Building Mounted Weaponry and Battle Value

The BV cost of a building which contains weaponry or defensive systems is always calculated per hex of building.

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STEP 1: Calculating Defensive Battle Rating

First, ADD the following figures:

Total Armour Factor x 2.5

Total CF x Building Factor (x 1/Damage Scale Factor [TacOps pp. 116])

Building Type Multiplier
Light 0.25
Medium 0.5
Heavy 1.0
Hardened 1.5

Total BV of all Defensive Equipment

Defensive equipment includes active probes, anti-missile systems (including AMS ammo, up to the BV of the systems themselves) and ECM suites.  Other Defensive Equipment items are identified on the Weapon and Equipment Battle Value Tables by a dagger footnote.

Next, MULTIPLY the current value by 0.5.  The final result is the structure’s Defensive Battle Rating (DBR).

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STEP 2: Calculate Offensive Battle Rating

Calculate the Offensive Battle Rating.  This is done by MULTIPLYING the Weapon Battle Rating by the Speed Factor for an immobile Structure (which is 0.2).

Calculate the Weapons Battle Rating

First, add the BV rating of all remaining weapons and equipment (not counted in the DBR).  For each weapon multiply their BV cost by their mounting:

Mounting Multiplier
Fixed 0.5
Pintle 0.75
Turret 1

Fixed mounts are assigned to one hex edge.  They have a fire arc the same as a vehicle forward fire arc in that direction.

Pintle mounts have a fire arc of 180 degrees e.g. North or south (or another orientation)

Turrets can rotate 360 degrees.  All weapons on a turret must face in the same direction.

To prevent excessive ammo for distorting the Battle Value, the BV added for Ammunition cannot exceed the Battle Value of the weapon itself.  Ig the ammo BV exceeds that of the weapon, reduce the ammo BV to match the unmodified weapon BV (weapon of that type).

Multiply the Weapon Battle Rating by the speed factor for an immobile structure (which is 0.2).

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STEP 3: Calculate the Final BV

Add the Defensive Battle Rating and Offensive Battle ratings and round the resulting sum to the nearest whole number (0.5 rounds up).  This is the structure’s BV.

The formula yields a BV of a structure with a gunnery skill of 4.  If personnel with a different skill level controls the structure, multiply the BV by the appropriate skill level multiplier [p.314 TM].

Optional Extras

Gun Emplacements [TacOps pp. 117]

Gun emplacements are sing-hex buildings designed strictly to provide a weapons platform and protection for the crew manning those weapons.  Gun emplacements can’t be entered as a building by non-infantry units.  Infantry units inside a gun emplacement can’t fire at targets outside the building.

Advanced Building Critical Damage [TacOps pp 121]

If buildings have weapons then these optional rules should be used.

Automated Weapons [TacOps. P 133]

Automated weapons have a base gunnery skill of 5.  When calculating BV cost for Gunnery us a gunnery skill of 1 less than the automated weapons gunnery skill.  This value can’t be changed.

Automated weapons ignore any critical hit which would affect crew.

Power Generation [TacOps pp. 134]

Weapon emplacements with internal power plants pay standard BV costs.

Weapon emplacements which are remotely powered by a generator have their BV modified by the number of Generators they are attached to.  If all generators are destroyed all turrets are disabled.

Number of generators Multiplier
1 0.25
2 0.5
3 0.75
4 0.9
5+ 1.0

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Examples

Building Defence Turret

  • Technology: Inner Sphere
  • Armor: 0
  • Building Type: Medium (CF 40) [x0.5 BV]
  • Building Class: Normal [x1 BV]
  • Defensive systems: None [0 BV]
  • Offensive Systems: Turret x [1] 2 x Medium Lasers [46BV Each]
  • Speed Factor: 0.1

DBR = [(0x2.5) + (40×0.5)] X 0.5= 20

OBR = [46×2] x 0.2 = 19.2

DRB + OBR = 20 + 19.2 = 39.2 rounded to 39 BV

Forward Base Laser Defence Turret

  • Technology: Inner Sphere
  • Armor: 0
  • Building Type: Hardened (CF 120) [x0.5 BV]
  • Building Class: Gun Emplacement [x1 BV]
  • Defensive systems: None [0 BV]
  • Offensive Systems: Turret x [1] 2 x Medium Lasers [46BV Each]
  • Speed Factor: 0.1

DBR = [(0x2.5) + [120×1.5)] X 0.5= 180

OBR = [46×2] x 0.2 = 19.2 BV

DRB + OBR = 180 + 19.2 = 199.2 rounded to 199 BV

MOTHER OF ALL TURRETS

  • Technology: Inner Sphere
  • Armor: 150
  • Building Type: Hardened (CF 150)
  • Building Class: Gun emplacement (x0.5)
  • Defensive systems:
    • Turret [x1]: Anti-Missile System + 3 Tons of Ammo [32 = (11 x 3) = 64 BV (Due to max ammo BV value]
  • Offensive Systems:
    • Turret [x1]: 2 x Gause Rifle + 6 Tons of Ammo [(320 x 2) + (40 x 6)] = 960 BV
    • Pintel [x0.75]: 1 x AC20 + 4 Tons of Ammo [(178 x 1) + (22 x 4)] = 199.5 BV
    • Fixed [x0.5]: 3 x Machine Guns + 6 tons of Ammo [(5 x 3) + (1 x 6)] = 10.5 BV
  • Speed Factor: 0.1

DBR = ([((150 x 2.5) + (150 x 1.5)] * (1/0.5)) + [64]) X 0.5 = 675 BV

OBR = ([960] + [199.5] + [10.5]) x 0.2 = 234

DRB + OBR = 675 + 234 = 909 BV

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