Directed 30mm, RCL, FFR

Question 1

Boxer 30mm natures

Answer 1

CART 30mm x 173mm Armour Piercing Fin
Stabilised Discarding Sabot with Tracer (APFSDS T) DM33

CART 30mm x 173mm Kinetic Energy Time Fuzed (KETF) DM21

CART 30mm HEI-T

CART 30mm TPFDS-T

CART 30mm x 173mm Target Practice with Tracer (TP T) DM58

Cartridge 30mm x 173 MK239
Training Practice Tracer (TP T)

Question 2

How many secondary projectiles in the KEFT?

Answer 2

162 tungsten secondary projectiles (203gm)

Question 3

CARTRIDGE 30MM X 173, TARGET PRACTICE WITH TRACER, Cart 30mm x 173 APFSDS-T DM33 exposure limit

Answer 3

Daily exposure limit of 1000 rounds per day for personnel near the weapon.

Question 4

Warhead FZ 71 Explosive fill

Answer 4

Comp B (RDX/TNT 60/40)
NEQ 1.05 kg (nominal)
Tetryl 9g

Question 5

Rocket motor 2.75 Inch FZ90 MOD.2/S
Main components

Answer 5

Rocket Motor Tube (aluminium)

RF Igniter Assembly (HERO/ESD safe)

Propellant Grain (3.51 kg of SD1171 double base cylindrical rod with 8 point star centre hole + external inhibitor)

Nozzle and fin Assembly (coated steel, 3 fins, shorting clip, inner/outer seal, detent cut which locks rkt in pod)

Question 6

Rocket Motor 2.75 Inch FZ90 Indirect Firing Range

Answer 6

9.18km (indirect firing)

Question 7

WARHEAD, 2.75 INCH, HE FZ 71
Fuze Mk 352 Mod FZ 5

Funtioning

Answer 7

Two Devices lock the rotor in the unarmed position

During initial thrust set back weights in S&A move
rearwards against its spring tension (1 st lock)

Spring loaded second lock rotates on its axis

Lock has an index that locks the rotor out of
alignment

Centrifugal force is used to move the second lock by rotating it and freeing the rotor

Unbalanced rotor is now free to turn under the control of the escapement mechanism

When rotor has moved into the armed position it is lock by the use of an index and the second lock

If set back force or centrifugal force is insufficient to arm the fuze it will move back to the unarmed position and be locked into the unarmed position.

Question 8

Mk 352 Mod FZ 5 PD Fuze with Booster purpose and components

Answer 8

Mk 352 Mod FZ 5 PD Fuze with Booster

Ensures safety in handling and storage and provides a safe separation distance from the aircraft on firing.

Components

Fuze body
Safe and arming device
Nose cap assy
Booster assembly

Question 9

HEGP arming time

Answer 9

0.7-0.9 secs when subject to both 55g acceleration and 14 Hz spin at same time

Question 10

HEAT 551 Warhead Fill

Answer 10

HE filling Octol (HMX/TNT 70/30) 460g

Booster Tetryl 7.39g

Question 11

551 How many piezo electric crystals in Fuze?

Answer 11

5

Question 12

HEAT 551 Describing arming of 551

Answer 12

Holding the detonator and the connecting circuit out of alignment

The rotor is held 270 out of alignment by two mechanical safety devices (Safety sleeves)

On firing the sleeves move rearward releasing the rotor which then moves into alignment under spring tension

Question 13

HEAT 551 What do the fins achieve on the 551

Answer 13

Reducing the spin rate to approx 450 rpm

Question 14

Ricochet Distance HEAT 551

Answer 14

350m normal target Hard Target 700m

Question 15

Operating Limits Blast Overpressure HEAT 551

Answer 15

Blast Overpressure: Number of firings per firer per day (peace time):

Standing seven

Kneeling/Sitting one

Prone zero in peacetime

Question 16

Arming sequence Cart 30mm x 173mm KEFT DM21

Once fired, the projectile accelerates along the barrel and as it passes the — — — — and — — (MVPB) at the muzzle, its — is measured. The MVPB subsequently corrects the — setting time for each individual — based on — information, via an — — method. After leaving the barrel, the — of the projectile will mechanically swing the — with the — safety device in line with the explosive train to mechanically —the —. Mechanical arming occurs at a distance of approximately — from the barrel.

During initial set-back the — — uses the principles of — induction to charge a capacitor. The induced — — is used to program the fuze, arm it — and to activate the — - —function. Electronic arming of the fuze occurs — after launching of the projectile.

When the programmed fuze setting — is reached, a —from the E— T— M— (ETM) starts the — process. The electric i—r initiates the explosive train and the — is —. A lethal — of spin-stabilised — — —- is formed, which significantly increases — —, especially at — ranges.

Answer 16

Once fired, the projectile accelerates along the barrel and as it passes the Rheinmetall Muzzle Velocity Measuring and Programming Base (MVPB) at the muzzle, its velocity is measured. The MVPB subsequently corrects the fuze setting time for each individual round based on target information, via an electromagnetic induction method. After leaving the barrel, the rotation of the projectile will mechanically swing the rotor with the detonator safety device in line with the explosive train to mechanically arm the fuze. Mechanical arming occurs at a distance of approximately 70m from the barrel.

