Detailed study Mortars Flashcards
What is the primary ignition cart used on 60mm mortars?
M702 Ignition Cart
What is the candle power for 60mm Illum M721?
Max 400 000 for 40secs
Min 250 000 for 32secs
What is the candle power for 60mm IR Illum M767?
500 an near IR wavelength of the electromagnetic part of the spectrum (between 60 to 90um)
How does the fuse PD M775 work?
Safety pin is removed. On acceleration, 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 centrifugal 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. It produces a flash, audible sound and smoke to simulate HE
How does fuse MTSQ M776 work?
The time is set using the fuse setter. The safety pin is removed before firing. When the round is fired and an acceleration of 500g is reached, the setback sleeve withdrawals, allowing setback pins to retract, unlatching the pallet of the escapement. The setback pins lower collars disengage, setting the spring-loaded detonator housing free to turn after the detonator housing locking shaft extension has turned out of the slot in the detonator housing. The barrel continues to turn until the gap in its crown aligns with the tongue of the firing lever. The striker bushing spring forces the bushing downwards and forces the firing lever and the release lever apart, disengaging the claws, striking the firing pin head and thrusting it into the detonator, this initiating the firing train at the pre set time.
How does the M783 work?
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. Aligning 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.
What is the arming distance for the M783 MO fuse?
100m
What are the four settings for the M734A1?
Prox - 14ft
NSB - 7ft
Impact
Delay - 50-150ms
Label the 60mm IR Illum mortar.
Ignition cart M702 Fin M27 Propelling charge M204/M235 Base plate Illuminant First fire composition Time fuse M776
What is the augmenting charge used for the M0221A1?
AR2205 Single base x 6
What is the minimum safety arming distance for MTSQ M772?
40m
How does the 81mm Illum work?
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.
How many wedges and what weight are in the 81mm Smk RP?
28 wedges at 43g
What is in the 81mm Smk RP?
M752A1 Ignition Cart
M218 Propelling Charge
M819 Loading Assembly
What is the GAM for and what is its life expectancy?
The GAM is used to encapsulate phosphine gases.
7-10 year life expectancy
