Ruotsinsalmi-class minelayer

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Riilahti
Class overview
Name	Ruotsinsalmi class
Builders	Wärtsilä Crichton-Vulcan
Operators	Finnish Navy
Succeeded by	Keihässalmi
In service	1941–1975
Completed	2
Lost	1
Scrapped	1
General characteristics
Type	Minelayer
Displacement	310 tons
Length	50 m (164 ft 1 in)
Beam	7.9 m (25 ft 11 in)
Draught	1.5 m (4 ft 11 in)
Propulsion	2 × MAN diesel, 894 kW (1,199 hp) later 2 × Rateau diesel, 835 kW (1,120 hp)
Speed	15 knots (28 km/h; 17 mph)
Sensors and processing systems	Hydrophones
Electronic warfare & decoys	Decoy: Smoke generators
Armament	1 × 75 mm (3.0 in) gun 1 × 40 mm (1.6 in) Bofors gun 2 × 20 mm (0.79 in) Madsen anti-aircraft cannons Depth charge launchers 3 × rails for 100 mines

The Ruotsinsalmi-class minelayers were a two-strong class of minelayers in the Finnish Navy.

Both ships were launched in 1940 and named after famous 18th-century sea battles between Sweden and Russia.

New minelayers for the navy[]

Funding for two new minelayers had been secured as early as in 1937, but instead the money was used to refurbish the garrison at Mäkiluoto. Riilahti was launched on December 14, 1940, three weeks after her sister ship Ruotsinsalmi.

The vessels differed somewhat, Riilahti having an extensively modified propulsion system and hull, compared to its sister vessel.

Originally, the vessels were intended as escort minesweepers for the Finnish Navy's coastal defence ships Ilmarinen and Väinämöinen, and they were therefore designed with a draft of only 1.5 metres (4 ft 11 in). The ships were armed with one 75 mm (3.0 in) gun, one Bofors 40 mm (1.6 in) guns and two Madsen 20 mm (0.79 in) anti-aircraft cannon. The vessel had three mine dropping rails, and could carry about 100 mines. The ship could also hunt submarines, and was equipped with hydrophones, depth charge throwers and rails. The vessel was also strong enough to be able to tow minesweeping equipment. It was equipped with smoke generators so it could protect itself, and other near-by vessel from enemy vessels.

Vessels of the class[]