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Formative 11 Revision > Formative 11 Revision > Flashcards

Formative 11 Revision Flashcards

1
Q

What are the major components of the Fuze MR3005?

A
  • Fuze Body
  • Fuze Base
  • Firing Pin assembly
  • Rotor assembly
  • Priming Relay
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2
Q

When the ___ of the firing pin spring is greater than the _____, the firing pin will begin to move _____ . This movement is ____ by balls acting on the ____ _____ ramp. At this stage the fuze is ____ ____ and is at least 15m from the barrel

Self destruct will occur when _____

A

-When the FORCE of the firing pin spring is greater than that of the SETBACK FORCE, the firing pin will begin to
move FORWARD. This movement is IMPEDEDE by balls acting on the SELF DESTRUCT ramp. At this stage the fuze is FULLY ARMED and is at least 15m from the barrel.
-The projectile has not hit a target after 6-16 secs time of flight

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3
Q

Why is there a slipping ring on the 84mm HEAT?

A

-As not to impart too much spin and provide forward obturation

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4
Q

What does the distance tube do?

A
  • Provide optimum stand-ff

- Acts as a shock transmitter for the piezo-electric crystals

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5
Q

What 84mm Prac variants are there and what is their difference to the 84mm HEAT?

A
  • Cart 84mm Prac ATK TPT 141
  • Cart 84mm Prac TP 552
  • It is ballistically matched to the Cart 84mm HEAT 551 but has no fuze system, booster or explosive warhead and is fin stabilised
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6
Q

Describe the functioning of a 84mm HEAT after firing

A
  • Primer ignites propellant in cart case.
  • Propellant gases acting on the rear of the projectile ignites rocket motor delay
  • Rocket motor delay burns for approx 45 miliseconds and prijectile leaves barrel
  • Delay composition ignited intermediate and ignition charge
  • Ignition charge initiates rocket motor charge, burns for approx 1.5 seconds
  • Delay unit ejected from rocket at approx 15m from the muzzle
  • Setback force moves both safety sleeves rearwards, unlocks rotor
  • Arming spring moves rotor 270 degrees to the armed position
  • Detonator is now connected to firing circuit by the contact piece
  • On impact, 5 piezo-electric crystals convert impact shock into electrical current
  • Current passes through four layer diode via contact piece and funcstions electric detonator in rotor.
  • Detonator functions booster pellets, in turns functions HE fill and forms jets
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7
Q

What are some precautions of the 84mm HEAT and why?

A

-A UXO is extremely sensitive to electro static discharge and must not be subject to vibration

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8
Q

Why is the 84mm HEDP fin stabilised?

A

-So not to degrade the formation of the jet from the shape charge

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9
Q

Label the 84mm HEDP

A

label diagram

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10
Q

A _______ in the fuze allows the projectile to pass through ______ ______ equivalent to _____ planks from _____ without functioning.

A

A MASK SAFETY in the fuze allows the projectile to pass through MULTIPLE TARGETS equivalent to 40MM PINE planks from 0 TO 20M without functioning.

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11
Q

How many pre selection ranges are on the 84mm Illum 545C?

A
  • Seven

- 300m-2100m

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12
Q

What is the safety wait time for the 554C and why?

A

-60 minutes to allow capacitor bleed down

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13
Q

How many safety arrangements are there on the F555 (SAD) fuze and what are they?

A
  • Three
  • Inertial safety
  • Centrifugal safety
  • Combined safety
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14
Q

Why are there raised ridges on the 84mm Illum 545C?

A

-For fuze setting in low light

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15
Q

What is the Fuze V447 MTSQ fitted to?

A

-Cart 84mm HE 411B

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16
Q

Describe the function of the Fuze V447 MTSQ from firing to ‘set time’ for airburst

A
  • Firing pin strikes the primer causing priming composition to ignite
  • Priming composition ignites propellant
  • Propellant hot gases push the projectile forward down the barrel of the weapon
  • Driving band is engaged in the rifling and imparts spin
  • As the projectile starts to move forward, the rear blow out disc is expelled
  • Setback forces lock nose cap in position at set time and release hand of the clockwork mechanism
  • Clockwork mech starts
  • Centrifugal and setback forces act concurrently to unlock striker, firing pin locking plunger and rotate the shutter
  • Once the set time has been reached, the striker is release and impacts the clockwork detonator causing it to function
17
Q

What is the Fuze BD 502 fitted to?

A

-Cart 84mm HEDP 502

18
Q

What is the failsafe feature on the Fuze BD 502

A

-If the escarpment is release during transportation or handling prior to the driving plunger being pushed down, the rotor will be driven around 260 degrees to ensure the fuze remains safe

19
Q

What is newtons third law?

A

-For every action, there is an equal and opposite reaction

20
Q

What is a BBDA?

A

-Back Blast Danger Area

21
Q

Label the FV 502 SAI safety features

A

Labels diagram

22
Q

What are the major components of the RKT 66mm M72A6?

A
  • Rocket

- Launcher

23
Q

Describe the function of the RKT 66mm M412A1 Fuze from firing the impact

A
  • On setback, leaves disengage and the rotor turns clockwise
  • Rate of rotation is retarded by a geared escarpment, arms after 12m of flight
  • Once armed, rotor aligns with electric detonator M48 to the firing block contacts
  • Explosive train is aligned with graze element/cocked striker
  • On impact, piezo crystal is crushed which produces an electric charge
  • Charge is transmitted via internal cavity wires which ignites the detonator
  • Detonator initiates booster pellet and in turn the main fill (from the rear)
24
Q

What is the propellant in the RKT 66mm M72A1?

A
  • M7 tubular grain

- 122g

25
Q

What are the 7 types on warheads found on FFR?

A
  • Nuclear
  • HE
  • Chemical
  • Preformed Fragments
  • Sub munitions
  • Terminally guided munitions
  • Practice munitions
26
Q

What is the functioning of the rocket motor in the 2.75inch?

A
  • Current applied to the rocket and fuze head via the contact bands
  • Current initiates fuze head which ignites, causing black powder to ignite
  • Black powder ignites the propellant
  • Large quantity of gas ruptures closing disc and foil shield exiting the nozzle
  • Rocket accelerates down tube towards target
  • Exiting gas is deflected by grooving in nozzle imparting spin
  • On exiting, fins are deployed under spring tension
  • Fin and spin to for improved stability
  • Once propellant all burnt, fins maintain spin for remainder of trajectory
27
Q

What are some factors effecting rocket accuracy?

A
  • Surface cross winds
  • Propellant burn rates
  • Launcher induced errors
28
Q
  • During _____ ____ set back weights in ____ move ____ against its spring tension (1st lock)
  • ____ loaded second lock ____ on its axis
  • _____ ____ is used to move the ____ lock by ____ it and freeing the rotor
A
  • During INITIAL THRUST set back weights in S&A move REARWARDS against its spring tension (1st lock)
  • SPRING loaded second lock ROTATES on its axis
  • CENTRIFUGAL FORCE is used to move the SECOND lock by ROTATING it and freeing the rotor

Formative 11 Revision (1 decks)

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