Piratini-class patrol boat

The six "Piratini"-class patrol boats are a series of patrol vessels that were built for the Brazilian Navy at the Rio de Janeiro Navy Arsenal. Based on the United States Coast Guard design, they were built between 1970 and 1971 as coastal patrol vessels. In 1993 they were moved from coastal patrol to riverine patrol.
Description.
Based on the United States Coast Guard design, the patrol vessels have a standard displacement of and a full load displacement of with a length between perpendiculars of , a beam of and a draught. The ships are powered by four Cummins VT-12M diesel engines driving two shafts rated at . This gives the "Piratini" class a maximum speed of and a range of at .
The "Piratini" class was initially armed with a .50 calibre machine gun mount and an mortar mount. In 1988, the 81 mm mortar mount was removed. The main armament was later altered to two machine guns and one Oerlikon cannon. They were initially designed for coastal patrol. In 1993, the class was designated for riverine patrol.
Service history.
The class was constructed as part of the offshore agreement with the United States. All six vessels were completed in 1970–1971. In 2009, "Piratini", "Penedo" and "Poti" were based at Ladário Fluvial Base in Mato Grosso, the others, in Amazonas.