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AT Course_NE > Test 10 - Mortars > Flashcards

Test 10 - Mortars 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 luminosity and burn time for 60mm IR Illum M767?

A

500 at near IR wavelength of the electromagnetic part of the spectrum
40 sec

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4
Q

*** How does the fuse PD M775 work?

A
  • Safety pin is removed.
  • upon acceleration from firing, the setback pin moves rearward against a spring, releasing a slider, which holds the striker in its rearward position.
  • Once the striker is released, it travels upward allowing the ball bearings to be forced into central alignment between the striker and the primer.
  • On impact, the striker is driven into the ball bearings, which initiate the primer, igniting the pyrotechnic smoke cartridge.
  • The pyro smk charge produces a flash, audible sound and smoke to simulate HE
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5
Q

How does the Fuze PD (MO) M783 work?

A

On firing, setback sensor in S and A recognises launch acceleration, releasing the 1st rotor lock (zigzag).
As the mortar travels through its flight, air is forced into the venturi, turning the turbine and generating power.
At the same time the turbine drives the gear train into the S and A to remove 2nd rotor lock (jackscrew).
The gear train provides 100m arming distance.
Once rotor unlocks it rotates 180˚ and latches, this Aligns primary and secondary explosive elements, Connects the elec det.
Once S and A is fully armed, there is an elec delay to the elec arming until post round apogee by monitoring turbine frequency.

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6
Q

What is the arming distance for the M783 PD (MO) fuse?

A

100m

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7
Q

What are the four settings for the Fuze 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
4 Propelling charge M204/M235
Base plate
Obturating Ring
Orange Band
Illuminant
First fire composition
Identification Strip
Time fuse M776
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9
Q

What is the minimum safety arming distance for MTSQ M772?

A

40m

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10
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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11
Q

How many wedges and what weight are in the 81mm Smk RP? (2)

A
  • 28 wedges

- 43g

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12
Q

What is in the 81mm Smk RP? (3)

A

M752A1 Ignition Cart
M218 Propelling Charge
M819 Loading Assembly

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13
Q

What is the GAM? what is it used for, life expectancy and must do with it? (4)

A
  • Gas Absorbent Module
  • The primary function of the GAM is to absorb the decomposition by-products of the RP (phosphine gas).
  • life expectancy between 7 to 10 years.
  • Must be removed prior to firing
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14
Q

What are the Fuze settings for Smoke/Illum and why?

A

Mech time - 4-56 secs. To function in the air for optimum spread or to illuminate a target area.
SQ - backup incase the MT doesn’t work.

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15
Q

What powers the MO M734?

A

The turbine alternator assembly is responsible for supplying both electrical and mechanical energy to the fuse.

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16
Q

When would you not use an inert replica round?

A

When it is observed to be degrading or turning yellow in colour

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17
Q

6 Different 60mm Mortars?

A
  • Cart 60mm Mor HE M768 w/Fuze PD M783
  • Cart 60mm Mor HE M888 w/Fuze PF M935
  • Cart 60mm Mor Illum (VL) M721 w/Fuze MTSQ M776
  • Cart 60mm Mor Illum (IR) M767 w/Fuze MTSQ M776
  • Cart 60mm Mor Smk WP M722A1 w/Fuze M783 PD/DLY
  • Cart 60mm Prac M769 w/Fuze PD M775
18
Q

What is the Propelling charges used in the 60mm?

A
  • M235 Augmenting Charges
19
Q

How many charge bags with the M0221A1?

A

6

20
Q

How many increments for the Cart 81mm mortar TP M879 Fuzed PD Prac M571?

A

4

21
Q

What fuze is associated with the cart 81mm mor TP M879?

A

Fuze PD M751

22
Q

What is the minimum Arming Dist and time for 81mm mor IR illum M816 fzd MTSQ M772?

A

The fuze has a mnimum arming delay of 1.0 sec (approx.) and will not arm at a distance less than 40m

23
Q

What is the Burn time and luminosity of the candle in the 81mm illum M9769A2 fzd MTSQ DM93 (2)

A
  • Burn time: 60sec

- Candle luminosity: 500,000 candela

24
Q

What is the Burn time and luminosity of the candle in the 81mm illum M853A1 w/fuze MTSQ M772 (2)

A
  • Burn time: 50sec

- Candle luminosity: 525,000 candela

25
Q

81mm smk RP M819 fzd MTSQ M772 will fire what? At what height? and how long will it provide a screen for? (3)

A
  • Volley of 3
  • 175mm
  • 5 minutes
26
Q

M734 Fuze actions during flight?

