Partials/Speed system

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See full page: Improving Ship Speed


A ship is either slow or fast natively, the speed can be increased (from slow to fast to fast+ to fastest) using engine synergies, by equipping a turbineImproved Kanhon Type Turbine (can be equipped in the Reinforcement ExpansionReinforcement Expansion) and one or more boilers (Enhanced Kanhon Type BoilerEnhanced Kanhon Type Boiler and New Model High Temperature High Pressure BoilerNew Model High Temperature High Pressure Boiler) on a ship.

  • As some branching rules are affected by speed, speeding up a fleet can make it follow a different routing.
    • Note, however, that this does not change ship types, initially slow BB and BBV can have fast speed, but still are not FBB.
  • BB/BBV that are fast+ can be placed in the escort fleet of STF/TCF (only fast for Warspite Kai).
Speed Groups
Base Speed Speed Group Type Exceptions
Fast A CAV
B1 N/A
B2 FBB, CV, CVB, CA, CL, CLT, DD
C AV
Slow A N/A
B BB, BBV, CVL, CT, AS, AO, LHA
C SS, SSV, AR
None DE N/A
Speed exceptions
Ships Speed group Exception Notes
All Fast A +1 Speed Fit Bonus with the +13 BoilerNew Model High Temperature High Pressure Boiler at 7+ Improved Stackable
All Slow A +1 Speed Fit Bonus with the +13 BoilerNew Model High Temperature High Pressure Boiler at 7+ Improved & a TurbineImproved Kanhon Type Turbine
Houshou Kai Ni/SenHoushou Kai Ni
Houshou Kai Ni Sen
Slow A +1 Speed Fit Bonus with the +13 BoilerNew Model High Temperature High Pressure Boiler Not self-stackable
Stackable with above only for +13 BoilerNew Model High Temperature High Pressure Boiler at 6- Improved
Inagi Kai NiInagi Kai Ni Slow B Not self-stackable and speed caped to fast +
Sentaka Type Slow C Not self-stackable
Yuubari Kai Ni TokuYuubari Kai Ni Toku

Samuel B. Roberts/KaiSamuel B. Roberts
Samuel B. Roberts Kai

Slow B Speed set to Fast when equipping a TurbineImproved Kanhon Type Turbine Not self-stackable

Bonus disabled if equipping any "other" variants of Engine Improvement Engine Improvements.

  • Regular speed modding behaviors then.
Amatsukaze Kai/NiAmatsukaze Kai
Amatsukaze Kai Ni

Shimakaze KaiShimakaze Kai

Fast A/B1 Can equip Engine Improvement BoilersEnhanced Kanhon Type Boiler
New Model High Temperature High Pressure Boiler
in the RE
Simplified Engine Synergies
Speed
Speed Increments
Boiler Type Boilers Required
Fast A

Fast B1
Slow A
Fast B2
Slow B
Fast C
Slow C
+1 Any boiler 1
+2 +13New Model High Temperature High Pressure Boiler boilers 1 2 2 N/A
+13New Model High Temperature High Pressure Boiler boiler
+ +10Enhanced Kanhon Type Boiler boiler
= Total
0+
0+
2
1+
0+
2
0+
0+
3
+3
(Slow A only)
+13New Model High Temperature High Pressure Boiler boiler
+ +10Enhanced Kanhon Type Boiler boiler
= Total
N/A 1+
0+
3
N/A
Engine Synergies
Engine Improvement Engine Improvements Speed groups
Fast Slow
A B1 B2 C A B C
Main Slots
Required
TurbineImproved Kanhon Type Turbine +10 BoilerEnhanced Kanhon Type Boiler +13 BoilerNew Model High Temperature High Pressure Boiler +13 BoilerNew Model High Temperature High Pressure Boiler
7+Improved
Houshou K2/SenHoushou Kai Ni
Houshou Kai Ni Sen
A Inagi K2Inagi Kai Ni Yuub K2TYuubari Kai Ni Toku
SamyB/KSamuel B. Roberts
Samuel B. Roberts Kai
B Sentaka Type C
0 0 0 0 fast slow
0 1 0 0 fast slow fast slow
1+ 0 1+ 0 fast slow
1+ 0 0 1+ 0 fast fast slow fast slow fast slow
1 0 0 0 1 fast + fast
2+ 0 0 0 2+ fast ++
1 1 1 0 fast + fast + fast + fast + fast fast fast
2 1 2 0 fast ++
3+ 1 3+ 0 fast ++ fast +
1 1 0 1 0 fast ++ fast + fast + fast + fast fast + fast fast + fast
2 1 0 2 0 fast ++ fast ++ fast ++ fast + fast +
3+ 1 0 3+ fast ++
2 1 1 1 fast ++ fast + fast ++ fast + fast + fast
3+ 1 2+ 1+ fast ++ fast ++ fast ++ fast +
3+ 1 1+ 2+ fast ++ fast ++ fast ++ fast +
1 1 0 0 1 fast ++ fast + fast + fast + fast + fast + fast fast + fast
2+ 1 0 0 2+ fast ++ fast ++ fast ++ fast +
2 1 0 1 1 fast ++ fast ++ fast ++ fast + fast +