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Combat/Overweight Penalty and Fit Gun Bonus

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Revision as of 19:36, 5 November 2022 by Jigaraphale (talk | contribs) (→‎Battleships (F/BB/V) Bonuses)
Hidden fit bonus mechanics are still being investigated to this day, hence the values are not final and may be subject to changes.
Values with a question mark are lacking enough data and so may be outdated and/or erroneous. Empty cases are unmapped yet.
The developers have also adjusted hidden fits multiple times.


The "hidden fit bonus" mechanic refers to some ships receiving bonuses or penalties when equipping certain equipment, depending on if the equipment "fits" the class or not.

  • This almost exclusively refers to main guns, where each class of ship is engineered to carry up to certain gun calibers, and so, equipping gun turrets of the right caliber or lower will imply an accuracy bonus, whereas using larger calibers will result in some overweight penalties.
  • So far, all fits involve Accuracy Accuracy, and some also affect Firepower Firepower.
  • Not to be confused with visible Equipment Bonuses.

As hidden bonuses are unaffected by morale or fleet types (e.g. combined fleets), it can be interesting to utilize those fit bonuses as much as possible.

How much bonus/penalty a ship receives, depends on:

  • The ship class, larger classes being able to carry larger equipment,
  • If the ship is married or not, married girls having better fits,
  • The gun size (caliber and quantity per turret), the larger ones being the most constraining.
  • Some other less frequent factors:
    • The ship's remodel,
    • The ship's speed,
    • Whether it is a day or night battle.

Battleships (FBB/BB/BBV) Bonuses

Battleships receive accuracy   bonuses if the guns are fit and penalties if it is overweight[1].

Ship Class IJN 35.6cm 
 
 

KMS 38cm 
 
Sov 30.5cm 
 
RN 38.1cm 
 

Fr 38cm 
  		RM 381mm 
  		IJN 41cm USN 16inch Twin USN 16inch Triple RN 16inch IJN 46cm 51cm Twin 
  		51cm Triple 
basic 
 
  		Triple K2  Twin K2  Mk.I  Mk.V  Mk.VIII  Mk.6
mod.2  		Mk.7  Mk.7
+GFCS  		Mk.I  +AFCT  Kai
+FCR  		Proto  46cm  Kai 
Gangut-class +7
Sov 30.5cm: +10 		0 +1 -7 ?? -5 ?? -3 -7 ?? ?? -7 -18 ?? N/A
Kongou-class +7 0 -2 -5 -5? -5 -6~7? -5 -6 -3 -7 -10 -10?
Bismarck-class
Vittorio Veneto-class 		+4 0? +1 -5 -5 -4? -5 ?? ?? -7 -10 ??
Iowa-class +4? 0? -2? -5 0 +2 -7 -10 ??
Colorado-class +1 +2 -2 ?? ?? -6~7
South Dakota-class -5
M: +4.6 		?? ?? ??
Richelieu-class +4 +4~5 -2 -2 -5 -7 -14? -8 -7 -10 ??
Queen Elizabeth-class +6
RN 38.1cm: +8 		+1~2 +2 -2? +5 ?? +3~4 -8 -11 ??
Nelson-class 0 0 +3? 0 0 ?? -2~+1 ??
Fusou-class Kai/Ni
Ise-class Kai 		+4 0 +2 +2 0 0? -3 -7
F+: -11? 		-4?
Ise-class Kai Ni +4? 0 +1? +4? +4? +6 +1~2 +2 ?? -7
F+: -11? 		??
Fusou-class base
Ise-class base 		+2 0 +2 +2 +2 +2? +3 +3 -3 -7 ??
Nagato-class base/Kai 0 ??
Nagato-class Kai Ni +2? 0 +1? +5 +5 +6 Mutsu: +2~3 ?? ?? 0 +4 -2? -4? -6? Nagato: -5
Mutsu: -8 		??
Yamato-class 0 +3 +3 +7 0 ??
Yamato Kai Ni [2] (FBB) ? [3] ?? -7 ?? ?? -10
  • The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
  • For married ships, the overweight penalty is generally reduced by 40%:
    • E.g. a married Kongou with a 46cm receives -6 instead of -10,
    • Some exceptions will receive a bonus instead of a penalty on certain guns after marriage.
  • If more than one gun of the same class is used, multiply the modifier by the square root of the number of guns:
    • E.g. a Kongou with two IJN 35.6cm equipped receives √2 x 7 = 9.89.
  • If guns from different classes are used together, add the modifiers together.
    • E.g. a Kongou with 35.6cm and 41cm mixed receives 7 - 5 = 2.
    • Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut, with what happens when combining 30.5cm and 35.6cm is still under investigation.

