DS - RCL Flashcards
What does SAI mean?
Safety Arming Initiation
At what distance will the SAI arm itself after firing?
12-40m
Why is the CART 84mm HEDP FFV 502 classed as dual purpose?
Because it can be used in both HE or HEAT
function.
Why is the CART 84mm HEDP FFV 502 fin stabilised and not spin stabilised?
xx
So not to degrade the formation of the jet from the shaped charge.
What does 84mm HE FFV 441B use for Frag?
Identify the main fill and weight of explosive?
800 steel balls
..HE filling of 345g of RDX/TNT
What does the steel body contain?
HE 502
2 neoprene rubber inserts that contain a total of 800 steel balls
What fuze is used on
84mm HE FFV 441B?
MTSQ Stider 447 Fuze (with impact and graze function)
What two types of fuzing/action does the
MTSQ fuze FFV447 provide the user
Airburst
Impact
Describe actions of 84mm ILLUM FFV 545 after
expelling charge functions ?
Priming composition in top of candle ignites Candle & half casings forced onto projectile base, breaking shear screws Candle ejected, half casings fall away Illumination comp ignited
How many pre selected ranges does the
545C have?
What do they range from?
How many safety arrangements are there in the S.A.D?
- 7 range settings
- 300 to 2100m
- 3
What is the safety wait time for the 554C and
why?
60 min to allow capacitor bleed down
What is the minimum safe separation distance delay for the FFV 545C?
at least 40m
Cartridge 84mm HEAT FFV 551
What is the purpose of the Distance Tube?
Provide optimum stand off
Acts as a shock transmitter for the piezo-electric crystals
Cartridge 84mm HEAT FFV 551
What is the HE filling?
What is the booster?
460g of Octol (HMX/TNT 70/30)
Booster Tetryl 7.39g
Cartridge 84mm HEAT FFV 551
What is the RKT MT propellant type & QTY?
AKB 250m Double Based 270g
Cartridge 84mm HEAT FFV 551
Describe the functioning once the projectile strikes the target?
When the projectile strikes a target the five piezo-electric crystals convert the shock of impact into electrical energy
Providing the impact is of sufficient strength, the current generated will pass through the four layer diode via the contact piece and function the electric detonator in the rotor
The detonator output functions the booster pellets, which then function the main HE filling
What is the acronym ASM?
What is the Explosive type and amount of the main fill?
Anti Structure Munition
PAX-47 2.0 Kg
What are the components of the fuze?
- Det, Escarpment locking pin, Detent pin and ball
- Rotor, Rotor lock, Driving plunger, Delay Det
- Magnetic inertias pellet, and Inertia Pellet detent
If you were to encounter a UXO 84mm HEAT
Projectile, there are certain safety precautions which
you must apply. What are they and why must they be
applied?
What: Do not allow a shadow to fall across the projectile or attempt to destroy the UXO during periods of suddenly alternating sunshine and shade that would cause a 2 C change in projectile
temperature.
Why . A Piezo electric element stressed by impact is susceptible to changes
in temperature. Rapid change of 2 C or more could cause a surge of
electrical current sufficient to function the projectile.
Which ammunition type is simulated by CART 84MM
TP 552?
CART 84MM HEAT FFV 551
What are the 4 major parts of the CART 20mm/502 TRAC w/cap PERC?
- Driving Band Plastic
- Projectile and Tracer Steel
- Cartridge Case Plastic
- Safety Plate Aluminium.
What inert rounds cannot be used for weapon handling
Sectionalised
Instructional
Parts of the subcal- label the components of the Cart 20mm trace subal
- Projectile
- Igniter Comp
- Plastic Driving Band
- Ignition Hole
- Cartridge Case
- Propellant Charge
- Spacer
- Tracer
What does the slipping ring achieve?
HEAT 551
Slows spin rate down to approx 450 rpm
Subcal function of the weapon
.
84mm prac rounds match with what?
.
What does the slipping ring on the 84mm Prac achieve?
Slows spin rate from … down to…
What are the 2 major components of the Rocket 66mm HEAT M72A6 ?
Launcher
Rocket
What is the weight and type of propellant in the rocket motor group?
