River class submarine

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For other naval ship classes of the same name, see River class.

The River class, or Thames class were a class of submarines built for the Royal Navy.

They were the last attempt by the Admiralty to produce "Fleet Submarines" that is submarines fast enough to operate as part of a fleet which at the time meant being able to manage somewhere around 20 knots while surfaced. The previous attempts had been the steam powered K class submarines and the large 12-inch gunned M class submarines.

A design was drawn up in the late 1920s and three vessels were built by Vickers in Barrow, Thames in 1931, Severn and Clyde in 1935. The latter were a little larger than Thames. Initially 20 were planned but changes in thinking and cost limited the building to just the three.

The design compromised on diving depth to keep weight down and speed up. They had a safe diving depth of some 300 feet compared to the Odin class before them which had managed 500 feet. They were powered by two diesel engines delivering 8000 bhp. Two Ricardo engines drove generators that supercharged the diesels up to 10,000 bhp. This gave them a surface speed of 22 knots.

During the Second World War they initially operated in the North Sea and Mediterranean.

Thames was lost off Norway on 23 September 1940. Clyde was used to deliver suppplies to the besieged island of Malta in September 1941. Severn and Clyde were in service in the Far East when they were taken out of service in mid to late 1945.

[edit] General Characteristics

From Conway's All the World's Fighting ships 1922-1946

Displacement
- Surfaced - 2206 tons (Thames 2165 tons)
- Submerged - 2723 tons (Thames 2680 tons)
Length - 105.15 m / 345 ft
Beam - 8.61 m / 28 ft 3 in
Draught - 4.85 m
Machinery - 2 shaft diesel electric
- 2 supercharged diesels 10,000 hp max
- 2 electric motors 2500 hp
Speed
- Surfaced - 22 knots
- Submerged - 10 knots
Range
Armament
- 6 - 21 in torpedo tubes (bow)
- 1 - 4 inch deck gun
Crew - 61