More generally, the accuracy offset can be defined with the formula:

[math]\displaystyle{ W = \sum^{\text{All Classes}} \left ( C_{k} M_{k} \sqrt{N_{k}} \right ) \% }[/math]

With:

  • [math]\displaystyle{ W }[/math] the resulting fit bonus or overweight penalty
  • [math]\displaystyle{ C_{k} }[/math] the main coefficient of the equipped gun class. Refer to the above table for the coefficients applied to each Battleship for their respective guns.
  • [math]\displaystyle{ M_{k} }[/math] the marriage coefficient for the particular gun class. Assumes a value of 0.6 if the ship is married, and if the main coefficient is negative.
  • [math]\displaystyle{ N_{k} }[/math] the number of equipped guns for that gun class.
  1. ↑ https://twitter.com/KanColle_STAFF/status/493648336142876674
  2. ↑ https://twitter.com/rook2605272/status/1554786971851313154?s=20&t=_aDpy12GV5PFTSbe6bmMYg
  3. ↑ Those fits seem equal to regular IJN battleships ones.

Sources: [1] [2]

Native Guns

Since gun overweight penalty and fit bonuses are not yet all measured for some guns and ships, here is a list of the guns natively used/planned to be used in real life by each ship class.

  • The "Twin/Triple" mount distinction is made for convenience, triple guns being heavier than their twin counterpart.
  • Equipping ships with those guns may not always be optimal, but this should avoid most overweight penalties.
 Large Guns
Nation Class Caliber Twin Triple
Japanese Kongou-class
Fusou-class
Ise-class 		35.6cm
 
35.6cm Twin Gun Mount
 
35.6cm Twin Gun Mount (Dazzle Camouflage)
 
35.6cm Twin Gun Mount Kai
 
35.6cm Twin Gun Mount Kai Ni
 
Prototype 35.6cm Triple Gun Mount
 
35.6cm Triple Gun Mount Kai (Dazzle Camouflage)
Fusou-class Kai Ni
Ise-class Kai Ni
Nagato-class 		41cm
 
41cm Twin Gun Mount
 
41cm Twin Gun Mount Kai Ni
 
Prototype 41cm Triple Gun Mount
 
41cm Triple Gun Mount Kai
 
41cm Triple Gun Mount Kai Ni
Yamato-class 46cm
 
Prototype 46cm Twin Gun Mount
 
46cm Triple Gun Mount
 
46cm Triple Gun Mount Kai
Yamato-class Kai Ni 51cm
 
Prototype 51cm Twin Gun Mount
 
51cm Twin Gun Mount
 
Prototype 51cm Triple Gun Mount
US Colorado-class 40,64cm
 
16inch Mk.I Twin Gun Mount
 
16inch Mk.V Twin Gun Mount
 
16inch Mk.VIII Twin Gun Mount Kai
North Carolina-class
South Dakota-class
 
16inch Triple Gun Mount Mk.6
 
16inch Triple Gun Mount Mk.6 + GFCS
 
16inch Triple Gun Mount Mk.6 mod.2
Iowa-class
 
16inch Triple Gun Mount Mk.7
 
16inch Triple Gun Mount Mk.7 + GFCS
British Queen Elizabeth-class 38.1cm
 
38.1cm Mk.I Twin Gun Mount
 
38.1cm Mk.I/N Twin Gun Mount Kai
Nelson-class 40,64cm
 
16inch Mk.I Triple Gun Mount
 
16inch Mk.I Triple Gun Mount + AFCT Kai
 
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
Italian Conte di Cavour-class 30.5cm
 
