80mm field gun

80mm field gun
Type:	Regimental artillery field gun
Place of origin:	Kildare
In service:	4558 ASC - present
Used by:	A.R.S.E. Constancia Shireroth
Designed:	4556 - 4558 ASC
Manufacturer:	Sokoku Industries / Red Bear LLC (Shirerithian copy)
Weight:	1,566 kg
Barrel length:	2.80m
Crew:	6
Shell:	80 x 350 mm
Caliber:	80 mm
Carriage:	6 Horse Team, Artillery tractor
Rate of fire:	14 RPM
Effective range:	18,000 m
Maximum range:	18,500 m

The 80mm field gun is a quick-firing field artillery piece. It was the first artillery piece which was developed by Heimat Industries.

Description of the hydro-pneumatic recoil mechanism

The gun's barrel slid back on rollers, including a set at the muzzle, when the shot is fired. The barrel is attached near the breech to a piston rod extending into an oil-filled cylinder placed just underneath the gun. When the barrel recoiled, the piston is pulled back by the barrel's recoil and thus pushes the oil through a small orifice and into a second cylinder placed underneath.

That second cylinder contains a freely floating piston which separates the surging oil from a confined volume of compressed air.

During the barrel's recoil the floating piston being pressed forward by the surging oil, compresses the air even further inside the confined volume. This action absorbs the recoil progressively as the internal air pressure rose and, at the end of recoil, generates a strong but decreasing back pressure that returns the gun forward to its original position.