2A28 (73 mm kanón)

2A28
     
Název:
Name:
2A28 2A28
Originální název:
Original Name:
2A28
Výrobce:
Producer:
-
Období výroby:
Production Period:
DD.MM.RRRR-DD.MM.RRRR
Vyrobeno kusů:
Number of Produced:
-
Prototyp vyroben:
Prototype Built:
DD.MM.RRRR
Použití:
Use:
BVP-1, BMP-1, BPzV
Technické údaje:
Technical Data:
 
Hmotnost:
Weight:
115 kg 254 lb
Ráže:
Calibre:
73 mm
Náboj:
Cartridge:
PG-15V, OG-15v-V
Délka hlavně:
Barrel Length:
2180 mm 7ft 1,82in
Celková délka:
Overall Length:
2180 mm 7ft 1,82in
Používaná munice:
Ammo Used:
protipancierový priepalný, trieštivý -
Výkony:
Performance:
 
Maximální dostřel:
Maximum Range:
1,3 km 0.8 mi
Rychlost střelby:
Rate of Fire:
5-6 ran/min 5-6 rpm
Úsťová rychlost:
Muzzle Velocity:
665 m/s 2181.8 ft/s
Poznámka:
Note:
- -
Zdroje:
Sources:
73-мм, Гладкоствольное орудие 2A28, Техническое описание и инструкция по экслуатации, 1975 (MO ZSSR)
URL : https://www.valka.cz/2A28-73-mm-kanon-t40361#528867 Version : 0
2A28


Identification and characteristics of the cannon:
- Semi-automatic cannon vz. 71 infantry fighting vehicle is designed to destroy tanks, self-propelled guns, OTs and other armoured targets, silencing and destroying firing means in defended objects, shelters and buildings.


Characteristics:
- semi-automatic smoothbore gun
- the slide and pre-slide are braked by a liquid-brake device, which is used to reload and eject the cartridge
- the breech is wedge-shaped, vertical
- firing electrically using the vehicle's on-board mains or a spare source
- the charging is mechanical, the charging unit is electrically powered
- uses PG-15V anti-armour penetrating ammunition, with the possibility of using OG-15v-V fragmentation ammunition.
- Together with the cannon, a coupled 7.62 PKT tank machine gun and a PTRS launcher are mounted on a common cradle.
TTU of 73 mm cannon vz 71:


Initial velocity of the projectile at +150C.......................400 m/s
Maximum projectile velocity................................................................665 m/s
Powder pyrotechnic delay time......0,04 s
Burning time of the powder charge in the trajectory jet engine
- at +500C.................................................................min. 0,3 s
- at temperature - 400C...............................................................max. 0,7 s
Barrel pressure
- at +500C.........................................................max. 730kp/cm2
- at temperature -400C..........................................................min. 400kp/cm2
Throwing distance on target 2 m high...........................................................765 m
Effective firing distance......................................................................1300 m
Combat rate of fire............................................................5 to 6 rounds/min
Piercing capability of missile on armour on impact
- at an angle of 600 from normal.......................................................150 mm
- at perpendicular impact.................................................................300 mm
Weight of explosive in the warhead............................................................0,322 kg
Weight of powder charge in the track jet engine.......0,460 kg
Weight of powder charge in cartridge...............................................0,152 kg


Design data


Calibre........................................................................................73 mm
External dimensions of the cannon
- Length ...............................................................................2180 mm
- Width ................................................................................213 mm
- Height ..............................................................................322 mm
Slide clearance...........................................................................to 130 mm
Recoil force at recoil.................................................................13 t
Closing gear............................................................ wedge type
Brake fluid type........................................ethylpolysiloxane fluid
Hub length......................................................................866 to 877 mm
Number of hubs in the chest......................................................................8 pcs
Stabilizer wing span in flight.....................................................190 mm
Weight
- cannon weight.................................................................................115 kg
- Cartridge...............................................................................3.495 kg
- Projectiles.................................................................................2.615 kg
- trajectory jet engine.................................................1,560 kg
- full chest.........................................................................60 kg


The main parts of the gun, their description and purpose:


Barrel: gives the projectile the desired direction of movement and velocity, the barrel proper forms a monoblock with a smooth cylindrical bore at the rear going into the chamber, there is a circular recess at the front of the chamber for the cartridge case flange, two recesses for the ejector placement, and a notch for the passage of the primer when the breech is opened
- Composed of: barrel butt, ejectors, barrel butt liner, cap, clamp


Cradle:
- Forms the gun line and connects it to the turret breech, carries the coupled machine gun, PTRS launcher, connects the sight rod to the gun.
- rocker pins
- parallelogram rod bed
- PTRS launcher attachment


Conclusion:
- Used to close the chamber, execute the shot and, together with the ejector, eject the fired cartridge case. The breech wedge is prismatic in shape, its front surface is perpendicular to the axis of the barrel bore. In the left and right lower parts there are diamond-shaped sprues serving to guide the breech wedge in the profiled grooves of the bullets.


Breech springs:
- the breech springs lift the breech wedge to the upper position when closing the chamber, are inserted into the breech wedge's non-penetrating holes from below and rest on the cap bed with the other end


A cartridge case ejector with a bolt:
- directs the ejected cartridge down between the rounds, secures the charging trough, the clamp serves to secure the cartridge case ejector and to hold the lever and handle in the default position, connects the left and right rounds and stiffens it


Braking device:
- Absorbs the energy of the pre-slip and slide of the moving parts, returns the moving parts to the forward position when fired, and maintains them in that position at any elevation and depression allowed by the weapon
Locking Box:
-connects the electric firing circuit, supplying electric current to the electro-contact firing pin and to the bolt wedge position sensor.


Cannon electrical circuit:
- The electrical circuit of the cannon includes:
a. The electro-contact igniter circuit (firing)
b. the breech wedge position signalling circuit.
A spare parts, tools and accessories kit is provided to ensure proper maintenance and to carry out routine repairs


Aiming rudder and turret rotation gear:
Sighting rudder - is designed for sighting the gun and the machine gun coupled to it on the target in the vertical plane and for granting a canon elevation of +30 0 when setting the guide rails with PTRS on the launcher's lavalier. Aiming is performed electrically or manually. The aiming rudder is fixed by means of a bracket to the inner pour of the gun turret to the left of the cannon. Turret turning gear - a reducer with electric and manual control, for turning the turret on a ball track, the turning gear is fixed to the top ring in the front left part of the turret
URL : https://www.valka.cz/2A28-73-mm-kanon-t40361#154597 Version : 0
Source :
73-мм, Гладкоствольное орудие 2A28, Техническое описание и инструкция по экслуатации, 1975 (MO USSR).
URL : https://www.valka.cz/2A28-73-mm-kanon-t40361#387222 Version : 0
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