305mm/46 Twin Gun Mount
 
305mm/46 Triple Gun Mount
32cm
 
320mm/44 Twin Gun Mount
 
320mm/44 Triple Gun Mount
Vittorio Veneto-class 38.1cm
 
381mm/50 Triple Gun Mount
 
381mm/50 Triple Gun Mount Kai
German Bismarck-class 38cm
 
38cm Twin Gun Mount
 
38cm Twin Gun Mount Kai
French Richelieu-class 38cm
 
38cm Quadruple Gun Mount
 
38cm Quadruple Gun Mount Kai
 
38cm Quadruple Gun Mount Kai Deux

'"Double Twin Guns" in a Quadruple Mount.
Russian Gangut-class 30.5cm
 
30.5cm Triple Gun Mount
 
30.5cm Triple Gun Mount Kai

Cruiser Bonuses

    Medium Guns
Gun Groups Guns
A 14cm Single  · 14cm Twin  · 14cm Twin Kai 
B 15.2cm Twin  · 15.2cm Twin Kai  · 15.2cm Twin Kai Ni 

Bofors 15.2cm Twin Mod 1930  · Bofors 15cm Twin Mk9 Mod 1938  · Bofors 15cm Twin Mk9 Kai + Single Mk10 Kai Mod 1938 

6" Twin MkXXI 

C 15.5cm Triple  · 15.5cm Triple Kai 
D 6" Triple Mk16  · 6" Triple Mk16 mod2 

6" Triple MkXXIII 

152mm/55 Triple  · 152mm/55 Triple Kai 

E 5" Twin CD  · GFCS + 5" Twin CD 
F 20.3cm Twin  · 20.3cm N°2 Twin  · 20.3cm N°3 Twin 

SKC34 20.3cm Twin  · 203mm/53 Twin 

G 8" Triple Mk9  · 8" Triple Mk9 mod2 

Notes:

  • Future Medium Guns may fall in one of those categories based on similarities like caliber and number of guns.

Light Cruisers (CL/CLT/CT)

Accuracy   bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).

Ships Guns group[1] Accuracy bonus/penalty
1st Gun 2nd Gun Unmarried Married
Default to
every CL(T)/CT 		- - 0 0
A/B A/B 0 2
C C -5? -1?
D D -6 -3.6
E E
F F
F - -3 -1.8
G G -22 -17.6
Agano-class B - 5 7
B B 6 8
F F -8 -6
Ooyodo C C -2 -1.2
F F -10 -8
Atlanta-class E E 0 3
Abyssals - - 0[2] -
Any Medium Gun - -3[3] -
  • There is not enough data to pin down the exact fit accuracy formula.
  • Other gun combinations fits cannot be extrapolated yet.
  • There are known tests where the fit bonuses do not scale linearly with the number of guns.
  1. ↑ Changing gun order does not affect the final bonus
  2. ↑ Light Cruiser Tsu-Class
  3. ↑ Light Cruiser Ho-Class, Light Cruiser He-Class, Light Cruiser To-Class, Torpedo Cruiser Chi-Class
Ships 15.2cm Single Secondary 
CL(T)/CT +4N

Firepower   bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).

Ships 14cm Single 
15.2cm Single Secondary  		14cm Twin /Kai 
  · 15.2cm /Kai 
 

Bofors 15.2cm  · 6" Twin MkXXI 

CL(T)/CT +1 +2

Sources: [3] [4]

Heavy Cruisers (CA/CAV)

CA(V) as well as other "Medium Guns capable ships" are still under investigation, this information is outdated and may be erroneous.

Accuracy   bonuses for Heavy Cruisers (CA), Aviation Cruisers (CAV), as well as some other "Medium Guns capable ships" like Seaplane Tenders (AV), Kamoi (AO forms).

