Test 13 - Artillery Flashcards
What is the type of fill and weight for the main fill and supplementary charge for HE M795?
Main Fill: TNT – 10.8 kg
Supplementary Charge: TNT – 136g
What are the fuzes that are able to be used in the 155mm Projectiles.
Prac M804A1 - PD M739A1 - ET M767A1 - MOFA M782 HE M1122 - PD M739A1 - ET M767A1 - MOFA M782 HE M107 - PD M739A1 - ET M767A1 - MOFA M782 HE M795 - PD M739A1 - ET M767A1 - MOFA M782 - MO PGK M1156 Smk WP M825 and Smk WP M825A1 - ET M762A1 Illum M485A2 - ET M762A1 SMART DM702A1 - ET M762A1 Excalibur XM982 - ??
What is the main fill of the HE M107 with and without supplementary charge and the fill of the supp charge?
- W/ Supp Charge: Comp B 6.985kg / Comp B 6.949kg
- WO/ Supp Charge: Comp B 7.121 kg
- Supp Charge: 136g TNT or Comp A3
What effect does the HE M107 produce at the target?
Blast and Frag (1950 fragments)
What is the effect (luminosity and burn time) produced by the 155mm Illuminating M485A2/A1 candle?
1,000,000 candela for 120 sec
What is the candle illuminate composition of M485A2/A1? (3)
- Magnesium 48.5%
- Sodium Nitrate 43.7%
- Binder 7.8%
What is the M485A2/A1 illuminate canister made of?
Metal canister with four spin retarding spring fins
What does the M485A2/A1 canister nose component consist of?
- Delay holder
- Secondary expelling charge
**Describe the operation of the M485A2 Illum from function during flight **
- During Flight, When the time interval set on the mechanical or electrical time fuze is reached, the fuze functions and the Primary Expelling Charge is ignited.
- Ignition of the expelling charge generates gas pressure and ignites the delay composition in the Delay Holder.
- The gas pressure builds up until it is sufficient to cause the shear pins at the base of the projectile to fail.
- Once the shear pins fail the contents of the projectile are ejected rearwards as a result of the internal gas pressure.
- On being expelled from the projectile the Drogue Parachute Assembly deploys, bringing the complete internal assembly into a vertical plane.
- The four spin retardant fins deploy, slowing down the rotation of the Illuminant Canister and Main Parachute Assembly.
- After approximately eight seconds the delay composition burns through and ignites the Secondary Expelling Charge.
- The secondary expelling charge ignites the main illuminant candle and expels the candle along with the main parachute.
- The burning candle descends beneath the deployed main parachute whilst producing light (equivalent to 1,000,000 candela) in the visible spectrum for a nominal period of 120 seconds.
What is the main fill of the 155mm WP M825A1 and construction of the projectile body?
- White Phosphorus – 5.78 kg (116 felt wedges)
- Forged Steel
What is the weight and type of burster charger and expulsion propellant charge of the M825A1?
Burster: Comp A5 – 21.2g
Expulsion: M10 – 51g
What effect is produced by the M825A1?
Smoke screen width of 125-250 metres, within 45 seconds, for 5 to 10 minutes
Label Charge bag and WP Diagram.
Charge Bag: - Igniter Pad - Base Charge - Charge 4 Increment - Charge 5 Increment - Tie Tape - Tie - Charge 7 Increment - Charge 6 Increment - Flash Reducer WP: - Ogive - Delay Element - Full Length Burster - Body M483A1 (W/O Fiberglass Wrap) - Fill Closure - Domed Steel Base 1 Inch - Plastic Insert - Thin-walled Steel Canister - Felt Wedges - Full Length Burster - Aluminium "X" ribs - Expulsion Cup
What is the meaning of a bi-directional modular increment when regarding the M232A1 MACS?
This means the propelling bag can be loaded and initiated with either end facing forward
How many increments and what is their construction and colour in the M232A1 MACS system?
- 5
- tan coloured
- coated in a NC-based combustible case
What is a single M232A1 charge bag comprised of?
- Propellant – M31A2 (Triple base) – 2.23 kg
- Igniter Bag – Black Powder – 9 grams
- Centre Core – WC 864 Ball Powder – 27 grams
- Combustible Case – Pyroxylin Plastic – 0.34 kg
How does the M232A1 charge operate on firing?
- Flash from M82 primer ignites igniter bag
- Igniter bag ignites the ball powder in the centre core
- This ignites the main charge
- Process repeats for the remainder of increments
- Gases expand propelling the projectile
What is the components and composition of the M4A2 White Bag?
- Propellant – M1 Type I (5.9kg)
- Igniter Pad – Clean Burning Igniter Powder (99.2g)
- Flash Reducer Pad – Potassium Nitrate or Potassium Sulphate (28.4g)
Where are flash reducing pads placed in the M4A2white bag and M3A1 Green bag arrangement?
White: Between charge 3 and 4
Green: Between 1 and 2, 4 and 5, end of charge 5
What are the required conditions for arming of the PD M739A1 fuze?
SQ: - No Arm – 1050 rpm - Arm – 1800 rpm Delay: - No Arm – 1075 rpm - Arm – 2025 rpm
Describe the operation of the Delay mode for the Fuze M739A1
- When the fuze is set to Delay, the M99 Detonator reaction products are blocked from M55 Detonator by the S&A assembly.
- The IDM provides a delayed initiation by measuring target penetration through a decrease in the deceleration.
- The IDM requires rotational forces and specific deceleration forces to release the IDM firing pin.
a. - On firing the spring loaded spin detents move outward under rotational loading.
b. - This frees the inertia plunger to move forward against the load of the 25g creep spring.
c. - An unbalanced detent lock rotates approximately 20° under rotational loading and prevents the spin detents from returning to their locked position.
d. - On impacting the target an inertia plunger moves forward against the 25g creep spring.
e. - The forward movement frees two balls which release a sleeve that is loaded with a 300g creep spring.
f. - When projectile deceleration decreases to 300g (or less) the spring tension moves the sleeve aft which frees two other balls.
g. - The movement of these balls releases the spring loaded firing pin.
h. - If in the armed state the IDM firing pin impacts the M55 detonator in the S&A assembly which in turn initiates the booster.
What are the arming requirements of the Fuze ET M767A1?
Setback: - No Arm – 800 g - Arm – 1000 g Rotation: - No Arm – 900 rps - Arm – 2100 rps
When does the fuze M767A1 arm in ET mode and what settings are the time increments?
- 50 ms before time set
- 0.5 to 199.9 seconds in 0.1 second intervals
When does the fuze M767A1 arm in PD mode?
0.45 seconds after leaving the barrel