During initial set-back the surge generator uses the principles of electromagnetic induction to charge a capacitor. The induced surge energy is used to program the fuze, arm it electronically and to activate the self-destruct function. Electronic arming of the fuze occurs 64ms after launching of the projectile.

When the programmed fuze setting time is reached, a signal from the Electronic Timer Module (ETM) starts the expulsion process. The electric igniter initiates the explosive train and the payload is ejected. A lethal cone of spin-stabilised tungsten sub-projectiles is formed, which significantly increases hit probability, especially at extended ranges.

Question 17

HE 441B Warhead fill

Answer 17

The steel body encloses two neoprene rubber inserts that contain a total of 800 steel balls (approximately).
The inserts surround the main HE filling of 345g RDX/TNT.

Question 18

84mm High Explosive Dual Purpose
(HEDP) 502 main components

Answer 18

HEDP 502 Projectile Assembly Shaped charge
590g Octol

Cartridge Case A ssembly 340g NK 1287
propellant

Question 19

469B fill and burster

Answer 19

Smoke Composition( 800gm titanium tetrachloride(TiC1 4 absorbed by pulverous synthetic calcium silicate)

Burster Charge(12gm RDX/TNT)

Question 20

441B arming distance

Answer 20

20m - 70m

Question 21

441B range

Answer 21

150-1000m

Question 22

66mm fill (main and booster)

Answer 22

Main Octol 315g
Booster Comp A5 5.6g

Question 23

66mm initiation

Answer 23

piezo electric crystals crushed send current to fuze

Question 24

66mm engagement distances

minimum operations
minimum training
Effective Range
Stationary Targets
Full Range

Answer 24

Minimum operations 25m
Minimum trg 100m
Effective 220m
Stationary Tgts 350m (with decreased 1st rnd strike probability)
Full Range 1400m

Question 25

66mm description

The — and — assembly are attached (not designed for —) to a — — and are pre-loaded within a d—, f—/a—, t—, t— s—, l—. The launcher may be — several times with a sub calibre firing system, but is not intended to be — with the M72A6 rocket.

Answer 25

The warhead and fuze assembly are attached (not designed for disassembly) to a rocket motor and are pre-loaded within a disposable, fibreglass/alloy, telescoping, tube shaped, launcher. The launcher may be reused several times with a sub calibre firing system, but is not intended to be reloaded with the M72A6 rocket.

Question 26

Answer 26

Question 27

Answer 27

Question 28

Answer 28

Question 29

Answer 29

Question 30

ASM 509 fill

Answer 30

Warhead 2kg PAX-47 (HMX 40% Al 40% binders/plasticisers20%)
Booster 9g PBXN-5

Question 31

FILLS (main/booster)

66mm
HE 441B
HEAT 551
HEDP 502
HEGP FZ 71
ASM 509
ILLUME 545
SMK 469B

Answer 31

66mm
Main Octol 315g
Booster Comp A5 5.6g

441B
two neoprene rubber inserts with approx. 800 steel balls
Main RDX/TNT 345g.
Booster PBXN-5 2.7g

551
Main Octol (HMX/TNT 70/30) 460g
Booster Tetryl 7.39g

502
590g Octol

FZ 71
Main Comp B (RDX/TNT 60/40) 1.05 kg (nominal)
Booster 9g tetryl

ASM 509
Main PAX-47 (HMX 40% Al 40% binders/plasticisers 20%) 2kg
Booster PBXN-5 9g

545/545C
Mg/NaNO3 570g

469B
Main (Smoke) TiCl4/hydrous calcium silicate 800g
Burster RDX/TNT/wax 12g

Question 32

ASM 509 detonator held ____ out of alignment by the SAI

Answer 32

90°

Question 33

HEAT 551 targets

Answer 33

Armoured fighting vehicles (inc. skirting plates and grids), also concrete bunkers or landing craft and fragmentation of body for personnel

Question 34

66mm arming distance/time, MV, ToF 250m, dispersion 250m.

Answer 34

12m/.67 secs, 200m/s, 1.4 secs, 1.5 mils

Question 35

66mm PIBD modes, armour pen

Answer 35

Impact, Graze (30°), 150mm

Question 36

66mm function/malfunction

Answer 36

PIBD on impact crushes piezoelectric crystals and initiates creating EFP and jet/damaged tube launcher shoots fwd w/ RKT, user receives flash burns.

Question 37

66mm fuze name and function

Answer 37

M412A1 Set back unlocks leaves from spring loaded traverse mounted, drum shaped, spring powered rotor (shutter) which turns clockwise aligning electric detonator. Piezoelectric crystals crushed by impact send current initiates detonator. If graze wieghted graze lever moves which frees the cocked firing pin into the graze detonator.

Question 38

551 RKT motor delay function

Answer 38

RKT motor delay burns for 45ms, as proj leaves barrel. Delay ignites intermediate, intermediate ignites ignition charge, initiating RKT motor charge, which burns for 1.5 seconds at 8.5 MPa and increases velocity of proj. To ensure effective ignition of rocket motor charge, delay unit expelled from nozzle when rkt motor pressure > 3MPa - (15m in front of wpn)., keeps travelling in line with proj at low velocity.