R-class patrol boat

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Patrol Boat 55 in Tampere May2010.jpg
Former patrol boat Röyttä (55) in private ownership
Class overview
Name: RIHTNIEMI
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 1960s 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 1990s.

The R class was much liked in the Finnish Navy, due to their low fuel consumption and their good seagoing qualities. They were in principle unsinkable (the 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.

Vessels of the class[edit]

Rymättylä (51) / Suurop (P 421)
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 1999 as the EML Suurop.
Rihtniemi (52) / Ristna   (P 422)
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 1999 as the EML 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.

Operators[edit]

 Colombia
Three Ruissalo class patrol boats
 Estonia
Two ex-Finnish Rihtniemi class patrol boats
 Finland
Two Rihtniemi and three Ruissalo class patrol boats

External links[edit]