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** It is alternatively possible that the night bonus from the '''IJN 20.3cm''' series overrides any other categories.
 
** 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 [[abyssal]]s.<ref>https://twitter.com/KanColle_STAFF/status/380246238991364096</ref>
 
** Such fit mechanics do not apply to [[abyssal]]s.<ref>https://twitter.com/KanColle_STAFF/status/380246238991364096</ref>
 +
 +
*As of 13th December 2018 the hidden firepower bonus of {{Equipment/Link|14cm Twin Gun Mount Kai}} does not work/does not exist{{cite}}.
  
  
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|}
 
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<references/>
 
'''''Sources: [https://twitter.com/yukicacoon/status/1301508712780111872] [https://docs.google.com/spreadsheets/d/11-nekeN0IBLtzdxxIzV0Gm3T7U4BpCrYA1lGsQYAEJo/edit#gid=1787693456]'''''
 
'''''Sources: [https://twitter.com/yukicacoon/status/1301508712780111872] [https://docs.google.com/spreadsheets/d/11-nekeN0IBLtzdxxIzV0Gm3T7U4BpCrYA1lGsQYAEJo/edit#gid=1787693456]'''''
  

Revision as of 13:06, 20 August 2022


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 (F)BB(V) Bonuses

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

Ship Class IJN 35.6 cm35.6cm Twin Gun Mount
35.6cm Twin Gun Mount (Dazzle Camouflage)
Prototype 35.6cm Triple Gun Mount

KMS 38 cm38cm Twin Gun Mount
38cm Twin Gun Mount Kai

Sov 30.5 cm30.5cm Triple Gun Mount
30.5cm Triple Gun Mount Kai

RN 38.1 cm38.1cm Mk.I Twin Gun Mount
38.1cm Mk.I/N Twin Gun Mount Kai

Fr 38 cm38cm Quadruple Gun Mount
38cm Quadruple Gun Mount Kai
RM 381 mm381mm/50 Triple Gun Mount
381mm/50 Triple Gun Mount Kai
IJN 41 cm USN 16 in Twin USN 16 in Triple RN 16 in IJN 46 cm 51 cm TwinPrototype 51cm Twin Gun Mount
51cm Twin Gun Mount
51 cm TriplePrototype 51cm Triple Gun Mount
basic41cm Twin Gun Mount
Prototype 41cm Triple Gun Mount
41cm Triple Gun Mount Kai
Triple K241cm Triple Gun Mount Kai Ni Twin K241cm Twin Gun Mount Kai Ni Mk.I16inch Mk.I Twin Gun Mount Mk.V16inch Mk.V Twin Gun Mount Mk.VIII16inch Mk.VIII Twin Gun Mount Kai Mk.716inch Triple Gun Mount Mk.7 Mk.7
+GFCS
16inch Triple Gun Mount Mk.7 + GFCS
Mk.6
mod.2
16inch Triple Gun Mount Mk.6 mod.2
Mk.I16inch Mk.I Triple Gun Mount +AFCT16inch Mk.I Triple Gun Mount + AFCT Kai Kai
+FCR
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
ProtoPrototype 46cm Twin Gun Mount 46cm46cm Triple Gun Mount Kai46cm Triple Gun Mount Kai
Gangut-class +7
Sov 30.5 cm: +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 38.1 cm: +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 NiYamato Kai Ni[2] (FBB) 0 ?? -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 46 cm 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 35.6 cm equipped receives √2 x 7 = 9.89.
  • If guns from different classes are used together, add the modifiers together.
    • E.g. a Kongou with 35.6 cm and 41 cm 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 30.5 cm and 35.6 cm 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.

