Partials/Speed system

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 slotReinforcement Expansion) 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 A	Fast B1	Fast B2	Fast C	Slow A	Slow B	Slow B*	Slow C
0	0	Fast	Fast	Fast	Fast	Slow	Slow	Fast	Slow	6	1
0	1	Fast+	Fast+	Fast+	Fast+	Fast	Fast	Fast	Fast	16	2
0	2	Fastest	Fast+	Fast+	Fast+	Fast	Fast	Fast	Fast	26	3
0	3+	Fastest	Fast+	Fastest	Fast+	Fast	Fast+	Fast+	Fast	36+	4+
1	0	Fastest	Fast+	Fast+	Fast+	Fast	Fast	Fast	Fast	19	2
1	1	Fastest	Fastest	Fast+	Fast+	Fast+	Fast	Fast	Fast	29	3
1	2	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast+	Fast	39	4
1	3	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast+	Fast	49	5
2	0	Fastest	Fastest	Fastest	Fast+	Fast+	Fast+	Fast+	Fast	32	3
2	1	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast+	Fast	42	4
2	2	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	Fast+	Fast	52	5
3+	0+	Fastest	Fastest	Fastest	Fast+	Fastest	Fast+	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 Class		Kongou-class Class, Iowa	Souryuu, Hiryuu, Unryuu, Amagi
	B2	Others	Other CL, CLT , Yuubari Kai Ni	Others	Other FBB	Fast CVL, Other CV
	C		Yuubari			Kaga	Fast AV
Slow	A				Yamato-class , Nagato-class Kai Ni
	B		CT		Other BB, BBV, Gangut	Slow CVL	Slow AV, AS, Shinshuu Maru, Kamoi
	B*	Samuel B. Roberts	Yuubari Kai Ni Toku
	C						SS, SSV, AR, Akitsu Maru, Hayasui