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AmmoTech > DS - Armour > Flashcards

DS - Armour Flashcards

1
Q

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

A

5.3 secs in flight

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2
Q

Explain how the projectile of the 25mm Mk2 functions after 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.

The heat and pressure generated within the projectile then cause the HE to detonate and fragment the steel body.

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3
Q

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

A

10g of Comp A4

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4
Q

What are the components that make up the 25mm M791?

xx

A 
Cart case
Primer percussion M115
Ignition booster pellet
Propellant WC886
Tracer
Base
Sabot
Penetrator
Windshield
Nose cap
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5
Q

The 25mm cartridge case consists of:

A
  • Rimless
  • Drawn carbon steel
  • Painted olive drab / dark green
  • Projectile secured by either eight bit or single 360 degree indenting
  • A link-locating groove is located below the shoulder
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6
Q

What is the name and details for the 25mm Cart Case primer? (1+2)

Name and weight of booster pellet?

A
  • M115 Primer
  • Press fit percussion type
  • Punch stabbed or ring indented into position
  • A 10g IB52 booster pellet augments the primer
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7
Q

What are the Names for the 25mm Ammunition?

M791
M792
M793
M794
M910
Mk2
A

Cart 25mm…

...APDS-T M791
...HEI-T M792
...TP-T (ADI) M793
...Dummy M794
...TPDS-T M910
...MPSD-T Mk2
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8
Q 
Names of the Cart 120mm Ammunition?
M830A1
A2
M1028
M865
M831A1
M1002
A 
Cart 120mm HEAT-MP-T M830A1
KE-W A2 120mm APFSDS-T 
Cart 120mm Canister Anti-Pers M1028
Cart 120mm TPCSDS-T M865
Cart 120mm TP-T M831A1
Cart 120mm TPMP-T M1002
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9
Q

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

Name the fuze

A

Air - Prox
Ground - PD

M774 PD

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10
Q

Name the assemblies that make up the propulsion system in ALL 120mm natures.

A 
Case base and seal assembly
Spring disc
Retaining ring
CCC
Elec primer (M129 Live/M125 Prac)
Combustible disc
Propellant JA-2 (Live) M14 (Prac)
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11
Q

What is the quantity, weight and diameter of balls in the Canister round?

A

1100 x Tungsten balls
Weight 8.3g
9.5mm

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12
Q

What is the V notch for on the Canister round?

A

Separation of the sidewall after barrel exit

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13
Q

Why is the 120mm Canister frangible?

A

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

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14
Q

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

A

Six equally spaced slots

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15
Q

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

A

Impart spin and cause it to lose ballistic stability

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16
Q

At what distance does the TPCSDS-T lose stability?

A

Within 8000m

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17
Q

What is the fuze used in Cart 25mm HEI-T M792; what type and fill?

A

PD M774 HMX/PBXN-5

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18
Q

What Targets are the Cart 120mm M830A1

HEAT MP T designed to defeat ?

A 
Light Armoured Vehicles

Helicopters

Soft Targets (Bunkers)
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19
Q

Prior to loading, what can the Fuze PIBD

M774 be set to ?

A

Ground (G) point detonating

Air (A) proximity mode

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20
Q

What happens on Firing of the Cart 120mm
M830A1 HEAT MP T Round ?

xx

A
  • Fuze set prior to loading
  • Voltage applied to electric primer (M129)
  • Ignites propellant (JA 2), 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
    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 the armed position aligning the
    explosive train
    Target sensed by M74, firing signal is sent to
    M774 fuze.

    M774 firing capacitor provides energy to initiate
    M69 detonator.

    M69 detonator initiates fuze lead cup, initiates
    booster cup, initiates warhead

    Copper jet formed along with shrapnel and blast.
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21
Q

Describe the operation of the 120mm APFSD-T KE W A2

from firing to tar?

A

Fired electrically thru the M256 Firing System

- Voltage applied to the M129 Primer
- Initiates primers ignition charge to a small gunpowder charge which in turn initiates the primer’s Benite Strands.
- These benite strands are evenly distributed within the primer tube and is designed to give maximum initiation of the main propellant charge JA 2
- JA 2 burns which consumes the CCC and ignites the tracer element
- Expanding gases accelerates the projectile into and thru the barrel
- The steel case base and seal assembly (CBSA) and the primer tube are left behind
- Obturation is provided by the Nylon obturator and seal on the projectile
- Projectile exits Barrel allowing the Sabot/Obturator to peel off and discard
- Leaving the penetrator to travel to the target

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22
Q

Describe the role of the 120mm Canister

round?

A 
The 120mm Canister round is an Antipersonnel
round.
 Offensive fire against exposed enemy
 Defensive fire against massed infantry
assaults
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23
Q

..

24
Q

The Cart 120mm M831A1 TP T is used to

Simulate which round ?

A

Obsolete M830 HEAT MP T

25
Q

Cart 120mm M1002 Target Practice Tracer (TPMP T)

What is the Aluminium Stabiliser Designed to
do ?

A

Impart spin to the projectile

26
Q

Logistic name for ARAT?

A

XM19 Abrams Reactive Armour Tiles

27
Q

Explain the Operation for the XM19 ARAT?

28
Q

What 25mm use the following propellant:

WC890 Double Base (3)

A

MPT-SD Mk2
HEI-T M792
TP-T M793

29
Q

What propellant is used by the following:

M793

A

AR2220 Single Base

30
Q

What propellant is used by the following:

M791

A

WC886 Double Base

31
Q

Explain Functioning of Mk2 from impact

A

The MPSD-T Mk 2 projectile functions after impact and penetration of the target.

