 These guns fired projectiles at a muzzle velocity of ; at 45° this provided a maximum range of , and they had a maximum ceiling of at 75° elevation.Their effective rate of fire was 6 to 8 rounds per minute.She had two Type 89 directors to control her 20 cm guns and two Type 91 manually powered anti-aircraft directors ("Kōshaki") to control her 12 cm guns.