Brace to Fire

== Basic Concept ==
Brace to Fire, or Tubthumping, is a mechanic which makes large bore ballistic weapons and artillery add instability to the firing 'Mech. Any weapon which has this trait will list it clearly in the tooltip.
=== AI ===
Due to the complexity of the AI in the game there was no way to make it understand the concept of Brace to Fire, and as such you will often see the AI fire such weapons even though its instability is already high.
However, to mitigate this problem at higher levels - and especially for Kill Teams lances - the AI can gain some special reductions to the instability added, this is not a bug.
== Instability Added ==
The base instability added per weapon fired varies based on the weapon type and size, but generally the larger weapon and the more damage it can do, the higher the instability added. If the weapon is capable of multiple firing modes, the general rule is the more or larger shots fired in the same attack, the higher the increase in instability.
The instability gained is always listed in the weapon's tooltip and is also available on the wiki (if the weapon is not marked as classified). If you encounter a weapon missing the value in the tooltip yet causing instability, report it to the developers as it is a bug.
Example Instability
Weapon 	Type 	Instability	Note
Long Tom Artillery	Direct Fire mode	+64 	
Railgun (C) 	Railgun 	100 	
Rotary AC/20 (C) 	Autocannon 	8 to 48 	Instability increases with number of shots fired
Spinal Mount HGR 	Gauss Rifle 	52 	
==== Reduce Added Instability ====
There are several ways to reduce the amount of instability firing a weapon will add:
* Brace previous turn - The best way to reduce the amount of instability is to Brace the round before and not move the current turn before firing the weapons. This will reduce the final amount of instability by 100.
** Note: Rotating the 'Mech before firing does not count as a movement.
* MechWarrior Piloting Skill - Every level of the Piloting skill the MechWarrior operating the 'Mech has, inherently reduces any stability damage taken by 2%.
* Equipment or Quirks - There are several types of equipment, such as Gyros and Superheavy Frames, as well as Quirks that lower the amount of instability.
* Special types of Mechs - All QuadMechs inherently reduce the amount of instability by -50, and entering a QuadMech's Siege Mode reduces the final amount by another -25. Quadvees reduce the amount by -40.
* Chassis tonnage weight - The higher the tonnage of the 'Mech mounting the weapon, the lower amount of instability added will be. See the table below.
*Vehicle - All vehicles are inherently immune to stability effects from firing weapons. This includes QuadVees in vehicle form.
The following graph and table shows the base reduction of the instability amount by the 'Mech's tonnage. For 'Mechs above 100 tons (Superheavy), the reduction includes the value from the Superheavy Frame.
Tonnage Instability Chance Reduction
Tonnage	Instability Reduction	Tonnage	Instability Reduction
5 	-1 	105 	-29.51
10 	-2 	110 	-311
15 	-3 	115 	-32.51
20 	-4 	120 	-341
25 	-5 	125 	-43.51
30 	-6 	130 	-451
35 	-7 	135 	-46.51
40 	-8 	140 	-481
45 	-9 	145 	-49.51
50 	-10 	150 	-591
55 	-11 	155 	-60.51
60 	-12 	160 	-621
65 	-13 	165 	-63.51
70 	-14 	170 	-651
75 	-15 	175 	-74.51
80 	-16 	180 	-761
85 	-17 	185 	-77.51
90 	-18 	190 	-791
95 	-19 	195 	-80.51
100 	-20 	200 	-901
1) Includes Superheavy Frame
==Actual Maths==
These are the actual formulas to calculate the actual amount of instability added. They are mainly provided as an extra, and will not be explained in detail by the Roguetech Crew even if asked directly.
 Weapons: Combined Value of all Weapons firing with Instability effect
 Brace: If braced previous turn and no movement this turn => -100
 Tonnage: Mech Tonnage x 0.2
 Tonnage Bonus: Mech Tonnage > 100 => Mech Tonnage x 0.1
 Piloting: Piloting Level x 0.02
 Equipment: The combined reduction to Instability of all equipment
 Total Instability = (Weapons - (Brace + Tonnage + Bonus + Equipment)) x Piloting
 Category:Guides