Internal Structure

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Equipment Overview
Standard Structure 
Standard Structure.png
Equipment Type: Structure 
Critical Slots: 0  


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Equipment Overview
Endo-Steel Structure 
Endo Steel Structure.png
Equipment Type: Structure 
Critical Slots: 14  


[3][4]


Overview[edit | edit source]


The Internal Structure of a BattleMech forms the skeletal structure of the 'Mech to which all components are mounted.


Standard Internal Structure

The Standard Internal Structure of a 'Mech weighs 10% of its max. tonnage (i.e. on a 100 ton Atlas the internal structure weighs 10 tons).

It is the least bulky structure and does not take up any critical hit slots. It is also the least expensive and converting a 'Mech to it costs the 'Mechs maximum tonnage x 5,000 Cbill.png (on an Atlas, it would cost 500,000 Cbill.png).


Endo-Steel Internal Structure

The Endo-Steel Internal Structure of a 'Mech weighs only 5% of its max. tonnage (i.e. on a 100 ton Atlas, it would only take up 5 tons), or half as much as Standard Internal Structure, but it requires 14 Critical Slots on Inner Sphere 'Mechs and 7 slots on Clan 'Mechs.

However, converting to Endo-Steel costs the 'Mechs max. tonnage x 10,000 Cbill.png (on an Atlas, it would cost 1,000,000 Cbill.png.

Internal Structure Health[edit | edit source]


Depending on the 'Mechs tonnage, each of its locations has a certain amount of internal health, equal to 1/2 of the maximum amount of armor that can be mounted in that component. The one exception is the Head, which receives 18 internal hit points. (Note: The total health of the head component is somewhat disputed as some users claim to be able to "headshot" or "one-shot" 'Mechs with only a 35 point alpha strike. The maximum suggested here is 36, and could be less depending on the amount of armor allocated to the Head component.)


Number of equipable internal hit points with different 'Mech weights:

Tonnage Internal Structure
'Mech total HD RA + LA RL + LL RT CT LT
20 78 18 6 8 10 12 10
25 98 18 8 12 12 16 12
30 114 18 10 14 14 20 14
35 128 18 12 16 16 22 16
40 146 18 12 20 20 24 20
45 162 18 14 22 22 28 22
50 178 18 16 24 24 32 24
55 194 18 18 26 26 36 26
60 210 18 20 28 28 40 28
65 220 18 20 30 30 42 30
70 226 18 22 30 30 44 30
75 240 18 24 32 32 46 32
80 256 18 26 34 34 50 34
85 272 18 28 36 36 54 36
90 288 18 30 38 38 58 38
95 302 18 32 40 40 60 40
100 316 18 34 42 42 62 42

Note:

  • Each arm and leg has the given amount of internal hit points.
  • Each torso does not split internal hit points front/rear is they do for armor allocation.


Regarding Standard vs. Endo-Steel:
A 'Mechs maximum amount of internal health is independent of the type of internal structure equipped.
Different types of internal structure result in a different weight (tons) with equal health.
The trade-in for weight saving comes in the consumption of Critical Slots.

Taking Damage[edit | edit source]

When a battlemech's armour has been destroyed the battlemech starts to take damage to its internal structure, weapons systems and other equipment. When the internal structure of a battlemech's head, center torso or both legs are destroyed, the battlemech is destroyed. If an XL engine is fitted to the battlemech, the destruction of a side torso will also destroy the battlemech.

Savings[edit | edit source]

Compared to the weight saving of Armor, switching to an advanced internal structure provides a greater saving, i.e.:

Commando (25 t): Armor (Standard : Ferro Fibrous) 8.06 : 7.47 t vs. Structure (Standard : Endo Steel) 2.5 : 1.5 t = armor 0.59 t vs. structure 1 t
Cicada (40 t): Armor 12.56 : 11.65 t vs. structure 4 : 2 t = armor 0.91 t vs. structure 2 t
Hunchback or Centurion (50 t): Armor 15.57 : 14.44 t vs. structure 5 : 2.5 t = armor 1.13 t vs. structure 2.5 t
Cataphract (70 t): Armor 20.56 : 19.11 t vs. structure 7 : 3.5 t = armor 1.45 t vs. structure 3.5 t
Atlas (100 t): Armor 29.19 : 27.13 t vs. structure 10 : 5 t = armor 2.06 t vs. structure 5 t

Upgrading the Structure[edit | edit source]

To switch between Standard and Endo-Steel Internal Structure, use the Upgrades tab in the Mech Lab and choose structure.

  • Switching to Endo-Steel requires that you have enough money and Critical Spaces available on your 'Mech.
  • Switching to Standard Structure requires that you have enough money and tonnage available.
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