R class patrol boat

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Class overview

Name:	R
General characteristics
Type:	patrol boat
Displacement:	51, 52: 90 tons, 110 tons full load 53, 54, 55: 110 tons, 130 tons full load
Length:	51, 52: 31.1 m 53, 54, 55: 33.0 m
Beam:	51, 52: 5.7 m 53, 54, 55: 5.5 m
Draught:	1.8 m
Propulsion:	51, 52: 2× Mercedes-Benz Diesel; 1,044 kW 53, 54, 55: 2× Mercedes-Benz Diesel; 1,864 kW
Speed:	51, 52: 15 knots 53, 54, 55: 17 knots
Armament:	1× 40 mm Bofors 1× 20 mm Madsen 1× Squid ASW mortar
Notes:	Ships in class include: Rymättölä (51), Rihtniemi (52), Ruissalo (53), Raisio (54), Röyttä (55)

The R class patrol boats was a class of Finnish patrol boats, originally constructed as coastal minesweepers. They were modified into patrol boats by the end of the 1960-ies and transferred to the Patrol Flotilla and later to the 7th Missile Flotilla. They were then used for sea patrol and as anti-submarine warfare vessels. They were stricken from the Finnish Navy list in the 1990-ies.

The R class was much liked in the Finnish Navy, due to their low fuel consumption and their good sea going qualities. They were in principle unsinkable (they vessels could have a list of 115 degrees without sinking and still return to upright position).

The three later vessels, Ruissalo, Raisio and Röyttä, were somewhat larger and the vessels are therefore sometimes referred to as the Rihtniemi and Ruissalo classes. However, the Finnish Navy used the designation R class for all five vessels.

[edit] Vessels of the class

Rymättölä (51) / Suurop: Ordered in July 1955 from Rauma-Repola in Rauma, launched in 1956, and entered service on May 20, 1957. She was sold to the Estonian Navy in the early 2000s and are still in service as the Suurop.
Rihtniemi (52) / Ristna: Ordered in July 1955 from Rauma-Repola in Rauma, launched in 1956, and entered service on February 21, 1957. She was sold to the Estonian Navy in the early 2000s and are still in service as the Ristna.
Ruissalo (53): Ordered from Laivateollisuus, Turku. Taken into use on August 11, 1959. Scrapped in the early 2000s.
Raisio (54): Ordered from Laivateollisuus, Turku. Taken into use on September 12, 1959. Sold on the private market.
Röyttä (55): Ordered from Laivateollisuus, Turku. Taken into use on October 14, 1959. Röyttä was transferred to the marine reserve training units in 2000 and is used for training. She was renovated in both 1980 and 2000. She was later sold to a private adventure company in Tampere.
Carlos Alban: Built in 1971. In use 1971-1997. Ruissalo class patrol boat, operated by the Colombian Coast Guard.
Nito Restrepo: Built in 1971. In use 1971-1990. Ruissalo class patrol boat, operated by the Colombian Coast Guard.
Jorge Soto del Corval: Built in 1971. In use 1971-1984. Ruissalo class patrol boat, operated by the Colombian Coast Guard.