Graman Artillery System

Graman Artillery System
File:Graman 76mm Shell leaving muzzle.jpg A 76mm Graman shell exiting the muzzle of a cannon during testing
Type	Guided artillery shell
Place of origin	Dniegua
Service history
Used by	Dniegua Temuair Sieuxerr Template:Country data Estovnia
Production history
Manufacturer	BAE Systems AB
Unit cost	US$53,620
Specifications
Weight	76mm: 9.75kg (Projectile weight: 5kg) 127mm : 64.1kg (Projectile weight: 46kg) 155mm: 43.7kg
Length	76mm: 37cm 127mm: 66cm 155mm: 62.5cm
Diameter	57, 76, 127 and 155 millimeters
Caliber	57mm, 76mm, 127mm, 155mm
Muzzle velocity	various
Effective firing range	76mm: 40km 127mm: 120km 155mm: 80km
Warhead	PBXN-9
Guidance system	GPS plus inertial navigation

The Graman Artillery System, also known as the Advanced Over the Horizon Artillery System, is a family of long range guided artillery munitions developed by Bofors, AB weapon systems of Dniegua. It is a GPS/IMU guided shell family utilizing low-drag, extended range designs with control surfaces on the exterior of the shell, allowing for mid-flight corrections. Developed for naval weapons originally, the shell later was used in 155mm ammunition systems, such as in the Skan-1 artillery system and the 155mm Yeoman Artillery System.

Notable for its high accuracy, naval systems are able to strike targets up to 20 degrees off boresight of the weapon, allowing for high degrees of accuracy against incoming munitions and small, fast moving craft. Each system has multifuctional fuses, with settings for Proximity, Time Delay, Impact, and Altimetric detonation.

57mm Version

The 57mm version Gramanwas developed to better suit the purpose of engaging aerial targets and incoming munitions. The higher fire rate of the 57mm cannons proves to be more effective than the 76mm canons at engaging such targets.

Specifications

Data
Weight (Projectile)	2.5kg
Weight (Complete round)	6.2kg
Length (Projectile)	312mm
Length (Complete Round)	673mm
Muzzle Velocity	1,300 m/s
Maximum Range (Unguided stage)	22 kilometers
Maximum Range (Guided)	28 Kilometers
Service Ceiling (Anti-Aircraft)	7,600 meters
Bursting Charge	.45kg HEXAL-30

76mm Version

The 76mm version of Graman was the first proposed developmental branch of the system. Intended as a way to increase the performance of existing 76mm gun systems, the Graman artillery system quickly became the primary market for the development. Theoretically increasing the accuracy and range of 76mm dual purpose guns, which were quickly approaching obsolescence, became a major selling point of Graman. The 76mm projectile is a sub-caliber , fin stabilized munition with a body diameter of 52mm. While reducing explosive payload, this new body design is more aerodynamically efficient and obtains a higher muzzle velocity, thus increasing range by nearly 10 kilometers. Able to preform mid-air flight corrections via IMU and GPS guidance, the 76mm Graman may engage targets up to twenty degrees off boresight, allowing it to strike fast moving missile, aircraft or small, fast surface contacts. It is also compatible with Temuairs UCV-AA gun system.

Specifications

Data
Weight (Projectile)	5kg
Weight (Complete round)	9.75kg
Length (Projectile)	372mm
Length (Complete Round)	912mm
Muzzle Velocity	1,200 m/s
Maximum Range (Unguided stage)	30 kilometers
Maximum Range (Guided)	40 Kilometers
Service Ceiling (Anti-Aircraft)	4,500 meters
Bursting Charge	1.06kg HEXAL-30

127mm Version

The 17mm Version quickly followed the 76mms development. Basically a scaled up version of the 76mm Graman projectile, the 127mm shell utilizes the same advancments with the notable addition of a propulsion system, allowing for rocket assisted modes. Unlike the 76mm, due to the size of the gun, the 127mm is not intended to engage fast moving targets like anti-shipping missiles or aircraft, but processes the ability to do so. Instead, this projectile is purposed for engaging surface targets more than true dual-purpose use. Like the 76mm version, it possesses the ability to engage targets in an off-boresight capacity, though it is unclear if it is to the same extent.

Specifications

Data
Weight (Projectile)	46kg
Weight (Complete round)	64.1kg
Length (Projectile)	662mm
Length (Complete Round)	1,286mm
Muzzle Velocity	1,052 m/s
Maximum Range (Unguided stage)	46 kilometers
Maximum Range (Guided)	120 Kilometers
Service Ceiling (Anti-Aircraft)	15,500 meters
Bursting Charge	4.5kg PBXN-9

155mm version

The 155mm Graman system was developed to extend the range of conventional 155mm artillery systems for land use. Unlike other Graman systems, the 155mm shell lacks the ablity to fire off bore sight, but is signifigantly more accurate than conventional artillery sytems with the advent of longer ranges.

Specifications

Data
Weight (Projectile)	43.7kg
Weight (Complete round)	43.7kg
Length (Projectile)	625mm
Length (Complete Round)	625mm (Note: Separate loading ammunition)
Muzzle Velocity	1,000 m/s
Maximum Range (Unguided stage)	52 kilometers
Maximum Range (Guided)	80 Kilometers
Service Ceiling (Anti-Aircraft)	N/A
Bursting Charge	18.6kg IMX-101