Graman Artillery System: Difference between revisions
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| 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 | ||