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Constituição on 15 July 1996 during UNITAS '96
|Name:||Niterói class, Mk10|
|Builders:||Vosper Thornycroft, Navy Arsenal in Rio de Janeiro|
|Length:||129.2 m (424 ft)|
|Beam:||13.5 m (44 ft)|
|Draught:||5.5 m (18 ft)|
|Propulsion:||Combined diesel or gas, two shafts|
|Aviation facilities:||Helipad and hangar|
The Niterói class were designed and built by the British shipyard Vosper Thornycroft (VT) in the 1970s. These frigates were designated the Mk 10 by Vosper Thornycroft and are the largest of a series of ships built by that shipyard for both foreign buyers and the Royal Navy.
All of them were extensively modernized between 1996 and 2005 under the 'ModFrag' program. The projected completion was 2001, but due to lack of funds and sea trials to verify the new software, the entire program had been slipped to 2005.
A total of six ships were built. Two of the anti submarine (ASW) and both of the general purpose (GP) version were built in England. The remaining two ASW ships were built at the Arsenal da Marinha in Rio de Janeiro with assistance from VT. The ASW ships had an Ikara missile launcher in Y position aft of the flight deck. This was removed as part of the modernisation programme. The GP ships had a second 4.5-inch (114 mm) gun in "Y" position. A seventh ship was built as the navy's main training unit. The ship is identical to the other ships of the class, but is not fitted with weapons or sensors.
|Pennant number||Name||Builder||Laid Down||Launched||Commissioned||Type||Current status|
|F40||Niterói||Vosper Thornycroft||8 June 1972||8 February 1974||20 November 1976||ASW||In service|
|F41||Defensora||Vosper Thornycroft||14 December 1972||27 March 1975||3 March 1977||ASW||In service|
|F42||Constituição||Vosper Thornycroft||13 March 1974||15 April 1976||31 March 1978||GP||In service|
|F43||Liberal||Vosper Thornycroft||2 May 1975||7 February 1977||18 November 1978||GP||In service|
|F44||Independência||Arsenal de Marinha, Rio de Janeiro||11 June 1972||2 September 1974||3 September 1979||ASW||In service|
|F45||União||Arsenal de Marinha, Rio de Janeiro||11 June 1972||14 March 1975||12 September 1980||ASW||In service|
|U27||Brasil||Arsenal de Marinha, Rio de Janeiro||18 September 1981||2 September 1983||21 August 1986||Training||In service|
- Saunders 2002, p. 61.
- Saunders 2002, p. 70.
- Marinha do Brasil (Brazilian Navy)
- Conway's All the World's Fighting Ships 1947–1995
- Cicalesi, J.C. e Del Gaizo, Cesar: La Marina brasiliana oggi, RiD magazine, Chiavari, June 2006, pag. 50–55
- Saunders, Stephen. Jane's Fighting Ships 2002–2003. Coulsdon, UK: Jane's Information Group, 2002. ISBN 0710624328.
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