Partials/Speed system

See full page: Improving Ship Speed

Ship's speed can take the following values:

• Slow (低速)
• Fast (高速)
• Fast+ (高速+)
• Fastest (最速)

Initially, a ship is either slow or fast, the speed can be increased (from slow to fast to fast+ to fastest) using the engine synergy, by equipping a turbine (can be equipped in the expansion slot) and one or more boilers (Enhanced Kanhon Type Boiler and New Model High Temperature High Pressure Boiler) on a ship. The effects are

• Increase in speed, slow ships will be fast and will count as fast for branching rules. It is also assumed that fast+ and fastest will have their own branching rules in the future.
  • Note, however, that this doesn't change ship types, initially slow BB and BBV (ship types 9 and 10) can have fast speed, but still aren't FBB (ship type 8).
• Devs claim that higher speed values increase evasion. However, its magnitude/scope/existence is still investigated by players (preliminary tests suggest that there is no significant increase in evasion).
• Fast+ and Fastest speed values allow BB and BBV to be used in the CTF/STF escort fleet.

Speed and engine synergy
+13 boilers	+10 boilers	Group/Speed							Equipment evasion	Slots required
		Fast				Slow
		A	B1	B2	C	A	B	C
0	1	Fast+	Fast+	Fast+	Fast+	Fast	Fast	Fast	16	2
0	2	Fastest	Fast+	Fast+	Fast+	Fast	Fast	Fast	26	3
0	3+	Fastest	Fast+	Fastest	Fast+	Fast	Fast+	Fast	36+	4+
1	0	Fastest	Fast+	Fast+	Fast+	Fast	Fast	Fast	19	2
1	1	Fastest	Fastest	Fast+	Fast+	Fast+	Fast	Fast	29	3
2	0	Fastest	Fastest	Fastest	Fast+	Fast+	Fast+	Fast	32	3
1	2+	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast	39+	4+
2	1+	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast	42+	4+
3+	0+	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast	45+	4+

Simplified table
Speed Increment	Required Boiler		Fast A	Fast B1 Slow A	Fast B2 Slow B	Fast C Slow C
+1	Any boiler		1
+2	Either	+13 boilers	1	2	2	N/A
	Or	+13 boilers, and	0	1	0
		Total boiler count	2	2	3
+3 (initially-slow ships only)	Either	+13 boilers	N/A	3	N/A
	Or	+13 boilers, and		1
		Total boiler count		3

Speed groups
Initial speed	Group	Ships, classes, types
		Destroyers	Light Cruisers	Heavy Cruisers	Battleships	Carriers	Others
Fast	A	Shimakaze · Tashkent		Tone-class  · Mogami-class		Taihou · Shoukaku-class  · Mogami-class CVL
	B1	Amatsukaze	Agano-class		Kongou-class  · Iowa · Yamato Kai Ni	Souryuu · Hiryuu · Unryuu · Amagi
	B2	Other DD	Other CL · CLT  · Yuubari Kai Ni/D	Other CA	Other FBB	Fast CVL · Other CV
	C	Samuel B. Roberts Mk.II	Yuubari			Kaga	Fast AV
Slow	A				Yamato-class  · Nagato-class Kai Ni	Houshou Kai Ni/Sen
	B	Samuel B. Roberts	Yuubari Kai Ni Toku		Other BB · BBV · Gangut	Slow CVL	Slow AV  · AS  · CT  · Other AO (all forms)  · Shinshuu Maru
	C						SS · SSV · AR · Hayasui · Akitsu Maru

Speed exceptions
Ships	Speed group	Exception	Notes
I-201-class	Slow C	+1 fit bonus with the New Model High Temperature High Pressure Boiler	Not self-stackable
Yuubari Kai Ni Toku Samuel B. Roberts/Kai	Slow B	Speed set to Fast when equipping a Improved Kanhon Type Turbine	Not self-stackable Bonus only work if no "other" variants of Engine Improvement equipment are equipped Regular speed modding behaviors then.
Houshou Kai Ni/Sen	Slow A	Speed set to Fast when equipping a New Model High Temperature High Pressure Boiler