M7 (tubular grain) 122g
3 groups/Parts of the Rocket M72A6
Rocket Motor
M412A1 Fuze
M72A6 Warhead HE Assembly
Describe the functioning of the Rocket 66mm HEAT M72A6 on firing ?
- On setback, leaves launcher and the rotor turns clockwise
- Rate of rotation retarded by a geared escapement
- safe arming distance is 12m of flight
- after setback, fuze arming will occur
- Spring loaded escapement winds down (0.67 Sec)
- When armed, the rotor aligns the electric detonator M48 to the firing block contacts the stab percussion detonator with the graze action cocked striker and both detonators with the fuze booster pellet, achieving explosive train alignment.
Describe the functioning of the Rocket 66mm HEAT M72A6 on IMPACT ?
The ceramic piezo electric crystal element housed within the windshield at the tip of the rocket is crushed.
- Produces an electric charge, transmitted via internal wires within the inner cavity of the warhead
- The wires terminate at the contact block within the fuze
The warhead is fitted with a _____ _______ ____ ________ fuze. The fuze is designed to operate in both ______ ________ mode, using a _____-______ _______ in the nose cap, with a ______ _______ mode (with separate, inertially operated, impact detonator, fired by a ______ _______). The graze element allows for detonation at oblique strikes of up to ___ degrees, against hard targets.
- Point-Initiating Base-Detonating (PIBD)
- direct impact
- piezo-electric crystal
- backup graze
- cocked striker
- 30
M412A1 Fuze for 66mm HEAT M72A6
.
Can the 21mm Sub-Cal Launcher be re-used?
Yes
The Rocket 21 mm Practice M72A6 Sub-Calibre (M72A6-S) projectile be reused?
No
The igniter charge is located within the hollow end of the igniter assembly adjacent to the flange?
True / False
True
What targets is the HEAT 551 designed to engage?
- Armoured fighting vehicles (including those with skirting plates and grids)
- Hard targets (Concrete Bunkers and Landing Craft)
HEAT 551 Tab Data:
Min Range: Max Range: Amr Pen: Minimum Impact Angle for electric fuze: Arming Distance:
Min Range: 150m Max Range: 700m Amr Pen: 400mm Minimum Impact Angle for electric fuze :10 degrees Arming Distance: 5m to 8m
What are the standing, kneeling and crouching max number of fires for the for full cal Blast over pressure.
Standing - seven
kneeling - one
prone - Zero
safety sup etc included
What are the cook off guidelines for FFV 551
- max weapon temp of 115 degrees
- max of ten rounds fired in close succession
- A maximum of twenty-five rounds can be fired at a rate of fire of six rounds per minute.
- Rate of fire for prolonged firings is to be ‘considerably less than’ five rounds per minute.
Terminal Effects of the Illum FFV 545 and 545C?
- Candela
- Duration
- Diameter illuminated
- 650,000 cd
- 30 secs
- 400-500m diameter
Function of the 84mm Illum 545
Operation From firing
When the firing mechanism of the weapon is operated, the firing pin strikes the primer resulting in the priming composition being crushed against the anvil and causing it to ignite. The flame produced flashes through to the ignition composition causing it to ignite. This increases the flame size and temperature sufficiently to ignite the main propellant charge. The burning propellant produces a large quantity of hot gas that acts on the base of the projectile. The pressure builds until it is sufficient to overcome the case to projectile crimp. At this point the projectile is driven forward down the barrel of the weapon causing the driving band to become engaged in the rifling of the barrel and imparting spin to the projectile. Once the projectile leaves the barrel, the spin will provide stability during flight. At the same time that the projectile starts to move forward, the pressure of the propellant gases acting on the base plate of the cartridge case causes the plate to be expelled. This allows a controlled bleed of gas rearwards to act against the forces moving forward and thereby reducing the recoil on the user of the weapon.
