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AmmoTech > DS - Mortar > Flashcards

DS - Mortar Flashcards

1
Q

What is the primary ignition cart used on 60mm mortars?

A

M702 Ignition Cart

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2
Q

What is the candle power for 60mm Illum M721?

A

Max 400 000 for 40secs

Min 250 000 for 32secs

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3
Q

What is the candle power for 60mm IR Illum M767?

A

500 an near IR wavelength of the electromagnetic part of the spectrum (between 60 to 90um)

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4
Q

How does the Fuze PD M775 work?

A
  1. Safety pin is removed.
  2. On acceleration, the setback pin moves rearward against a spring, releasing a slider, which holds the striker in its rearward position.
  3. Once the striker is released, it travels upward allowing the ball bearings to be forced into centrifugal alignment between the striker and the primer.
  4. On impact, the striker is driven into the ball bearings, which initiate the primer, igniting the pyrotechnic smoke cartridge. It produces a flash, audible sound and smoke to simulate HE
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5
Q

How does fuse MTSQ M776 work?

xx

A

The time is set using the fuse setter. The safety pin is removed before firing. When the round is fired and an acceleration of 500g is reached, the setback sleeve withdrawals, allowing setback pins to retract, unlatching the pallet of the escapement. The setback pins lower collars disengage, setting the spring-loaded detonator housing free to turn after the detonator housing locking shaft extension has turned out of the slot in the detonator housing. The barrel continues to turn until the gap in its crown aligns with the tongue of the firing lever. The striker bushing spring forces the bushing downwards and forces the firing lever and the release lever apart, disengaging the claws, striking the firing pin head and thrusting it into the detonator, this initiating the firing train at the pre set time.

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6
Q

What is the arming distance for the M783 MO fuse?

A

100m

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7
Q

What are the four settings for the M734A1?

A

Prox - 14ft
NSB - 7ft
Impact
Delay - 50-150ms

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8
Q

Label the 60mm IR Illum mortar.

A 
Ignition cart M702
Fin M27
Propelling charge M204/M235
Base plate
Illuminant
First fire composition
Time fuse M776
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9
Q

What is the augmenting charge used for the M0221A1?

A

AR2205 Single base x 6

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10
Q

What is the minimum safety arming distance for MTSQ M772?

A

40m

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11
Q

How does the 81mm Illum work?

A

Obturator ring expands under gas pressure from burning propellant causing forward obturation. The gases propel the mortar bomb. The setback force during firing unlocks the fuses setback safety device, commencing the arming sequence. When it reaches pre selected flight time, the fuse functions and initiates the booster. The internal pressure build up causes separation of the front and tail cone sections by fracturing the shear pins. The illuminating assembly is ejected rearwards from the front section of the mortar body. Simultaneously, the fuse booster initiates the ignition system of the illuminant canister. Deployment of the parachute controls the rate of descent.

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12
Q

How many wedges and what weight are in the 81mm Smk RP?

A

28 wedges

  • 43g
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13
Q

What is in the 81mm Smk RP?

A

M752A1 Ignition Cart
M218 Propelling Charge
M819 Loading Assembly

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14
Q

What is the GAM for and what is its life expectancy?

Where are the Gas Absorbent Modules (GAMs) fitted?
xx

A
  • The GAM is used to encapsulate phosphine gases (Red Phos by-products) .
  • 7-10 year life expectancy
  • one is located in the base of the fibreboard cylinder and the other is fitted to the tail-cone of the mortar cartridge forward of the M218 Propelling Charge Assemblies
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15
Q

What powers the MO M734?

