Ship:Fire

<!-- __TOC__--> __NOEDITSECTION__
{{Video|AGEHZQsYzGE|width=375|Learn more about fire.}}{{AnnoWiki|content=
[[Image:240_icon_fire_small.png|left]]'''Fire''' in World of Warships is a damage-over-time effect that occurs due to damage taken from enemy high explosive shells or aircraft bomb hits.  Fire is represented visually by flames spewing from the deck or superstructure of a ship, as well as by flames along the edges of the in-game user interface.  Ships can sustain multiple fires simultaneously; each part of a ship that is on fire increases the amount of damage that a ship suffers per second.}}

== Setting Fires ==
[[File:419_ribbon_burn.png|right|thumb|The "Set on Fire" ribbon is awarded for setting fire to an enemy ship.]]
Hits from four types of ordnance can cause a ship to catch on fire:

* A high explosive shell from a main or secondary battery.
* An HE aircraft bomb.
* An HE rocket.
* A depth charge hit on a submarine.

It is impossible to cause a fire on an allied ship.<ref>[https://worldofwarships.eu/en/news/game-updates/update-076-night-battle/#misc Update 0.7.6.]</ref>

A "Set on Fire" ribbon is awarded for each individual fire set on an enemy ship.<ref>Note that the Fire ribbon is also awarded when a fire '''would''' have been set but is not because of a {{Damage Control Party}} immunity period. </ref>  

=== Fire Zones ===

Every ship has four distinct zones along its main deck that can be set on fire, fore, aft, and two amidship. Thus the maximum number of fires on a ship is four. The commander skill [[Ship:Commander#Fire Prevention|Fire Prevention]] for battleships reduces the number of fire zones to three (one amidship). Submarines can only have one active fire, in the amidship section.

== Fire Chance ==

'''Fire Chance''' (the chance a shell or bomb will set a fire) is calculated by combining a base chance for the ordnance to set a fire, 
the target ship's intrinsic resistance to fire, and certain modifiers, as shown below.

=== Fire Resistance ===

Each ship hull has an intrinsic resistance to fire.  The amount of resistance is based on ship type, ship tier, and the hull that is currently equipped (Stock or Top).  (Premium ships all have the Top Hull.)  This resistance is expressed as the '''Fire Resistance Coefficient (FRC)'''.  The lower the coefficient, the more resistant the ship is to catching fire.  
[[File:Fire_UI.png|right|thumb|The user interface will display several different indicators to let captains know their ship is on fire.  The timer shows only the duration of the most recent fire set.]]
The Fire Resistance Coefficients ('''FRC''') are shown below:

{| class="wikitable" style="text-align:center; margin:auto"
! style="width:125px; vertical-align:middle" | Ship Tier
! style="width:200px; vertical-align:middle" | [[Image:Icon default submarine.png|25px|link=]] [[File:WowsshipclassDestroyerDefault.png|link=]] [[File:WowsshipclassCruiserDefault.png|link=]][[File:WowsshipclassBattleshipDefault.png|link=]] <br>(Stock Hull)
! style="width:200px; vertical-align:middle" | [[Image:Icon default submarine.png|25px|link=]] [[File:WowsshipclassDestroyerDefault.png|link=]] [[File:WowsshipclassCruiserDefault.png|link=]][[File:WowsshipclassBattleshipDefault.png|link=]] <br>(Top Hull)
! style="width:200px; vertical-align:middle" | [[File:WowsshipclassAirCarrierDefault.png|link=]] (all)
|-
| Tier I 
| style="vertical-align:middle;" colspan="2" rowspan="2" | 1.0000
| style="vertical-align:middle;" rowspan="3" | N/A
|-
| Tier II 
|-
| Tier III 
| 1.0000
| 0.9667
|-
| Tier IV 
| 0.9334
| 0.9001
| style="vertical-align:middle;" rowspan="8" | 0.8002
|-
| Tier V
| 0.8668 
| 0.8335
|-
| Tier VI 
| 0.8002
| 0.7669
|-
| Tier VII 
| 0.7336
| 0.7003
|-
| Tier VIII 
| 0.6670
| 0.6337
|-
| Tier IX 
| 0.6004
| 0.5671
|-
| Tier X 
| 0.5338
| 0.5005
|-
| Tier XI
| N/A
| 0.4340
|}

=== Base Fire Chance ===

"Projectile Base Fire Chance" for artillery is displayed in the Port screen by mousing over the Main Battery or Secondary Armament entries in the Artillery section.  Only HE shells have a Fire Chance.  In addition, each ship entry in this wiki includes the fire chances for main and secondary HE shells. 

