Rotary AC/2

Rotary AC/2
Production information
Type Ballistic (Direct, Rapid Fire)
Tech Base Inner Sphere (IS) Standard
Clan Experimental[1]
Year Availability 3062 (FS)[2]
Technical specifications
Heat 1/shot[3][4]
Damage 2/shot[3][4]
Short Range Inner Sphere = 1-6[3]

Clan = 1-8[4]

Medium Range Inner Sphere = 7-12[3]

Clan = 9-17[4]

Long Range Inner Sphere = 13-18[3]

Clan = 18-25[4]

Aerospace Range Inner Sphere = Medium[3]

Clan = Extreme[4]

Tons 8[3][5]
Critical Slots Inner Sphere = 3[3]

Clan = 4[5]

Ammo Per Ton 45[3][3]
Cost (unloaded) 175,000[5]
Ammo Cost (per ton) 3,000[5]
BV (1.0) 118[citation needed]
BV (2.0) Inner Sphere: 118[6] / 15 (Ammo)[6]

Clan: 161[7] / 20 (Ammo)[7]


Developed in 3062 by the Federated Commonwealth, the Rotary Autocannon/2 is based only loosely on the Autocannon/2. While it has the same bore, it is capable of firing up to six times as many rounds as its standard cousin, allowing it to deal three times the damage of even an Ultra AC/2 (while the Inner Sphere variants suffer from a minor drop to effective range). The weapon may fire up to six times in a turn, with each additional shot giving the potential for increased damage. At the same time, each extra shot increases the amount of heat the autocannon builds and increases the chance for a jam. Like Ultra autocannons, Rotary autocannons are unable to make use of special munitions.[2]

Though initially prototyped in the mid-3050s it wasn't until the Light Autocannon entered production that the Rotary Autocannon became viable. The lighter weight barrel of the LAC was mated to a stronger breech derived from Ultra Autocannon to create the RAC.[8]

Clan Diamond Shark's engineers created their own Clan-tech version of the RAC/2, starting development in 3069, producing prototypes in 3073,[1] and finally starting line production in 3104 with the Clan-RAC/2 becoming widely available by 3145.[9]


The Rotary AC/2 is manufactured on the following planets:

General Motors Supernova-2[edit]

Manufactured on Manufactured by Typically used in References
Ankaa DiNapoli Industries Harvester MOD [10]

Mydron Model RD[edit]

Manufactured on Manufactured by Typically used in References
El Dorado General Motors AS7-D3 Atlas III [11]

Thor 40mm[edit]

Manufactured on Manufactured by Typically used in References
Coventry Coventry Metal Works Storm Raider [12]
Furillo Nashan Diversified Sturmvogel [13]


  1. 1.0 1.1 Tactical Operations, p. 286: "Clan Rotary Autocannon (RAC)"
  2. 2.0 2.1 TechManual, pp. 207–208: "Rotary Autocannon"
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 TechManual, p. 341: "Inner Sphere Heavy Weapons and Equipment Table"
  4. 4.0 4.1 4.2 4.3 4.4 4.5 Tactical Operations, p. 404: "Heavy Weapons and Equipment Combat Data"
  5. 5.0 5.1 5.2 5.3 Tactical Operations, p. 405: "Heavy Weapons and Equipment Construction Data"
  6. 6.0 6.1 TechManual, p. 317: "Inner Sphere Weapons and Equipment BV Table"
  7. 7.0 7.1 Tactical Operations, p. 384: "Clan Weapons and Equipment BV Table"
  8. Field Manual: Federated Suns, p. 158
  9. Interstellar Operations, p. 38: "Universal Technology Advancement Table"
  10. Technical Readout: Irregulars, p. 40: "Harvester AgroMech MODs"
  11. BattleTech Technical Readout: Dark Age, p. 186
  12. Technical Readout: 3145 Lyran Commonwealth, pp. 30–31: "Storm Raider"
  13. Technical Readout: Irregulars, p. 4: "Sturmvogel Maritime Patrol WiGE"