  • On striking the target the aluminum 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.
  • The heat and pressure generated within the projectile then cause the HE to detonate and fragment the steel body.
  • An inherent delay of approximately 0.3ms allows the strengthened projectile body to penetrate the skin of the target before detonating.
  • The effect of the projectile, when functioning inside the target, is a combination of incendiary, fragmentation and blast effects.
  • Should the projectile miss its target, the tracer, after the required burn-time, will heat the thin wall between the tracer and self destruct device causing the HE charge to detonate and the projectile to self-destruct.
32
Q

Explain Functioning of 25mm Mk2 from impact onwards

A

The MPSDT Mk 2 projectile functions after impact and penetration of the target.
On striking the target the aluminum 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. The heat and pressure generated within the projectile then cause the HE to detonate and fragment the steel body. An inherent delay of approximately 0.3ms allows the strengthened projectile body to penetrate the skin of the target before detonating. The effect of the projectile, when
functioning inside the target, is a combination of incendiary, fragmentation and blast effects. Should the projectile miss its target, the tracer, after the required burn-time, will heat the thin wall between the tracer and self destruct device causing the HE charge to detonate and the projectile to self-destruct.

33
Q

Explain how the APDS-T M791 functions from
firing.

xx

A

On firing, firing pin initiates the primer which ignites the propellant.
- Gases from burning propellant propel the projectile from the weapon and ignite the tracer.
- Setback, centrifugal and air pressure forces cause the sabot to discard upon leaving the weapon muzzle. - The penetrator is spin stabilised and penetrates target
by kinetic energy.

34
Q

Name the components common to all four (live) natures of 25mm ammunition employed with the M242 weapon system.

A 
Cart case,

Primer M115,

M28 Link, 

Tracer Igniter. (Magnesium-based)
35
Q

What colour are the markings of the MPSD-T

Mk 2?

A

The projectile is coloured yellow, has a red band with lot details in red.
The nose cap is anodised aluminium.

36
Q 
Names of the Cart 120mm Ammunition?
M830A1
A2
M1028
M865
M831A1
M1002
A 
Cart 120mm HEAT-MP-T M830A1
KE-W A2 120mm APFSDS-T 
Cart 120mm Canister Anti-Pers M1028
Cart 120mm TPCSDS-T M865
Cart 120mm TP-T M831A1
Cart 120mm TPMP-T M1002
37
Q

Common Components of the 120mm Cart Case?

xx

A

CCC - Sealed and painted, NC, woodpulp, polyurethane
ELECTRIC Primer
- M129 (Live) / M125 (Prac)
PROPELLANT
- JA-2 Double Base (Live) / M14 Single base
CASE Base and Seal Assembly
- Steel base with silicon rubber seal assembly
COMBUSTIBLE Disc
PROPELLANT Containment Bag

38
Q

What is the safe arming distance for the

Cart 25mm HEI-T M792?

39
Q

Not all Cart 25mm HEI-T M792 rounds are sourced the same. What are the differences

A
  • Type of propellant

- Projectile length

40
Q

The Cart 25mm TP-T M793 is ballistically matched to what other projectile?

A

Cart 25mm MPSD-T Mk2

41
Q

Describe Materials and and type of link for

M28 Link?

A
  • Phosphated metal

- Disintegrating type

42
Q

25mm APDS-T M791

  • Penetrator Material?
  • Range?
  • Muzzle Velocity?
  • Minimum burn time of the tracer?
  • Propellant?
A
  • Tungsten alloy
  • 2000m
  • 1345m/s
  • 1.4 sec
  • WC886
43
Q

25mm TPDS-T M910

  • Used for?
  • matched with?
  • Where used?
  • What is penetrator made of:
A
  • Training round for M791
  • Ballistically matched to M791
  • Used on ranges with limited safety trace
  • Solid steel pen. with NYLON sabot
44
Q

25mm MPSD-T Mk2

  • What is the time of delay element?
  • Projectile is made of?
  • Main charge name, qty?
A
  • 0.3 milli seconds
  • Boron steel
  • RS40 Incendiary mixture 2.7g
    10g of Comp A4
45
Q

25mm HEI-T M792
Likely targets?
Name body and material
Name fuze

A
  • unarmoured and lightly armoured vehicles to 3000m
  • C1045 steel
    M758 Mechanical PD Fuze
46
Q

25mm HEI-T M792

What type of fill?
Weight of fill?
What can vary on the round and why?

A
  • H761 HEI mix
  • 32g
  • Propellant type, Projectile length
  • Different manufacturer
47
Q

25mm TP-T M793

Used for? (3)

A

Training
Gun testing
Handling drills M242 Cannon

48
Q

25mm Dummy M794
Filled with and why?
- Used for?

A
  • Epoxy resin
    to approximate M793
  • Gunnery drills
    Weapon inspection
    Test purposes
49
Q

XM19 ARAT
Explosive fill - name and main HE?
How many tiles on each side?

A
  • LF-2XA
  • RDX
  • 21
50
Q

120mm M830A1 HEAT MP-T

  • What type of fuze
  • Main fill?
A
  • M774 PIBD Fuze
    -PD, Prox
    Comp A3
51
Q

120mm APFSDS-T KE-W A2

Primer:

52
Q

120mm Canister Anti-Pers M1028

53
Q

120mm TPCSDS-T M865

54
Q

120mm M831A1 TP-T

Matched with?

A
  • M830 HEAT MP-T (obsolete)
55
Q

120mm TPMP-T M1002

A

M830A1 HEAT MP-T

56
Q

What rounds use JA-2 Propellant

A

M830A1
KE-W A2
Canister

AmmoTech (41 decks)

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