 57/37

46
Q

How long does the 21mm subcal tracer burn for?

A

250m

47
Q

What does the greased silicon ring on the head of the 21mm Sub-Cal achieve?

A

Forward obturation

48
Q

What are the components of the 21mm subcal igniter assembly? (3)

A
  • Primer Percussion DM 1204 (0.324 grams Sinoxid)
  • Flash tube housing (Black powder 0.2 grams)
  • Igniter Charge (Black powder 1.9 grams)
49
Q

What is the arming distance of the ASM 509?

A

12-25m

50
Q

What is the main fill of the ASM 509?

A

PAX-47 enhanced blast explosive (HMX 40% / Al Powder 40% / Binder & Plasticizer)

51
Q

What are the two requirements of the Safety and Arming mechanism of the ASM 509?

A

Acceleration and gas pressure

52
Q

What is the safe arm distance of the 469B?

A

20-70m

53
Q

What is the delay and then the rocket motor burn time for the Cart 84mm HEAT FFV 551?

A

0.5 sec delay, 1.5 second burn time

54
Q

What is the fuze fitted to the HE 441B?

A

STIDAR 447, MTSQ with graze function

55
Q

What is the arming distance for the Fuze STIDAR 447 (HE441B Fuze)?

A

20-70m

56
Q

What is the minimum angle of impact for the fuze STIDAR 447 to function?

A

5 degrees

57
Q

What is the armour penetration depth of the HEDP 502?

A

Greater than 100mm

58
Q

What is the maximum and minimum angle of impact of HEDP 502?

A

Min 15 degrees, Max 75 degrees

59
Q

What are the two independent preconditions for the 502 SAI unit?

A

Gas pressure, acceleration

60
Q

What does the mode selector do for the 502 SAI unit in each of the following positions?

  • Storage and handling/Delay
  • Impact
A

Storage and handling/Delay – short circuit the electric system
Impact – Cancel the short circuit

61
Q

Why is the 502 fin stabilised and not spin?

A

So the spin doesn’t degrade the formation of the jet from the shape charge

62
Q

What is the 20mm Sub-Cal Ammunition Adaptor used with?

A

Cart 20mm/502 Trac w/cap PERC

63
Q

What is is the 20mm subcal 502 round used to simulate?

A

Cart 84mm HEAT 551

64
Q

How long does the trace burn and what is its colour for the 84mm ATK Prac TPT 141?

A

400m, red

65
Q

What is the payload of steel balls in the HE 441B?

A

800 approx

66
Q

How many safety devices are contained within the STIDAR 447 fuze and what are they?

A 
6:
M - Mask Safety
I - In flight safety
L - Locking system safety
D - Detonator Safety
H - Handling safety
B - Bore safety
67
Q

Label the Fuze Diagrams (2)

A 
545 Fuze:
- Igniter composition
- Safety Pin
- Hammer
- Spring
- Channel
- Time train
- Flash hole
- Fuze body
- Firing pin
- Expelling charge
- Pellet
- Pellet
- Broadcloth washer
- Time-train ring
551 Fuze Safe:
- Safety Spring Plate
- Safety Sleeve A
- Stop screw in the sleeve
- Rotor
- Electric detonator
- Arming Spring
- Safety sleeve B
551 Fuze Armed:
- Safety Sleeve B
- Rotor
- Safety sleeve A
- Electric Detonator
- Contact piece
- Contact Spring

AT Course_NE (23 decks)

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