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AT Course_NE > Test 11 - Tank/Armour > Flashcards

Test 11 - Tank/Armour Flashcards

1
Q

At what time in flight will the self destruct element initiate on the Cart 25mm MPSD-T Mk2?

A

5.3 secs in flight

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2
Q

*** Explain how the projectile of the Cart 25mm MPSD-T Mk2 functions on impact and penetration of the target.

A
  • On striking the target the aluminium nose cap of the projectile is crushed.
  • Provided the velocity of impact and resistance of the target are sufficiently high, the energy generated by the rate of deformation of the cap will be sufficient to raise the incendiary composition to its ignition temperature. (500degC)
  • The heat and pressure generated within the projectile then cause the HE to detonate and fragment the steel body.
  • An inherent delay of approx. 0.3ms allows the strengthened projectile body to penetrate the skin of the target before detonating.
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3
Q

What is the weight and type of HE fill in the 25mm MPSD-T Mk2?

A

10g of A4

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4
Q

*** What are the components that make up the APDS-T M791? (10) Fill out Diagram

A
  • Primer percussion M115
  • BIP Pellet, Ignition booster
  • Cart case
  • Propellant WC886
  • Tracer
  • Base
  • Sabot
  • Penetrator
  • Windshield
  • Nose cap
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5
Q

What are the two modes on the fuze fitted to M830A1?

A

A - Air - Prox

G - Ground - PD/Impact

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6
Q

*** Name the assemblies that make up the propulsion system in all 120mm natures. (8)

A 
R - Retaining ring
P - Propellant containment bag
G - Granulated Main charge Propellant (M14/JA-2)
C - Combustible disc
C - Case base and seal assembly (CBSA)
C - CCC
E - Elec primer (M129/M125)
S - Spring disc
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7
Q

What is the 120mm M830A1 designed to defeat?(3)

A
  • Light armoured vehicles
  • Helicopters
  • Soft targets (bunkers)
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8
Q

What is the material, qty, dia and weight of balls in the Canister round? (4)

A
  • Tungsten
  • 1100
  • 9.5mm
  • 8.3g
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9
Q

What is the V notch for on the Canister round?

A

Separation of the sidewall after barrel exit

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10
Q

What is important about the M1028 projectile cap?

A

The projectile’s aluminium cap is designed to be frangible so it does not interfere with the dispersion of the tungsten balls upon exit from the canister

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11
Q

What does the cone stabiliser on the 120mm TPCSDS-T consist of?

A

Six equally spaced slots

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12
Q

What function does the cone have in the 120mm TPCSDS-T?

A

Impart spin and cause it to lose ballistic stability

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13
Q

At what distance does the 120mm TPCSDS-T M865 lose stability?

A

Within 8000m

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14
Q

What is the Primer for the Cart 25mm CC and ignition booster pellet comp? (3)

A
  • M115 press fit percussion type
  • Punch stabbed or ring indented into position
  • 10g IB52 booster pellet augments the primer
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15
Q

What is the Propellant and weight used for the 25mm Natures?

A 
WC890 Double Based:
- MPSD-T Mk2
- HEI-T M792
- TP-T M793
AR2220 Single Based:
- TP-T (ADI)
WC886 Double Based:
- APDS-T M791
WC869/XPR-50C4 double based:
- TPDS-T M910
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16
Q

What is the Primer in the 120mm CCC?

A

MP/APDS: M129 Electric Primer

Cannister/TP: M125 Electric Primer

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17
Q

Explain the operation of a 120mm round firing?

A
  • Fuze set prior to loading (if req)
  • Voltage applied to electric primer (M129/M125)
  • Ignites propellant (JA 2/M14), tracer element and CCC
  • Gases generated propel projectile down barrel
  • Silicon seal at rear of the sabot provides obturation
  • Aerodynamic forces cause sabot and obturator to
    separate
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18
Q

*** Explain the HEAT-MP-T M830A1 and Fuze PIBD M774 from firing to impact?

A
  • On firing, a voltage is applied to the electric primer (M129), which in turn ignites the main charge propellant (JA-2), tracer element and CCC.
  • The gases generated by this combustion process propel the projectile down the gun barrel.
  • The silicon seal, at the rear of the sabot, provides obturation
  • Upon leaving gun barrel, aerodynamic forces cause sabot and obturator to separate
  • Setback allows the release mechanism in the M774 to release rotor from first safe position
  • Voltage generators activated on setback, charging the M774 firing capacitor and M74 proximity fuze capacitor
  • Deceleration on exiting the barrel allows rotor to move into armed position aligning the explosive train
  • Target sensed by M74, a firing signal is sent to the M774 fuze.
  • The M774’s firing capacitor provides the necessary energy to initiate M69 det.
  • M69 det initiates the fuze lead cup, initiates the booster cup, initiates the warhead.
  • A copper jet is formed by the detonation of the sub projectile’s warhead.
  • The copper jet, along with body shrapnel and blast, provide the capacity to defeat target.
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19
Q

What is the common propellant type for M791

A

WC886 double base

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20
Q

What is the Primer and type for 25mm?

A

M115, Percussion type

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21
Q

What is the common booster for 25mm?

A

IB-52 Booster?

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22
Q

What are the majority of 25mm CC constructed of?

A

Steel CC painted olive drab

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23
Q

What is the model number for 25mm APDS-T

A

M791

24
Q

What is the Model and material of the link for 25mm?

