User:Ninnin/Sandbox/1
Submarines (SS, also including "Aircraft Carrying Submarines" SSV) are characterized by relatively low armor and HP. BY contrast, they are difficult to handle using normal "anti-ship" setups, requiring instead specific Anti-Submarine Warfare (ASW) equipment and setups in order to be sunked. Submarine are typically found at pre-boss nodes.
Anti-Submarine Warfare
Attack Behavior
- They cannot be targeted by normal shelling attack
- Submarine are immune to air and torpedo attack.
- Submarines cannot take more than scratch damage at night and therefore cannot be sunk.
- The exception to this rule is when a battle starts at night, or when in a combined fleet
- ASW attacks is the only to have a damage modifier above 1 with some formation(Diamond, Echelon, Line-Abreast)
| Ship type | Specific ship | Condition | Day Battle | Night Battle |
|---|---|---|---|---|
| All | All[1] | at least 1 base  ASW
|
prioritize SS | |
| AV CAV BBV LHA | All |  Bomber   +1 
|
Prioritize SS | Don't attack SS |
| CVL+Kaga Kai Ni Go | All[2] | no more than moderately damaged (中破) have an attack aircraft with +1 [3]
|
Prioritize SS | Nigth Air Attack cannot target SS |
Mogami-class Kou Kai Ni 
|
Prioritize surface target | |||
Taiyou-class Kai Ni   Kaga Kai Ni Go 
|
Prioritize SS | Nigth Air Attack will prioritize surface target[4] Nigth Shelling prioritize SS | ||
| Gambier Bay Mk.II | Prioritize SS | Prioritize SS with night air attack | ||
- ↑ include Hayasui and Yamashio Maru with no
equiped
- ↑ include Hayasui Kai and Yamashio Maru Kai with equiped
- ↑ a 0 attack plane paired with a rotorcraft or a patrol plane
do work
- ↑ In abscnece of surface target will do a night shelling against SS
Damage calculation
[math]\displaystyle{ \text{ASW Power} = \left( 2\sqrt{\text{ASW}_\text{ship}} + 1.5\text{ASW}_\text{equip} + \bigstar + \text{Type}_\text{ship} \right) \times \text{Mod}_\text{synergy} }[/math]
- [math]\displaystyle{ \text{Type}_\text{ship} }[/math] is a constant depending on the type of the ship performing the attack. See below for details.
| Ship Type Constant | |
|---|---|
| Constant | Ship Types |
| 13 | Coastal Defence Ships (DE) Destroyers (DD) Light Cruisers (CL/CT) Oilers (AO) (without aircraft equipped) |
| 8 | Aviation Cruisers (CAV) Aviation Battleships (BBV) Seaplane Tenders (AV) Light Carriers (CVL) Landing Ships (LHA) Oilers (AO) (with aircraft equipped) |
- [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] is the synergy multiplier bonus from using certain combinations of ASW equips. See below for details.
| ASW Damage Synergy | |||
|---|---|---|---|
 Small Small Sonars
|
 Type 93 Passive Sonar  Type 4 Passive Sonar  Type 3 Active Sonar  Type 3 Active Sonar Kai  Type124 ASDIC  Type144/147 ASDIC  HF/DF + Type144/147 ASDIC | ||
| Large Large Sonars
|
 Type 0 Passive Sonar | ||
 DCP Depth Charge Projectors (DCP)
|
 Type 94 Depth Charge Projector  Type 3 Depth Charge Projector  Type 3 Depth Charge Projector (Concentrated Deployment)  Prototype 15cm 9-tube ASW Rocket Launcher  RUR-4A Weapon Alpha Kai  Mk.32 ASW Torpedo (Mk.2 Thrower) | ||
| DCR Depth Charge (Racks) (DCR)
|
 Type 95 Depth Charge  Type 2 Depth Charge  Lightweight ASW Torpedo (Initial Test Model)  Hedgehog (Initial Model)  Type 2 Depth Charge Kai Ni | ||
| Other ASW Mortars
|
 Type 2 12cm Mortar Kai  Type 2 12cm Mortar Kai (Concentrated Deployment) | ||
| ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math] | |||
| [math]\displaystyle{ {Mod}_\text{1} }[/math] | + (Any Sonar + Any Depth Charge) |
1.15 | |
| [math]\displaystyle{ {Mod}_\text{2} }[/math] | DCP + DCR and NO Small
|
1.1 | |
| Small + DCP + DCR
|
1.25 | ||
| Examples | |||
| [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] | Small + DCP + DCR
|
1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math] | |
| Large + DCP + DCR
|
1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math] | ||
| Armor Penetration | |||
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks.