What is the minimum arming distance

A

a turbine alternator

Minimum arming distance 100m

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16
Q

81mm IR M816 w MTSQ M772 Actions from Time Set

A

On achieving the pre-selected flight time, the fuze functions resulting in the initiation of the fuze booster. The internal pressure build up as a result of the function of the fuze booster causes separation of the front and tail cone sections of the mortar body by fracturing the shear pins.
On separation of the mortar body, the M816 IR Illuminating Assembly is ejected rearwards from the front section of the mortar body. Simultaneously, the function of the fuze booster initiates the ignition system of the IR illuminant canister.
Deployment of the parachute assembly controls the rate of descent of the IR illuminant canister.
The IR illuminant canister generates a minimum IR luminosity of 50 watts/steradian for a minimum period of 60 seconds.

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17
Q

Describe the parts of the Cart 81mm Illuminating M9769A2 Fzd MTSQ DM93?

A 
Fuze, MTSQ DM93
Expulsion Charge
Delay Element
Illuminant ...
Body, front
Shear Pin
Drogue Parachute
Obturating Ring
Body, rear
Main parachute
Augmenting Charge
Tailfin Assembly
Primary Carttridge
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18
Q

What is the selectable time range for the FZ MTSQ M776?

A

between 6 and 54 seconds in graduations of one second

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19
Q

What is the difference between DM93 MT

and DM93 MTSQ

A
  • The DM93 MT has the SQ element removed

- There is a Deformation zone at the front of the steel nose cone.

20
Q

What is the fuze fitted to which round
currently in service?
Cart 81 mm ILLUM M9769A2 xx??????

A

Fuze MTSQ DM93

21
Q

What is the difference between DM93 MT and DM93 MTSQ

A
  • The DM93 MT has the SQ element removed

- There is a Deformation zone at the front of the steel nose cone.

22
Q

What are the 2 modes of function of the

Fuze MTSQ M772?

A

Mechanical Time and Superquick (PD)

23
Q

What is the luminosity and burn time of the illuminant composition of the following 2 Illum bombs:

  1. CART 81MM Mortar IR ILLUM M816 Fzd MTSQ M772?
  2. Cartridge 81mm Illuminating M853A1 Fzd MTSQ M772
A
  1. IR Luminosity: 50 watts/steradian
    Minimum of 60 secs
  2. Luminosity: 525,000 Candela
    Minimum of 50 secs
24
Q

What is the minimum arming distance and time?

CART 81MM MORTAR IR ILLUM M816 FZD MTSQ M772

A
  • delay of approx 1.0 seconds

- not less than 40 METRES

25
Q

What fuze is associated with the
CARTRIDGE, 81MM. MORTAR, TARGET
PRACTICE (TP), M879 ?

26
Q

What are the modes of function of the fuze M751:

27
Q

What are the 4 fuze setting modes on the Fuze M751?

How does the Proximity fuze setting work?

A
  • Proximity
  • Near Surface Burst
  • Impact
  • Delay
28
Q

Explain function from Firing of the 81mm RP?

A

On achieving the pre selected flight time, the fuze
functions.

Function of the fuze charge initiates the supplemental charge,

which ignites the RP wedges and causes separation of the front and tail cone sections of the mortar body deploying the burning RP wedges.

The burning RP wedges generate a cloud of
dense smoke

29
Q

What is the MO Fuze M734/M734A1 fitted to?

4 modes ?

3 safety arrangements?

A

-Cart 60mm HE 720A1

  • Proximity
    Near Surface Burst
    Super Quick (Impact)
    Delay
30
Q

What are the major components of the

CART 81mm MOR HE M0221A1?

A 
Fuze PD M935
Body Assembly
Main Explosive Filling (TNT)
Obturating Ring
Tailfin Assembly
Augmenting Charges
Primary Cartridge
31
Q

How many augmenting charges comprise the assembly on the CART 81mm MOR HE M0221A1/M0231A1?

32
Q

What is the explosive fill of the CART 81mm MOR HE M0221A1?