A

During flight, air ingested throught he ventuir is driven over the turbine and escapes through the air outlet vents located between the ogive and ogive base. Rotation of the turbine alternator shaft inthe turbine alternator assembly generates the electricical energy to power the fuzes’ electronics package

Rotation of the turbine alternator shaft also drives a mechanical gear reduction train which retracts the second rotor lock (jackscrew). A predetermined number of turns of athe gear train is required to retract the second rotor lock from the engagement in the S&A rotor. The delay in disengaging the second rotor lock results in a minimum mechanical arming dist of 100m

The fuze electronics monitor voltage and frequency and provide the fuze with an electrical function delay additional to and greater than the mechanical arming delay.

On release of the second rotor lock and driven by the influence of the rotor spring, the rotor rotates 180 degrees. Subsequent to rotating 180 degrees, the rotor is locked into the armed position. the fuze is now fully armed, the:

  • electronic detonator is connected to the fuze electronics thereby closing the firing circuit.
  • delay primer is aligned with the fixed firing pin
  • gear train is disengaged from the turbine alternator shaft
27
Q

What is the main fill type and weight of the 81mm HE M889A1?

A

Comp B

921 grams

28
Q

How many charge bags in the M889A1?

A

4

29
Q

What is the main fill type and weight of M0221A1?

A

TNT - 800g

30
Q

Describe the Function of the Fuze M935?

A

Before firing:
- The fuze setting is selected (SQ or D) and the safety pin is withdrawn
On Firing:
- The first and second detents setback releasing the two locking balls – releasing Main Striker and Delayed Arming Striker
- All arming setback requires minimum acceleration of 300G
- Delayed Arming Striker then moves rearwards initiating the pyrotechnic Delay Element, M53
During Flight
- Once setback is overcome, the Main Striker moves forward removing the point of the Main Striker from the recess in the Shutter Assembly
- The forward movement of the Main Striker engages the safety latch, which locks the main striker in the forward position
- Delay Element, M53, burns for between 1.8-6 seconds (providing minimum arming distance of 100m) before initiating the charge that expels the Arming Pin from the Shutter Assembly.
- Shutter is then released to move into its armed position under pressure exerted by the shutter springs
- As cartridge decelerates, creep forward disengages the safety latch holding the main striker
- The fuze is now fully armed.
On Impact:
- On impact the windshield is crushed driving the Main Striker into the preselected M98 SQ or M76 Delay Detonator.
- The detonator function initiates the explosive train.

31
Q

*** 60mm Illum M721 w/ fuze M776 Operation from fuze functioning.

A
  • At a pre-set time the fuze functions in flight.
  • The expulsion charge ignites and ejects the candle assembly.
  • A spring ejects the parachute from the tail cone.
  • The parachute opens, slowing the descent of the burning candle which illuminates the target for at least 32 seconds at a minimum of 250, 000 candlepower.
  • M721 has a Height of Burst (HOB) of between 300 or 400 metres above groundlevel for charges 1 and 4 respectively.
32
Q

What is the main fill type and weight of the 81mm HE M821A1?

A
  • Comp A5

- 916

33
Q

What is the luminosity and burn time of the 60mm Illum VL M721?

A

Min: 250,000 Candela - 32 sec
Max: 400,000 Candela - 40 sec

34
Q

In the Fuze PD M783 what does the gear train provide?

A

100m min arming distance

35
Q

Max Ranges for 60mm Mortars?

A

approx. 3500m for all except:
- Prac = approx 3600
- Illum VL and IR = 3200-3800

36
Q

What is the minimum arming distance for the 60mm IR Illum?

A

40m

37
Q

What is the main fill and neq of the 60mm M720A1 HE Mor?

A 
PAX-21 (CAN), NEQ: 0.400
Comp B (US), NEQ: 0.403
38
Q

Label 81mm Smk RP M819 wfuze MTSQ M772

A
  • M28 Tailfin Assembly
  • M218 Propelling Charge Assembly
  • Obturator Ring
  • Shear Pin
  • Supplemental Charge Assembly
  • Safety Pin
  • Fuze MTSQ M772
  • M819 Loading Assembly
  • Tailcone Assembly
  • M752A1 Ignition Cartridge
39
Q

What are the possible settings for Mortar Fuzes?

A
  • MT
  • Impact/PD/SQ
  • Prox
  • Near Surface Burst
  • Delay
40
Q

*** Describe 81mm illum M853A1 w/fuze MTSQ M772 from functioning?

A

At the pre-selected time, the fuze functions resulting in the initiation of the fuze booster.
The internal pressure build up as a result 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 Illum 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 illuminant canister.
The parachute assembly controls the rate of descent of the illuminant canister.
Which burns a minimum period of 50 sec generating a minimum luminosity of 525,000cd and provides an effective area of illumination of approx. 1200 m dia

41
Q

What are the safety arrangements for the Fuze MTSQ DM93 mod 505.57 (4)

A
  • Safety pin and safety pull wire
  • Detents and detent ball bearings
  • Top gear
  • Firing pin bush

AT Course_NE (23 decks)

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