Editing Internal Structure

{{Semantic Equipment |image=Standard Structure.png |name=Standard Structure |type=Structure |slots=0  }}
{| class="floatright"
|-
|
{{Semantic Equipment |image=Endo Steel Structure.png |name=Endo-Steel Structure |type=Structure  |slots=14  }}
|}

==Overview==
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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 [[Image:Cbill.png|x12px]] (on an ''Atlas'', it would cost 500,000 [[Image:Cbill.png|x12px]]).


;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 [[Image:Cbill.png|x12px]] (on an ''Atlas'', it would cost 1,000,000 [[Image:Cbill.png|x12px]].

==Internal Structure Health==
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Depending on the 'Mechs [[:Category:Mechs#Weight/Tonnage|tonnage]], each of its [[Mech Manual#Components|locations]] has a certain amount of internal health.


Number of equipable internal hit points with different 'Mech weights:
{| class="wikitable" style="text-align:center"
|-
! Tonnage !! colspan="7"| Internal Structure
|-
!style="width: 5em"| 'Mech 
!style="width: 5em"| total 
!style="width: 5em"| HD 
!style="width: 5em"| RA + LA 
!style="width: 5em"| RL + LL 
!style="width: 5em"| RT 
!style="width: 5em"| CT
!style="width: 5em"| 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===
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===
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===
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.