For aircraft bombs and rockets, the base fire chance is a characteristic of the size and type of ordnance used and varies between 4% for small rockets carried by attack squadrons and 64% for large HE bombs.  See the tables in the [[Ship:Aircraft|Aircraft]] article for more info.  The information can also be view in the Port screen by mousing over the appropriate type of squadron in the Aircraft section. 

=== The Calculation ===
The chance to set fire for a single high explosive shell hitting a ship is calculated by the following formula (the formulas for airborne rockets and bombs are similar):

<!-- {{AnnoWiki|content='''Fire Chance = ''' '''[Fire Resistance Coefficient] x ( 1 - [Damage Control Modification 1] - [Fire Prevention] ) x ( [Projectile Base Fire Chance] + [Pyrotechnician] + [Signals] - [Inertial Fuse for HE Shells])'''}} 
* The value of "Damage Control Modification 1" is 0.05 if the appropriate [[Ship:Upgrades#Tier_III.2B_Equipment_.28Slot_4.29|upgrade]] is installed; otherwise, it is zero.
* The value of "Fire Prevention" is 0.10 if a commander with the appropriate [[Ship:Commander#Fire Prevention|Commander skill]] is in command of the ship that is under attack; otherwise, it is zero.
* "Projectile Base Fire Chance" is displayed in the Port screen — for high-explosive shells — by mousing over the Main Battery information underneath the Artillery tab.  For aircraft bombs, the base fire chance is a fixed number based on the size and type of ordnance used and varies between .087 (for the 40 lb. bombs carried by ''[[Hermes]]'') and 0.64 (for the 2000lb. bombs deployed aboard ''[[Midway]]'').  See the [[Ship:Aerial_Combat#Dive Bombers|Aerial Combat page]] for more info.
* "Pyrotechnician" is 0.01 if a commander with the appropriate [[Ship:Commander#Pyrotechnician|skill]] is in command of the ship that fired the shell; otherwise, it is zero.
* "Signals" varies depending on which signals are equipped; both Victor Lima ({{Victor Lima|Size=18px}}) and India X-Ray ({{India X-Ray|Size=18px}}) can increase the fire chance of high-explosive shells.  -->

{{AnnoWiki|content= <center><big>'''Fire Chance = ''' '''FRC · ( 1 - DCM1 ) · ( 1 - FP ) · ( ( FC<sub>B</sub> · IFHE ) + DE + Σ&thinsp;S )'''</big></center>
where:
:* '''FRC''' &mdash; the ship's [[#Fire Reisistance|Fire Resistance Coefficient]] (see above).
:* '''DCM1''' &mdash; the effect of the [[Ship:Upgrades#Tier_III.2B_Equipment_.28Slot_4.29|Damage Control System Modification 1]] upgrade: 5% (0.05) with the upgrade installed, zero without.
:* '''FP''' &mdash; the effect of the <u>[[Ship:List_of_Commander_Skills|Fire Prevention]]</u> skill: 10% (0.10) with the skill, zero without.
:* '''FC<sub>B</sub>''' &mdash; the Projectile [[#Base Fire Chance|Base Fire Chance]] (see above).
:* '''IFHE''' &mdash; the effect of the <u>[[Ship:List_of_Commander_Skills|IFHE]]</u> commander skill: 50% (0.5) or 1.0 without the skill.
:* '''DE''' &mdash; the effect of the <u>[[Ship:List_of_Commander_Skills|Demolition Expert]]</u> commander skill: 0.01 with the skill, zero without.
:* '''Σ&thinsp;S''' &mdash; the sum of the effects of the mounted [[Ship:Flags#Signals|Signals]] Victor Lima {{Victor Lima|Size=18px}} and India X-Ray {{India X-Ray|Size=18px}}: +0.01 or +0.005 each depending on gun caliber, else zero.
}}

