In 1984 Brazil contracted with Howaldtswerke-Deutsche Werft for six Tupi class submarines to the Type 1400 subvariant of the U-209 model, the first built in Kiel and the other five in Rio de Janeiro. Financial constraints trimmed the Brazilian-built quantity to three, while the pair of Tikuna-class boats, to an improved Tupi class standard, were far behind schedule: the Tikuna's commissioning date was delayed from 2000 to 2005 and work on the Tapuia has been suspended.
Brazil established an uranium-enrichment plant in 1988 with the announced intention of building an SSN, but this project has not proceeded beyond the design stage. The Tikuna-class boats were described as intermediate between the older SSKs and an SSN.
The Tupi class boats operate from Moncangue island's Base Almirante Castro e Silva across the bay from Rio. These are well armed small boats, carrying a combination of British Mk 24 Tigerfish torpedoes and an anti-submarine torpedo developed by the IPqM (Instituto de Pesquisas da Marinha, or naval research institute). Eight torpedoes are carried in the tubes and there are eight reloads. The Tigerfish is a wire-guided torpedo capable of active homing at 35 kts to a range of 13 km (8 miles) or passive homing at 24 kts to 29.6 km (18.4 miles) The IPqM torpedo has a swimout launch system and travels up to 18.5 km (11.5 miles) at 45 kts.
The Tikuna-class boats are larger, at 2 425 tons dived, and have a crew of 39. Designed for an endurance of 60 days, they are designed to carry MCF-01/100 acoustic-magnetic mines (produced by IPqM) instead of some torpedoes.
Brazil established an uranium-enrichment plant in 1988 with the announced intention of building an SSN, but this project has not proceeded beyond the design stage. The Tikuna-class boats were described as intermediate between the older SSKs and an SSN.
The Tupi class boats operate from Moncangue island's Base Almirante Castro e Silva across the bay from Rio. These are well armed small boats, carrying a combination of British Mk 24 Tigerfish torpedoes and an anti-submarine torpedo developed by the IPqM (Instituto de Pesquisas da Marinha, or naval research institute). Eight torpedoes are carried in the tubes and there are eight reloads. The Tigerfish is a wire-guided torpedo capable of active homing at 35 kts to a range of 13 km (8 miles) or passive homing at 24 kts to 29.6 km (18.4 miles) The IPqM torpedo has a swimout launch system and travels up to 18.5 km (11.5 miles) at 45 kts.
The Tikuna-class boats are larger, at 2 425 tons dived, and have a crew of 39. Designed for an endurance of 60 days, they are designed to carry MCF-01/100 acoustic-magnetic mines (produced by IPqM) instead of some torpedoes.
| Entered service | 1989 |
| Crew | 30 men |
| Diving depth (operational) | 250 m |
| Dimensions and displacement | |
| Length | 61.2 m |
| Beam | 6.2 m |
| Draught | 5.5 m |
| Surfaced displacement | 1 400 tons |
| Submerged displacement | 1 550 tons |
| Propulsion and speed | |
| Surfaced speed | 11 knots |
| Submerged speed | 21.5 knots |
| Diesel engines | 4 x 2 414 hp |
| Electric motors | 1 x 4 595 hp |
| Armament | |
| Torpedoes | 8 x 533- mm torpedo tubes with up to 16 torpedoes |
| Name | Laid down | Launched | Commissioned | Status |
| Tupi (S30) | 1985 | 1987 | 1989 | active, in service |
| Tamoio (S31) | 1986 | 1993 | 1994 | active, in service |
| Timbira (S32) | 1987 | 1996 | 1996 | active, in service |
| Tapajo (S33) | 1996 | 1998 | 1999 | active, in service |
Source: Military Today
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