Partials/Speed system

Ship's speed can take the following values:

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 currently the only effect from higher speed is increase in evasion. However, its magnitude/scope/existence is still investigated by players (preliminary tests suggest that there is no significant increase in evasion^[1]^[2]).

Speed groups
Initial speed	Group	Ships, classes, types
Initial speed	Group	Destroyers	Light Cruisers	Heavy Cruisers	Battleships	Carriers	Others
Fast	A	Shimakaze		Tone-class Class, Mogami-class Class		Taihou, Shoukaku-class Class
	B₁	Amatsukaze	Agano-class Class		Kongou-class Class, Iowa	Souryuu, Hiryuu, Unryuu, Amagi
	B₂	Others	Other CL, CLT	Others	Other FBB	Fast CVL, Akagi, Katsuragi
	C		Yuubari			Kaga	Fast AV
Slow	A				Yamato-class Class
	B		CT		Other BB, BBV	Slow CVL	Slow AV, AS
	C						SS, SSV, LHA, AR, AO

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