On firing, setback forces are generated by the rapid acceleration of the projectile forward. This force pushes the hammer, containing the detonator, against a spring and into the firing pin, causing it to function. The flame generated passes through the flash channel in the arming and firing mechanism to the igniter composition creating ignition. The burning igniter composition then starts the delay composition burning. At the completion of the delay the flame initiates the booster pellets. The flame from the burning pellets passes down a flash channel and initiates the expelling charge in the base of the fuze. The expelling charge produces a large volume of gas that forces against the illuminating canister. This force is transmitted through the canister to the parachute and then to the projectile base. Once sufficient pressure is reached, the pins retaining the projectile base in position are sheared and the canister, parachute and projectile base are expelled from the body of the projectile. During this process the hot gas also burns through the thin metal of the canister and ignites the illuminating composition below. The parachute then ejects and plumes from the body as the half casings are stripped away by wind force. The retarding effect of the parachute slows the decent of the burning illuminate to approximately 5 metres per second. The composition continues to burn for approximately 30 seconds.
What must be removed from the cap before firing?
Rubber hood and safety pin
Function of the 84mm Illum 545
Operation Before Firing
Prior to firing, the rubber hood and then the safety pin are removed from the fuze. The safety pin or the setting key is then used to set the fuze to the desired burst range. The round can then be loaded to the weapon. To fire the round the firer must angle the weapon at the required elevation. At all ranges between 500 and 1800 metres the elevation is 20 degrees. At short ranges of 300 to 400 metres and long ranges of 1900 to 2300 metres an angle of 25 degrees must be used. Both elevations provide the correct burst height of 200 metres above the ground at the selected range. The two elevations can be obtained by means of a luminous pendulum flare sight that is easily attached to the telescopic sight of the weapon.
Cart 84mm HEAT FFV 551
What is the NEQ for energetic compositions for the Warhead? (2)
HE Filling - Octol - 460g
Booster - Tetryl - 7.39g
Name and Label the fuze for
Cart 84mm Illum FFV 545
14 (fm 12 o’clock)
Name: Fuze Safety pin Hammer Spring Channel Time train Flash hole Fuze body Firing pin Expelling charge Pellet Pellet Broadcloth washer Time-train ring Igniter Composition
Label the parts for the fuze on the
Cart 84mm HEAT FFV 551
7 and 6
Name: Electric fuze system
Safety spring plate Safety Sleeve A Stop screw Rotor Electric Detonator Arming spring Safety sleeve B
Safety sleeve B Rotor Safety sleeve A Electric detonator Contact piece Contact spring
Name the compositions for main fills for the following:
66mm HEAT M72A6
21mm Prac M72A6-S
66mm: OCTOL 315g
21mm: inert head
Name the compositions for main fills for the following 84mm natures:
Illum 545 illum 545C Smoke 469B . . .
545: Magnesium/Sodium Nitrate 570g
545C: NOL 82 557g
469B: (TICL) Titanium Tetrachloride 800g
Name the compositions for main fills for the following 84mm natures:
APTP-T 141
TP-T 552
Cart 20mm / 502 TRAC w/ Perc
141: inert
552: inert
Cart 20mm:
Name the compositions for main fills for the following 84mm natures:
HEAT 551
HEDP 502
HE 441B
ASM 509
551: OCTOL 460g
502: Octol 590g
441B: HE RDX/TNT 345g
509: PAX-47 2kg
What is Octol made from and ratio?
HMX/TNT (70/30)
What is the match for each of the following training / Prac rounds?
21mm Sub-cal
84mm TP-T
84mm TP 552
HEAT M72A6
Identify the fuze for the 84mm HE 441B/441D?
What type of fuze (WRT function/s)
MTSQ Stidar 447-1 Fuze
MTSQ impact fuze with graze function
Cart 84mm HEDP 502
Amr Pen?
Angles of attck (min/max)?
Why fin stabilised not spin?
> 100mm
- 15 to 75 degrees
- So the spin doesn’t degrade the performance of the shaped charge
What are the 3 groups of the M72A6 rocket?
Fin group rocket motor
M412A1 PIBD Fuze
M72A6 Warhead Assembly
What type of fuze
HEAT M72A6
M412A1 PIBD fuze with impact and backup graze settings
What is the blow out disc made of and what is its purpose?
84mm
Disc is made of laminated paper impregnated with phenolic resin
ruptures during firing to reduce recoil
Illuminating composition?
Magnesium/ Sodium Nitrate 570g