{{#block:!|As an example, we can compare the chance of a single ''[[Benson]]'' high explosive shell lighting a fire on an enemy ''[[Bismarck]]''.  
* Tier VIII ''Bismarck'' is using Hull B (Top) (FRC of 0.6337) upgraded with Damage Control System Modification 1; the crew is not skilled at <u>Fire Prevention</u>.  
* VIII ''Benson'' fires 127mm HE Mk.32 with a 5.5% base fire chance.  Her commander is a <u>Demolition Expert</u> (not <u>IFHE</u>) and is flying both the Victor Lima and India X-Ray signals.  
The fire chance (per hit) would be:<br />


:'''(0.6337) x (1 - 0.05) x (1 - 0.00) x ((0.055 * 1) + 0.01 + 0.01) = 4.52% fire chance'''

If the ''Bismarck'' commander acquires the <u>Fire Prevention</u> skill, the chance would then be:<br />


:'''(0.6337) x (1 - 0.05) x (1 - <u>0.10</u>) x ((0.055 * 1) + 0.01 + 0.01) =  4.06% fire chance'''  (90% of the above, along with limiting the maximum number of simultaneous fires to 3)

If instead ''Benson's'' commander was not a <u>Demolition Expert</u>, the chance would be:<br />


:'''(0.6337) x (1 - 0.05) x (1 - 0.00) x ((0.055 * 1) + <u>0.00</u> + 0.01) =  3.91% fire chance'''   (87% of the first example)}}

The ''Benson'' example, with its 13.5% variance in fire chance, demonstrates the effectiveness of the <u>Demolition Expert</u> skill on certain ships, especially those with a high rate of fire and a low individual fire chance per shell (such as ''[[Atlanta]]'', ''[[Gearing]]'', or ''[[Akizuki]]'').  
[[File:Fire_chance_UI.png|right|thumb|180px|A shell's base fire chance can be found by hovering the mouse over the Main Battery information in the Port screen.]]

== Fire Damage ==

Damage dealt by each instance of fire on a ship is fixed as 0.3% of its total health pool per fire per second (1% for aircraft carriers and submarines).  Each fire has a base duration of '''60 seconds''' for battleships, '''30 seconds''' for cruisers, destroyers and submarines, and '''5 seconds''' for aircraft carriers.  A fire that is allowed to burn for the full duration will consume '''18%''' (0.3% x 60 sec.) of a battleship's maximum health, '''9%''' of a cruiser's or destroyer's maximum health, '''5%''' (1% x 5 sec.) of a carrier's, and '''30%''' (1% x 30 sec.) of a submarine's maximum health.

There are exceptions to the above fire duration for cruisers, the cruisers: Tier VI ''[[Admiral Graf Spee]]'' and ''[[HSF Admiral Graf Spee]]'' have a base fire duration of '''45 seconds'''; Large Cruisers<ref name="large">This group includes {{LargeCruiserList}}.</ref> have a base fire duration of '''60 seconds'''.  Maximum fire damage is thus '''13.5%''' (0.3% x 45 sec.) for the German Tier VI, and '''18%''' (0.3% x 60 sec.) for the Tier VII, VIII, IX and X Large Cruisers.

Captains of battleships and large cruisers can quickly see, then, that while one fire might be considered a nuisance, two or more are a major threat to the ship.

== Other Effects of Fire ==

Ships on fire have their surface and aerial detection ranges increased by 2.0 km.  This is particularly noteworthy for destroyer captains.

{{#block:i|Fire does '''not''' increase the detectability of submarines.}}

== Extinguishing Fires ==

Fires can only be extinguished by utilization of the {{Damage Control Party}} consumable, or by waiting for the fire duration timer to expire.  The duration of a fire can be reduced in several ways:

* Equipping {{Damage Control System Modification 2}} will reduce the duration by 15%.
* Using a commander with the Level 3 commander skill [[Ship:Commander#Basics of Survivability|Basics of Survivability]] will reduce the duration by 15%.
* Flying the India Yankee ({{India Yankee|Size=18px}}) [[Ship:Flags#Signals|signal]] will reduce the duration by 20%.

Each of these effects stacks with the others; however, '''they are multiplicative rather than additive'''.

{{#block:!|  For example, if all three reduction effects are stacked, the duration of a single fire on a battleship or large cruiser is: '''60 seconds x 0.85 x 0.85 x 0.80 = 34.68 seconds'''.}}

The below tables provide the fire durations and total health loss for the different combinations of the above three effects.

