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	B*	C
0	0	Fast				Slow		Fast	Slow	6	1
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
1	2+	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+		Fast	39+	4+
2	0	Fastest	Fastest	Fastest	Fast+	Fast+	Fast+		Fast	32	3
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	Fast B2	Fast C	Slow A	Slow B	Slow B*	Slow C
+1	Just turbine		N/A						1	N/A
	Any boiler		1
+2	Either	+13 boilers	1	2	2	N/A	2	2		N/A
	Or	+13 boilers, and	0	1	0		1	0
		Total boiler count	2	2	3		2	3
+3	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				Other BB · BBV · Gangut	Slow CVL	Slow AV  · AS  · CT  · Other AO (all forms)  · Shinshuu Maru
	B*	Samuel B. Roberts	Yuubari Kai Ni Toku
	C						SS · SSV · AR · Hayasui · Akitsu Maru
I-201-class have a +1 fit bonus with New Model High Temperature High Pressure Boiler (not self-stackable).
Houshou Kai Ni/Sen has a +1 fit bonus with New Model High Temperature High Pressure Boiler (not self-stackable) when NOT equipped with ANY other Engine Improvement type equipment.