Niterói-class frigate

	Liberal and União
Class overview
Name	Niterói class, Mk10
Builders	Vosper Thornycroft; Arsenal de Marinha do Rio de Janeiro;
Operators	Brazilian Navy
Succeeded by	Tamandaré class
Built	1972–1986
In commission	1976–present
Completed	7
Active	6
Retired	1
General characteristics
Type	Frigate
Displacement	3.355 t (3.302 long tons)
Length	129.2 m (423 ft 11 in)
Beam	13.5 m (44 ft 3 in)
Draught	5.5 m (18 ft 1 in)
Propulsion	CODOG, two shafts; 2 × Rolls-Royce Olympus TM-3B gas turbines 42,000 kW (56,000 hp) combined; 4 × MTU 16V 956 TB91 diesel engines 13,000 kW (17,000 hp) combined;
Speed	30 knots (56 km/h; 35 mph) (maximum); 22 knots (41 km/h; 25 mph) (diesels only);
Range	5,300 nmi (9,800 km; 6,100 mi)
Endurance	45 days
Complement	217
Sensors &; processing systems	Modernized;; Alenia RAN-20S air search radar; Terma Scanter surface search radar; Orion RTN-30X fire control radar; Saab EOS-400 optronic director; Krupp Atlas EDO-610E hull mounted sonar; SICONTA Mk 2 C3I system;
Electronic warfare; & decoys	Modernized;; Cutlass B1W ESM; ET/SQL-1 ECM; 12 × 102 mm decoy launchers;
Armament	Modernized;; 1 × Albatros launcher for 8 Aspide surface-to-air missiles; 1 × 114 mm Mark 8 gun; 2 × Bofors 40 mm guns; 2 × twin launchers for Exocet anti-ship missiles; 2 × triple torpedo tubes for Mark 46 torpedoes; 1 × double-barrel Bofors Boroc anti-submarine rockets;
Aircraft carried	Westland Super Lynx Mk.21B helicopter
Aviation facilities	Helipad and hangar

The Niterói class is a series of frigates of the Brazilian Navy built by Vosper Thornycroft of the United Kingdom and Arsenal de Marinha do Rio de Janeiro based on the Type 21 frigates.

Class overview
Liberal and União
Name	Niterói class, Mk10
Builders	Vosper Thornycroft Arsenal de Marinha do Rio de Janeiro
Operators	Brazilian Navy
Succeeded by	Tamandaré class
Built	1972–1986
In commission	1976–present
Completed	7
Active	6
Retired	1
General characteristics
Type	Frigate
Displacement	3.355 t (3.302 long tons)
Length	129.2 m (423 ft 11 in)
Beam	13.5 m (44 ft 3 in)
Draught	5.5 m (18 ft 1 in)
Propulsion	CODOG, two shafts 2 × Rolls-Royce Olympus TM-3B gas turbines 42,000 kW (56,000 hp) combined 4 × MTU 16V 956 TB91 diesel engines 13,000 kW (17,000 hp) combined
Speed	30 knots (56 km/h; 35 mph) (maximum) 22 knots (41 km/h; 25 mph) (diesels only)
Range	5,300 nmi (9,800 km; 6,100 mi)
Endurance	45 days
Complement	217
Sensors & processing systems	Modernized; Alenia RAN-20S air search radar Terma Scanter surface search radar Orion RTN-30X fire control radar Saab EOS-400 optronic director Krupp Atlas EDO-610E hull mounted sonar SICONTA Mk 2 C3I system
Electronic warfare & decoys	Modernized; Cutlass B1W ESM ET/SQL-1 ECM 12 × 102 mm decoy launchers
Armament	Modernized; 1 × Albatros launcher for 8 Aspide surface-to-air missiles 1 × 114 mm Mark 8 gun 2 × Bofors 40 mm guns 2 × twin launchers for Exocet anti-ship missiles 2 × triple torpedo tubes for Mark 46 torpedoes 1 × double-barrel Bofors Boroc anti-submarine rockets
Aircraft carried	Westland Super Lynx Mk.21B helicopter
Aviation facilities	Helipad and hangar