Strana 8
NR-30 Technical Specifications
Caliber 30 x 155B mm
Number of rifled
Grooves in the Barrel 16
Initial Muzzle Velocity 780±10 m/s
Weight 66,5 kg
Firing Rate min. 850 rds/min
Ammunition Round Weight 410 g
Minimum Air Pressure
for Automatic Cocking 3.8 MPa
Recoil Force max. 6000 kg
Recoil Length - Barrel 100 mm
Recoil Length - Bolt 302 mm
Main NR-30 Components
and their Function
Barrel – Defines round direction, speed and
rotation, thanks to a rifled bore with sixteen ro-
tations, in the form of a right-handed thread. In
the middle of the barrel length there are 10 holes
for the discharge of exhaust gases into the gas
cylinder. In the rear part of the barrel there is
a bullet-shaped cartridge chamber.
Breech Casing – This item is connected to the
barrel and moves 100 mm back and forth with it
in the gun housing when firing.
Breech – Consists of the head and body of the
breech assembly. The feeder inserts the car-
tridge into the head of the breech, the bolt inserts
the cartridge into the chamber and locks it. The
cartridge is fired mechanically after the chamber
is locked.
Gun Casing – Serves to guide the barrel and the
breech block during firing, and also serves as lo-
cator for the weapon control mechanisms – the
feeder, trigger, cocking cylinder and accelerators.
The gun is attached to the aircraft structure via
the gun casing. It is blocked off at the rear by
a shutter.
Cocking Cylinder – Serves to cock the weap-
on by supplying compressed air at a pressure of
50atm, which moves a slide from the rear position
and inserts a cartridge from the cartridge belt
into the slide head. It also contains a preload-
ed spring, which is compressed during cocking.
The slide is held in the rear position by a trigger.
Electromagnetic Trigger – Used to remotely
control the firing of the cannon. After applying
current, the bolt is released and thrown forward
under the pressure of the preloaded spring.
Ammunition Feeder – Used to advance the car-
tridge link belt and insert the cartridges into the
breech.
Gas Cylinder – Serves to dampen recoil when
fired. Some of the exhaust gases are directed
into it through holes in the barrel and are further
compressed there. The floating piston is com-
pressed by the barrel nut.
Recoil Accelerator – Serves to unlock the
chamber after discharging a round. The accel-
erator lever transfers the movement of the bar-
rel to the accelerator plate, which accelerates
the movement of the bolt relative to the barrel,
thereby rotating the bolt head and thus unlock-
ing the chamber.
Pre-slide Accelerator – Serves to accelerate
the movement of the breech with the cartridge
into the chamber, thereby increasing the rate of
fire.
Barrel Lock – Closes the rear part of the barrel
housing, dampens the movement of the bolt at its
rear position and keeps the cocking cylinder in
the correct position. It is connected to the barrel
housing by a thread.
Barrel
Breech casing
Breech
Gun Casing
HISTORY
INFO Eduard8
January 2025