{|class = "wikitable" style="text-align:center; margin:auto;"
|+ Fire Impacts to Aircraft Carriers
! style="vertical-align:middle; width:300px" | Modifiers
! style="vertical-align:middle; width:175px" | Total Damage
! style="vertical-align:middle; width:175px" | Duration
|-
| Total damage 
| 5.0% of base health 
| 5 seconds
|}


{|class = "wikitable" style="text-align:center; margin:auto;"
|+ Fire Impacts to Battleships and Large Cruisers<ref name="large">This group includes {{LargeCruiserList}}.</ref>
! style="vertical-align:middle; width:300px" | Modifiers
! style="vertical-align:middle; width:175px" | Total Damage
! style="vertical-align:middle; width:175px" | Duration
|-
| Total damage 
| 18% of base health 
| 60 seconds
|-
| With one -15% modifier 
| 15.3% of base health 
| 51 seconds
|-
| With a -20% modifier 
| 14.4% of base health 
| 48 seconds
|-
| With two -15% modifiers 
| 13% of base health 
| 43 seconds
|-
| With one -15% modifier and a -20% modifier 
| 12.2% of base health 
| 41 seconds
|-
| With two -15% modifiers and a -20% modifier 
| 10.4% of base health 
| 35 seconds
|}


{|class = "wikitable" style="text-align:center; margin:auto;"
|+ Fire Impacts to ''[[Admiral Graf Spee]]''
! style="vertical-align:middle; width:300px" | Modifiers
! style="vertical-align:middle; width:175px" | Total Damage
! style="vertical-align:middle; width:175px" | Duration
|-
| Total damage 
| 13.5% of base health 
| 45 seconds
|-
| With one -15% modifier 
| 11.5% of base health 
| 38 seconds
|-
| With a -20% modifier 
| 10.8% of base health 
| 36 seconds
|-
| With two -15% modifiers 
| 9.8% of base health 
| 33 seconds
|-
| With one -15% modifier and a -20% modifier 
| 9.2% of base health 
| 31 seconds
|-
| With two -15% modifiers and a -20% modifier 
| 7.8% of base health 
| 26 seconds
|}


{|class = "wikitable" style="text-align:center; margin:auto;"
|+ Fire Impacts to Destroyers and Cruisers
! style="vertical-align:middle; width:300px" | Modifiers
! style="vertical-align:middle; width:175px" | Total Damage
! style="vertical-align:middle; width:175px" | Duration
|-
| Total damage 
| 9% of base health 
| 30 seconds
|-
| With one -15% modifier 
| 7.7% of base health 
| 26 seconds
|-
| With a -20% modifier 
| 7.2% of base health 
| 24 seconds
|-
| With two -15% modifiers 
| 6.5% of base health 
| 22 seconds
|-
| With one -15% modifier and a -20% modifier 
| 6.1% of base health 
| 20 seconds
|-
| With two -15% modifiers and a -20% modifier 
| 5.2% of base health 
| 17 seconds
|}


{|class = "wikitable" style="text-align:center; margin:auto;"
|+ Fire Impacts to Submarines
! style="vertical-align:middle; width:300px" | Modifiers
! style="vertical-align:middle; width:175px" | Total Damage
! style="vertical-align:middle; width:175px" | Duration
|-
| Total damage 
| 30% of base health
| 30 seconds
|-
| With one -15% modifier 
| 25.5% of base health 
| 25.5 seconds
|-
| With a -20% modifier 
| 24% of base health 
| 24 seconds
|-
| With one -15% modifier and a -20% modifier 
| 20.4% of base health 
| 20.4 seconds
|}


All damage sustained by fires is 100% eligible for recovery by ships that can use the {{Repair Party}} consumable. Note that a standard Repair Party heals up to 14% of a ship's base health (16.8% with the India Delta ({{India Delta|Size=18px}}) signal) over 28 seconds, comparable to a single fire on a battleship depending on other modifiers.

== Notes ==
[https://forum.worldofwarships.com/topic/73349-how-to-quantify-the-effect-of-fire-chance-modification/ How to quantify the effect of fire chance modification] by Special_Kay.

<references />


[[Category:World of Warships]]
[[Category:Rules pages]]