The flat armor penetration value is calculated as follows:
| |||
- The bonuses do not stack, meaning only the highest possible bonus applies.
- The exception is when using the special depth charge projectors detailed above.
- Multiple equipments of the same type still only apply the bonus once.
- There is an accuracy bonus as well but it is small. Stacking sonars will give a bigger accuracy bonus.
- Notes
- When contributing to ASW power, Base ASW is square rooted, while equipment ASW is multiplied by 1.5
- ASW equipment is therefore the primary source of ASW damage, with base ASW playing a very minor role.
- However, base ASW is the primary determinant of whether a ship can reach 100 total ASW to perform opening ASW attacks.
LBAS
See the Land-Based Air Squadron page
- Only ASW Planes (7+ ASW) can attack submarine during this phase.
- If submarines are present, those planes will prioritize attacking submarines, while other attackers will only be able to attack surface targets.
Opening ASW Shelling (OASW)
Commonly referred to as OASW (opening ASW). All eligible ships will perform a regular ASW Shelling attack, following range order in the same fashion as the First Shelling Phase. As these opening attacks happen before the Opening Torpedo Salvo, they may disable or even sink enemy submarines before they have a chance to attack.
OASW has the following trigger conditions:
- Only ships listed below can trigger an OASW,
- The ship is not required to be able to perform any ASW Shelling.
- They must meet their specific ASW stat threshold and requirements, listed below,
| OASW Ship | ASW Stat Required[1] | Equipment Required[2][3][4] |
|---|---|---|
| Any DD, CL, CLT, CT, AO[5] | 100+ ASW | 1 Sonar Equipped
|
 Kai Ni Juu 
|
+ Bomber / / /  Sonar + Any Seaplane Bomber, or Rotorcraft, or Liaison Aircraft, or Dive Bomber, with 1+ ASW | |
 
|
+ Bomber / / Sonar + Seaplane Bomber, or Rotorcraft, or Depth Charge | |
| Any CVL[6] | + /  / / Sonar + Any with 1+ ASW | |
| 50+ ASW | + / / Sonar + Any with 7+ ASW | |
| 65+ ASW | / / Any with 7+ ASW | |
| Any DE | 60+ ASW | 1 Sonar Equipped
|
| 75+ ASW | Total of 4+ ASW from equipment | |
  Kai Ni D Fletcher-class[7] John C. Butler-class Kai/Mk.II J-class Kai |
Can OASW innately | |
    Kai Ni Go
|
N/A | / / / Any with 1+ ASW |
|
N/A | 2 Autogyros   -or- 1 Helicopter 
|
- ↑ The Required ASW Stat does include Visible Bonuses, but does not include Improvements.
- ↑ Visible Bonuses or Improvements do not count as equipment ASW (e.g. a +6 ASW equipment with +1 ASW bonus does not count as a +7 equipment but just as a +6 one).
- ↑ When applicable, if all relevant ASW aircraft are in zero plane slots, and no bomber / with 1+ are present in non-zero plane slot, the ship cannot OASW.
- ↑ Regardless of their ASW stat,
Fighters or 
Carrier Recons cannot trigger any OASW.
- ↑ Other ASW Shelling capable ships may be able to OASW, but cannot reach 100 ASW using currently available equipment.
- ↑ CVE should be used, as they are the only CVL with base ASW stat.
- ↑ Kai only for Heywood L. Edwards.
See the list of Anti-submarine Weaponry and ASW Aircraft to better see what can help achieve OASW on a given ship.
Abyssals
Abyssal ships do not follow these rules. The following may perform OASW unconditionally:
- Destroyer Ha-Class Late Model Elite
- Destroyer Ni-Class Late Model Elite
- Light Cruiser Tsu-Class Flagship
- Light Carrier Nu-Class (Elite III, Elite IV, all Kai Elite, all Kai Flagship)
- Ancient Destroyer Princess II
- Seaplane Tender Water Princess (all variants)
- Abyssal Kuriles Princess (all variants)
- Destroyer Forest Princess (Damaged variants unconfirmed)
Other abyssals cannot perform OASW.
ASW Support Expedition
- If a CVL is present, aircraft with ASW will attack submarines regardless of the ship on which it's equipped.