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 Caliber Main GunLarge Guns
Nation Class Caliber Twin Triple
Japanese Kongou-class
Fusou-class
Ise-class
35.6 cm
Equipment Card 35.6cm Twin Gun Mount.png
35.6cm Twin Gun Mount
Equipment Card 35.6cm Twin Gun Mount (Dazzle Camouflage).png
35.6cm Twin Gun Mount (Dazzle Camouflage)
Equipment Card 35.6cm Twin Gun Mount Kai.png
35.6cm Twin Gun Mount Kai
Equipment Card 35.6cm Twin Gun Mount Kai 2.png
35.6cm Twin Gun Mount Kai Ni
Equipment Card Prototype 35.6cm Triple Gun Mount.png
Prototype 35.6cm Triple Gun Mount
Equipment Card 35.6cm Triple Gun Mount Kai (Dazzle Camouflage).png
35.6cm Triple Gun Mount Kai (Dazzle Camouflage)
Fusou-class Kai Ni
Ise-class Kai Ni
Nagato-class
41 cm
Equipment Card 41cm Twin Gun Mount.png
41cm Twin Gun Mount
Equipment Card 41cm Twin Gun Mount Kai 2.png
41cm Twin Gun Mount Kai Ni
Equipment Card Prototype 41cm Triple Gun Mount.png
Prototype 41cm Triple Gun Mount
Equipment Card 41cm Triple Gun Mount Kai.png
41cm Triple Gun Mount Kai
Equipment Card 41cm Triple Gun Mount Kai 2.png
41cm Triple Gun Mount Kai Ni
Yamato-class 46 cm
Equipment Card Prototype 46cm Twin Gun Mount.png
Prototype 46cm Twin Gun Mount
Equipment Card 46cm Triple Gun Mount.png
46cm Triple Gun Mount
Equipment Card 46cm Triple Gun Mount Kai.png
46cm Triple Gun Mount Kai
Yamato-class Kai Ni 51 cm
Equipment Card Prototype 51cm Twin Gun Mount.png
Prototype 51cm Twin Gun Mount
Equipment Card 51cm Twin Gun Mount.png
51cm Twin Gun Mount
Equipment Card Prototype 51cm Triple Gun Mount.png
Prototype 51cm Triple Gun Mount
US Colorado-class 40,64 cm
Equipment Card 16inch Mk.I Twin Gun Mount.png
16inch Mk.I Twin Gun Mount
Equipment Card 16inch Mk.V Twin Gun Mount.png
16inch Mk.V Twin Gun Mount
Equipment Card 16inch Mk.VIII Twin Gun Mount Kai.png
16inch Mk.VIII Twin Gun Mount Kai
North Carolina-class
South Dakota-class
Equipment Card 16inch Triple Gun Mount Mk.6.png
16inch Triple Gun Mount Mk.6
Equipment Card 16inch Triple Gun Mount Mk.6 + GFCS.png
16inch Triple Gun Mount Mk.6 + GFCS
Equipment Card 16inch Triple Gun Mount Mk.6 mod.2.png
16inch Triple Gun Mount Mk.6 mod.2
Iowa-class
Equipment Card 16inch Triple Gun Mount Mk.7.png
16inch Triple Gun Mount Mk.7
Equipment Card 16inch Triple Gun Mount Mk.7 + GFCS.png
16inch Triple Gun Mount Mk.7 + GFCS
British Queen Elizabeth-class 38.1 cm
Equipment Card 38.1cm Mk.I Twin Gun Mount.png
38.1cm Mk.I Twin Gun Mount
Equipment Card 38.1cm Mk.I N Twin Gun Mount Kai.png
38.1cm Mk.I/N Twin Gun Mount Kai
Nelson-class 40,64 cm
Equipment Card 16inch Mk.I Triple Gun Mount.png
16inch Mk.I Triple Gun Mount
Equipment Card 16inch Mk.I Triple Gun Mount + AFCT Kai.png
16inch Mk.I Triple Gun Mount + AFCT Kai
Equipment Card 16inch Mk.I Triple Gun Mount Kai + FCR Type 284.png
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
Italian Conte di Cavour-class 30.5 cm
Equipment Card 305mm 46 Twin Gun Mount.png
305mm/46 Twin Gun Mount
Equipment Card 305mm 46 Triple Gun Mount.png
305mm/46 Triple Gun Mount
32 cm
Equipment Card 320mm 44 Twin Gun Mount.png
320mm/44 Twin Gun Mount
Equipment Card 320mm 44 Triple Gun Mount.png
320mm/44 Triple Gun Mount
Vittorio Veneto-class 38.1 cm
Equipment Card 381mm 50 Triple Gun Mount.png
381mm/50 Triple Gun Mount
Equipment Card 381mm 50 Triple Gun Mount Kai.png
381mm/50 Triple Gun Mount Kai
German Bismarck-class 38 cm
Equipment Card 38cm Twin Gun Mount.png
38cm Twin Gun Mount
Equipment Card 38cm Twin Gun Mount Kai.png
38cm Twin Gun Mount Kai
French Richelieu-class 38 cm
Equipment Card 38cm Quadruple Gun Mount.png
38cm Quadruple Gun Mount
Equipment Card 38cm Quadruple Gun Mount Kai.png
38cm Quadruple Gun Mount Kai
Equipment Card 38cm Quadruple Gun Mount Kai Deux.png
38cm Quadruple Gun Mount Kai Deux

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

Cruiser Bonuses

Medium Caliber Main Gun High-Angle Gun Medium Guns
Gun Groups Guns
A 14 cm Single14cm Single Gun Mount · 14 cm Twin14cm Twin Gun Mount · 14 cm Twin Kai14cm Twin Gun Mount Kai
B 15.2 cm Twin15.2cm Twin Gun Mount · 15.2 cm Twin Kai15.2cm Twin Gun Mount Kai · 15.2 cm Twin Kai Ni15.2cm Twin Gun Mount Kai Ni