A

800g of TNT

33
Q

CART 60MM Mor ILLUM (VL) M721 Fzd MTSQ M776

Describe functioning from Time Set

A

On achieving the pre-selected flight time, the fuze functions resulting in the initiation of the fuze booster. The internal pressure build up as a result of the function of the fuze booster causes separation of the front and tail cone sections of the mortar body by fracturing the shear pins.
On separation of the mortar body, the M816 IR Illuminating Assembly is ejected rearwards from the front section of the mortar body. Simultaneously, the function of the fuze booster initiates the ignition system of the IR illuminant canister.
Deployment of the parachute assembly controls the rate of descent of the IR illuminant canister.
The IR illuminant canister generates a minimum IR luminosity of 50 watts/steradian for a minimum period of 60 seconds.

34
Q

How many charge bags with the M889A1

35
Q

What is the main fill type of M0221A1?

no DEOP

36
Q

What is the main fill type of M0221A1?

no DEOP

37
Q

How many charge bags with the M0221A1?

38
Q

Label components for :
CART 60mm IR ILLUM M767 Fzd M776

(3 inner, 7 outer)

A

First Fire Composition
Illuminant
Base plate

Fuze MTSQ M776
Identification Strip
Orange Band
Obturating Ring
4-Charge, Propelling M204/M235
FIN, M27
Cartridge, ignition, M702
39
Q

How many Red Phos pellets in the

Cart 81mm Mortar SMK RP M819 w/Fz M772?

A

Quantity 28 x red phosphorous (RP) wedges

consisting of 43g of Pyrotechnic Comp SW-533.

40
Q

Label?

Cart 81mm Mortar SMK RP M819 w/Fz M772 (9)

xx

A
  • Fuze MTSQ M772
  • Safety Pin
  • Supplementary Charge Assembly
  • M819 Loading Assembly
  • Shear Pin
  • Obturator Ring
  • Tailcone Assembly
  • M218 Propelling Charge Assembly
  • M7521A1 Ignition Cartridge
41
Q 
List the Different Settings for Fuzes:
M935
M783
M772
M776
M775
M751
M734
M734A1
A

Settings:
PD M935 - PD, Delay
PD M783 - PD, Delay (dummy prox and NSB)
MTSQ M772 - MT, SQ
MTSQ M776 - MT, SQ
PD M775 - PD (dummy multi-option)
PD M751 - Impact; incorporates a spotting charge
(dummy sets)
MO M734 - Prox, NSB, Imp Delay
MO M734A1 - 60/81 Prox, 120 Prox, Imp, Delay

42
Q

When would you NOT USE the M821 Inert Round?

A

When it is degraded or turning yellow in colour

43
Q 
List the Different Rounds used for Fuzes:
MO M734
MO M734A1
PD M783
PD M935
MTSQ M772
PD M751 
MTSQ M776
PD M775
A 
MO M734      81mm HE M821A1,
MO M734A1  81mm HE M821A2,
PD M783       81mm HE M889A2,
                       60mm HE M768,
PD M935       81mm HE M889A1, 
                       81mm HE M0221A1,
                       60mm HE M888,
MTSQ M772  81mm Illum M853, 
                       81mm IR Illum M816,
PD M751        81mm Tgt Prac (TP) M879,
MTSQ M776  60mm Illum (IR or VL),
PD M775        60mm Prac M769 (dummy multi-option)
44
Q 
Tab Data for HE M800 (889 and 821) Series 81mm, Names:
NEQ
Propelling Charge Assembly
Ignition Cartridge
Propellant
Main Fill
Max Range
A

NEQ 1062kg / 1066kg (M889A1)
Propelling Charge Assembly M220
Ignition Cartridge M299
Propellant M9

Main Fill
- M821A1/2: 916g Comp A5
- M889A1: 921g Comp B
A2: 916g Comp B

Range: 63m - 5636m
Mzl Vel. Charge 4: 304 m/sec

45
Q

What is the Fuze PD M783 used for?

A

Intended for tactical training use.

Can be used on operations

AmmoTech (41 decks)

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