  • Other ships like Submarine Tenders (AS) are unmapped yet.
Ships 14cm Twin /Kai 
  		15.2cm /Kai 
  		C IJN 20.3cm 
 
  		203mm/53  G
Day Night
CA(V) 0 +5 +5N? 0
Mogami-class +2
Mogami-class Kai Ni +5
Zara-class +1
AV/Kamoi (AO) -6N -6N -8 -10N -8 -10N?
  • The table shows an estimated accuracy and/or firepower fit bonus based on having one fit gun equipped.
    • The variable N refers to the number of guns of that category equipped
    • E.g. 2 guns of 2N = 4 Acc
  • Bonuses from guns of different classes are simply added together.
  • The night fit bonus from the IJN 20.3cm series used to be capped at +15%. However, it is unknown whether this cap has been removed or not from the recent updates.
    • It is possible that certain fit categories only work during the day, but there is no concrete data proving it yet.
    • It is alternatively possible that the night bonus from the IJN 20.3cm series overrides any other categories.
    • Such fit mechanics do not apply to abyssals.[1]
  • As of 13th December 2018 the hidden firepower bonus of 14cm Twin Gun Mount Kai  does not work/does not exist[citation needed].


Firepower   bonuses for Heavy Cruisers (CA), Aviation Cruisers (CAV), as well as some other "Medium Guns capable ships" like Seaplane Tenders (AV), Kamoi (AO forms).

  • Other ships like Submarine Tenders (AS) are unmapped yet.
Ships 203mm/53 
Zara-class +1
  1. ↑ https://twitter.com/KanColle_STAFF/status/380246238991364096

Sources: [5] [6]

12.7cm HA Late Models

As of 2017/06/23, Yura Kai Ni, Mutsuki-classes, and Kamikaze-classes gain accuracy   bonuses with some main Late Models High Angle 12.7cm guns  .

Ship 12.7cm Single HA Mount (LM)  12.7cm Twin HA Mount (LM) 
CL(T)/CT +4N +2 +2N
Yura Kai Ni  +4 +10N
Mutsuki-class +5
Kamikaze-class ??

Notes:

  • Only Yura Kai Ni  and Satsuki Kai Ni  were tested. It is unknown whether the other ships listed also receive those bonuses, or whether it only works for specific remodels.
  • The variable N refers to the number of guns of that category equipped (ex: 2 guns of 2N = 4).
  • It is unknown whether the 12.7cm Single HA  gives any bonus.

Sources: [7]

Destroyer (DD) Bonuses

Certain destroyers receive some Accuracy   bonuses when equipped with certain guns or sonars.

  • The bonus accuracy likely takes the form: [math]\displaystyle{ \text{ACCURACY}_\text{bonus} = \text{C} \times \sqrt{\text{N}} }[/math]
    • N being the amount of equipment.
Known "C" values
Ships Gear C
Tashkent/Verniy 
  		 130mm B-13 Twin Gun Mount  5
Fletcher-class 
  		 5" Single Gun Mk.30 variants 
 
  		4[1]
John C. Butler-class  4[2]
J-class 
  		 QF 4.7inch Gun Mk.XII Kai  3
 ASDICs 
 
  		3 [3]
Mutsuki-class  12cm Single Gun Mount Kai 2  5
  1. ↑ 2x base 5" Gun  on Fletcher-class gives ~10 accuracy. This is potentially a bug.
  2. ↑ Samuel B.Roberts does not seem to receive any bonus from base 5" Gun . This is possibly a bug (maybe related to the bug on Fletcher-class).
  3. ↑ There are not enough samples on more than one ASDICs 
     
          sonar so it is not clear how does the accuracy bonus scales. This bonus can stack with the accuracy bonus from QF 4.7inch Gun Mk.XII Kai .

Sources: [8] [9]

Arctic Map bonuses

On all "arctic maps", namely all World 3 maps, as well a some Event maps, the   Arctic Camouflage (+ Arctic Equipment)  gives:

  • 3 Armor  ,
  • Some Evasion  .

Sources: [10] [11]

See Also

Main data sources:


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