Bofors 15.2 cm Twin Mod 1930Bofors 15.2cm Twin Gun Mount Model 1930 · Bofors 15 cm Twin Mk9 Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Model 1938 · Bofors 15 cm Twin Mk9 Kai + Single Mk10 Kai Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Kai + Single Rapid Fire Gun Mount Mk.10 Kai Model 1938

6" Twin MkXXI6inch Twin Rapid Fire Gun Mount Mk.XXI

C 15.5 cm Triple15.5cm Triple Gun Mount · 15.5 cm Triple Kai15.5cm Triple Gun Mount Kai
D 6" Triple Mk166inch Triple Rapid Fire Gun Mount Mk.16 · 6" Triple Mk16 mod26inch Triple Rapid Fire Gun Mount Mk.16 mod.2

6" Triple MkXXIII6inch Mk.XXIII Triple Gun Mount

152 mm/55 Triple152mm/55 Triple Rapid Fire Gun Mount · 152 mm/55 Triple Kai152mm/55 Triple Rapid Fire Gun Mount Kai

E 5" Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) · GFCS + 5" Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
F 20.3 cm Twin20.3cm Twin Gun Mount · 20.3 cm N°2 Twin20.3cm (No.2) Twin Gun Mount · 20.3 cm N°3 Twin20.3cm (No.3) Twin Gun Mount

SKC34 20.3 cm TwinSKC34 20.3cm Twin Gun Mount · 203 mm/53 Twin203mm/53 Twin Gun Mount

G 8" Triple Mk98inch Triple Gun Mount Mk.9 · 8" Triple Mk9 mod28inch Triple Gun Mount Mk.9 mod.2

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 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.


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

Ships 14cm Single14cm Single Gun Mount 14cm Twin /Kai14cm Twin Gun Mount
14cm Twin Gun Mount Kai
 · 15.2 cm /Kai15.2cm Twin Gun Mount
15.2cm Twin Gun Mount Kai

Bofors 15.2 cmBofors 15.2cm Twin Gun Mount Model 1930 · 6" Twin MkXXI6inch Twin Rapid Fire Gun Mount Mk.XXI

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 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 /Kai14cm Twin Gun Mount
14cm Twin Gun Mount Kai
15.2 cm /Kai15.2cm Twin Gun Mount
15.2cm Twin Gun Mount Kai
C IJN 20.3 cm20.3cm Twin Gun Mount
20.3cm (No.2) Twin Gun Mount
20.3cm (No.3) Twin Gun Mount
203mm/53203mm/53 Twin Gun Mount 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 20.3 cm 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 Kai14cm Twin Gun Mount Kai does not work/does not exist[citation needed].


Firepower 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/53203mm/53 Twin Gun Mount
Zara-class +1

Sources: [5] [6]

12.7 cm HA Late Models

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

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

Notes:

  • Only Yura Kai NiYura Kai Ni and Satsuki Kai NiSatsuki 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 12.7 cm Single HA12cm Single High-angle Gun Mount gives any bonus.

Sources: [7]

Destroyer (DD) Bonuses

Certain destroyers receive some Accuracy 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/VerniyTashkent
Verniy
Small Caliber Main Gun130mm B-13 Twin Gun Mount130mm B-13 Twin Gun Mount 5
Fletcher-classFletcher
Johnston
High-Angle Gun5" Single Gun Mk.30 variants5inch Single Gun Mount Mk.30
5inch Single Gun Mount Mk.30 Kai
5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37
4[1]
John C. Butler-classSamuel B. Roberts 4[2]
J-classJervis
Janus
Small Caliber Main GunQF 4.7inch Gun Mk.XII KaiQF 4.7inch Gun Mk.XII Kai 3
SONARASDICsType124 ASDIC
Type144/147 ASDIC
HF/DF + Type144/147 ASDIC
3 [3]
Mutsuki-class Small Caliber Main Gun12cm Single Gun Mount Kai 212cm Single Gun Mount Kai 2 5
  1. 2x base 5" Gun5inch Single Gun Mount Mk.30 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" Gun5inch Single Gun Mount Mk.30. This is possibly a bug (maybe related to the bug on Fletcher-class).
  3. There are not enough samples on more than one ASDICsType124 ASDIC
    Type144/147 ASDIC
    HF/DF + Type144/147 ASDIC
    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 KaiQF 4.7inch Gun Mk.XII Kai.

Sources: [8] [9]

See Also

Main data sources :