Left, the cutaway model of a UOF-83D high explosive incendiary shell with a MG-31 pyrotechnic self destruct nose fuze. On the right an UP-83D drill cartridge.
The cartridges are used in the 30mm AK-230 twin barrelled naval anti aircraft revolver gun;
http://www.youtube.com/watch?v=sSXb0aE6vJA
It is mounted in an enclosed automatic 1350 mm diameter turret and aimed by radar. The gun is often used on naval vessels of the former Warchaw pact countries, both mounted on small and large vessels. Approximately 1450 guns were produced by the USSR, China produced another 300. The Chinese named it the type 69 naval gun.
The firing rate of the weapon system is 2000 rounds per minute.
Description of the UOF-83D HEI-SD cartridge:
The complete cartridge weighs 1,063 kg.
Vo: 1050 mtrs/sec.
Shellcase:
The cartridge has a heavy, belted brass shellcase. It is 210 mm long. The projectile has been fixated to the shellcase with a heavy double crimp.
Projectile:
The projectile is made of drawn and machined steel. It has two red copper driving bands to withstand the 3.125 bar pressure generated by the large powder charge. The projectile is filled with a 30grams pressed in explosive incendiary charge.
Functioning of the MG-31 pyrotechnic self-destruct nose fuze;
The fuze body (1) houses all the parts. It is screwed into the fuze body with fine thread. In top is the primary safety and arming device for the firing pin (4,5,6,7,8 ), as well as the graze part (2,3) of the fuze. Below that is the aluminium housing (9), containing the secondary pyrotechnic safety (14, 15) and the pyrotechnic self destruct device (10,11,12,13).
A third safety (16) exists of a shutter type firing safety. After firing the interrupted ring bends open, allowing the rectangular shutter to move outward, releasing the hole in the center.
Below the firing safety ring (6), a sheet metal ring is placed (8 ) with four fingers at 90 degrees each on the inner circumference, pointing to the centre (8 ). The safety ring is axially fixated by the four lips. Upon firing, inertia moves the firing safety ring downward, bending the lips down. The firing safety ring fits the circular groove in the ring housing (7). With the ring in backward position , the rolled up brass safety strip (5) can unwind, releasing the firing pin (4) to move downward upon impact. At the same moment in the aluminium housing (9), inertia moves the firing cap (11) backward, riding the spring into the firing pin (10). The flame of this firing pin starts two separate pyrotechnic lines.
The first line is the secondary safety. The flame of the firing cap ignites the powder pellet (14), which blocks a brass cylinder (15), placed perpendicular and i.w.o. the centreline flame channel from moving outward. If the powder is burned away , the cylinder can move outward (centrifugal force), releasing the centreline flame channel.
The second line is the pyrotechnic self destruct mechanism. The flame from the firing cap (11) flashes through the hole in the base of the pyrotechnic fuze (12, light blue) where it climbs up, than follow the circular channel on top of the housing (9), than turning 90 degrees inward, ending in the central firing cap (13).
The flame of this firing cap moves downward into the detonator (17), exploding the projectile.
If the projectile hits the target head on, the firing pin (4) is hit backward into the firing cap (13), exploding the projectile. After leaving the barrel, the four balls (2) of the graze mechanism are thrown outward –and so forward as well as the holes point 45 degrees upward- resting against the sheet metal nose cover (3). A large chamfering is machined to the four holes on the outside of the fuze, allowing the sheet metal skin to move inward upon graze. When a graze shot occurs the sheet metal nose cover (3) is moved inward with force and speed, launching the ball(s) (2) downward inon the chamfered edge of the firing pin (4), hammering it down into the firing cap (13).
Regards, DJH
The cartridges are used in the 30mm AK-230 twin barrelled naval anti aircraft revolver gun;
http://www.youtube.com/watch?v=sSXb0aE6vJA
It is mounted in an enclosed automatic 1350 mm diameter turret and aimed by radar. The gun is often used on naval vessels of the former Warchaw pact countries, both mounted on small and large vessels. Approximately 1450 guns were produced by the USSR, China produced another 300. The Chinese named it the type 69 naval gun.
The firing rate of the weapon system is 2000 rounds per minute.
Description of the UOF-83D HEI-SD cartridge:
The complete cartridge weighs 1,063 kg.
Vo: 1050 mtrs/sec.
Shellcase:
The cartridge has a heavy, belted brass shellcase. It is 210 mm long. The projectile has been fixated to the shellcase with a heavy double crimp.
Projectile:
The projectile is made of drawn and machined steel. It has two red copper driving bands to withstand the 3.125 bar pressure generated by the large powder charge. The projectile is filled with a 30grams pressed in explosive incendiary charge.
Functioning of the MG-31 pyrotechnic self-destruct nose fuze;
The fuze body (1) houses all the parts. It is screwed into the fuze body with fine thread. In top is the primary safety and arming device for the firing pin (4,5,6,7,8 ), as well as the graze part (2,3) of the fuze. Below that is the aluminium housing (9), containing the secondary pyrotechnic safety (14, 15) and the pyrotechnic self destruct device (10,11,12,13).
A third safety (16) exists of a shutter type firing safety. After firing the interrupted ring bends open, allowing the rectangular shutter to move outward, releasing the hole in the center.
Below the firing safety ring (6), a sheet metal ring is placed (8 ) with four fingers at 90 degrees each on the inner circumference, pointing to the centre (8 ). The safety ring is axially fixated by the four lips. Upon firing, inertia moves the firing safety ring downward, bending the lips down. The firing safety ring fits the circular groove in the ring housing (7). With the ring in backward position , the rolled up brass safety strip (5) can unwind, releasing the firing pin (4) to move downward upon impact. At the same moment in the aluminium housing (9), inertia moves the firing cap (11) backward, riding the spring into the firing pin (10). The flame of this firing pin starts two separate pyrotechnic lines.
The first line is the secondary safety. The flame of the firing cap ignites the powder pellet (14), which blocks a brass cylinder (15), placed perpendicular and i.w.o. the centreline flame channel from moving outward. If the powder is burned away , the cylinder can move outward (centrifugal force), releasing the centreline flame channel.
The second line is the pyrotechnic self destruct mechanism. The flame from the firing cap (11) flashes through the hole in the base of the pyrotechnic fuze (12, light blue) where it climbs up, than follow the circular channel on top of the housing (9), than turning 90 degrees inward, ending in the central firing cap (13).
The flame of this firing cap moves downward into the detonator (17), exploding the projectile.
If the projectile hits the target head on, the firing pin (4) is hit backward into the firing cap (13), exploding the projectile. After leaving the barrel, the four balls (2) of the graze mechanism are thrown outward –and so forward as well as the holes point 45 degrees upward- resting against the sheet metal nose cover (3). A large chamfering is machined to the four holes on the outside of the fuze, allowing the sheet metal skin to move inward upon graze. When a graze shot occurs the sheet metal nose cover (3) is moved inward with force and speed, launching the ball(s) (2) downward inon the chamfered edge of the firing pin (4), hammering it down into the firing cap (13).
Regards, DJH
