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Otobreda 127/54 Compact

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Otobreda 127mm/54C
Calibre: 127 mm (5 inch)
Mass of the system: 37500 kg (without ammunition)
Magazine: 66 (ready to fire in three drums)
Mass of one round: 888 mm length shell: 15.44 kg
665 mm length shell: 31.75 kg
Elevation: Minimum -15°
Maximum +83°
Range: ±30 km (100 km with guided VOLCANO ammunition)
Turning limitation: 165° port and starboard (330° total)
Rotation speed: 40°/s (with acceleration of 45°/s2)
Elevation speed: 30°/s (with acceleration of 40°/s2)
Cooling: sea water - fresh water for flushing
Rate of fire: 40 rds/min
Electrical Power supply 440V, 3-phase, 60 Hz (275kVA - 20% max peak power for 0.4 sec)

The Otobreda 127mm/54 Compact (127/54C) gun is a dual purpose naval artillery piece built by the Italian company Oto Melara. It uses the 127mm round which is also used in the 5 inch/ 54 gun, albeit that this gun calibre is measured in imperial measurements rather then metric. The gun uses an automatic loading system where 66 127mm rounds of various kinds can be stored ready-to-fire in three loader drums (each holding 22 rounds). The barrel is water-cooled. Currently the gun is still in use by navies around the world but it is slowly being replaced by the Otobreda 127/64 for new vessels, of which the German Navy F-125 class frigate and Italian Navy FREMM

Users

The Otobreda 127/54 Compact and 127/54 Lightweight are used on the following ships:

Also, the Otobreda 127/54 was used on the Canadian Iroquois class destroyers prior to their TRUMP refits in the early 1990s, when they were replaced with the Otobreda 76 mm naval gun.