A

M28 Link

Phosphate Steel

25
Q

What is the max effective range of M791?

A

2000m

26
Q

What does the projectile of the M791 consist of?

A
  • Penetrator = Tungsten Alloy
  • Windshield & Base = Aluminium Alloy
  • Nose Cap = Polythylene
  • Sabot = Nylon
27
Q

What is the minimum burn time of the tracer of 25mm?

A

1.4sec

28
Q

What model number is the 25mm HEI-T?

A

M792

29
Q

What is the fuze used in the M792?

A

M758 (HMX/PBXN-5 Booster) Mech PD

30
Q

What materials are the body and the nose of the projectile of the M792 comprised from?

A
  • Nose – Plastic

- Body – Steel

31
Q

What is the main fill of the M792?

A

H761 HEI

32
Q

What is the safe arming distance for the M792?

A

10m

33
Q

Not all M792 that were provided are the same, what are the two differences that have been identified?

A
  • HC36 propellant

- Projectile Length (trace boom length)

34
Q

What is the minimum self-destruct time and cause for M792?

A
  • 6.2 sec

- caused by Spin Decay

35
Q

What are the MPSD-T Mk2 rounds designed for use against?

A

Aircraft, ships, buildings and light armoured vehicles

36
Q

What is the length of the delay element on impact of the MPSD-T Mk2?

A

0.3 ms

37
Q

What is the MPSD-T Mk 2 projectile comprised of? (3)

A
  • Body – Steel – Comp A4 (10g) and Incendiary RS 40 (9g)
  • Nose Cap – Aluminium – Incendiary RS 38 (0.3g) and RS 41 (2.5g)
  • Tracer – Magnesium
38
Q

What round is the M793 ballistically matched to when fired from a M242 Bush Master Chain Gun?

A

Cart 25mm MPSD-T Mk2

39
Q

What is the CCC Made up of? (2)

A
  • Painted and sealed NC mixed with wood pulp

- With steel cart base with a silicon rubber seal assembly

40
Q

What markings are located on the base of the 120mm CC? (6)

A
  • Country of manufacture
  • Round type
  • Round name
  • Identification markings
  • Heat treatment number
  • LOT details of base/cartridge
41
Q

What type of propellant is used in the 120mm? (2)

A

Op Rounds: JA-2 double Based

Prac Rounds: M14 Granulated single based

42
Q

What are the components of the M830A1 Proj?

A

S - 3 piece aluminium SABOT shot
S - Shaped charge (Comp A3 type II, HMX booster)
T - Trace Element
F - Fuze PIBD M774 (FISA M74 prox switch)
B - Booster PBXN-5
D - Det M69

43
Q
  • What is the Purpose of the 6 equally spaced slots in the cone of the M865?
A

Impart spin to reduce ballistic stability

44
Q
  • What is the max range of the M865?
A

8000m

45
Q
  • What is the M865 projectile comporised of? (3)
A
  • Penetrator: solid steel spike
  • Sabot: Nylon obturator, Al ring, rubber seal and Al Stabiliser
  • Tracer
46
Q

What elements make up the KE-W A2 APFSDS-T Projectile? (3)

A
  • Sabot: Three piece thermo plastic with nylon obturator
  • Penetrator: Tungsten alloy with stainless steel cast fin assembly
  • Trace Element
47
Q

What round is the M831A1 TP-T designed to simulate?

A

Cart 120mm HEAT-MP-T M830A1.

48
Q

What is the NEQ of XM19 Abrams Reactive Armour Tile?

A

3.180kg

49
Q

What is the mass of a XM19 Abrams Reactive Armour Tile?

A

29.5kg

50
Q

How many XM19 tiles are placed on the side of a M1A1?

A

31

51
Q

*** Operation of the 25mm APDS-T M791 from firing

A
  • Metal cup of the primer is distorted by action of weapons’ firing pin, compressing the primer composition between the primer cup and anvil resulting in the functioning of Primer, Percussion M115 Mod B which, in turn, initiates the Pellet, Ignition Booster.
  • The flame and hot gases, generated by the function of the primer and pellet, transmitted through the flash hole to propellant contained in cc.
  • The flame and hot gases ignite the Propellant WC886, the resulting propellant combustion produces hot expanding gases.
  • These gases ignite the tracer, generate sufficient pressure to separate the projectile from cc and accelerate projectile down the barrel.
  • The rifling of the barrel imparts centrifugal spin to the projectile.
  • On discharge from the barrel, setback & centrifugal forces and air pressure cause the sabot and base to discard.
  • The penetrator is spin stabilised and penetrates the target solely relying on the kinetic energy of the penetrator.
52
Q
  • What round is the M865 deisgned to replicate and why?
A
  • KE-W A2 120mm APFSDS-T.

- Allows for reduced safety traces compared to KE-W A2 120mm APFSDS-T.

53
Q
  • What markings does the base of the round show? (6)
A
  • country of manufacture
  • round type
  • round name
  • identification markings
  • heat treatment number
  • LOT details of case base/cartridge
54
Q
  • What is the propellant fill for the M865?
A

7.7kg M14 Granulated propellant. single based

55
Q

What are the components of the Fuse in the M830A1?

A
  • Fuze PIBD M774
  • Frontal Impact Sensor Assembly (FISA)
    • Houses M74 Prox and nose impact switches

AT Course_NE (23 decks)

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