Hai class submarine

Hai-class Submarine
Class overview
Name	Hai-class Submarine
Builders	Telakka N:o 123 Ortonikkilä, Uusilinna
Planned	3
Built	3
Scrapped	3
General Characteristics
Type	Submarine
Displacement	113 long tons (115 t) surfaced 125 long tons (127 t) submerged
Length	19.5 metres (64 ft)
Beam	3.3 metres (11 ft)
Draught	2.9 metres (9.5 ft)
Propulsion	1 × gasoline engine(300 bhp (220 kW)) 1 × electric motor (120 hp (89 kW))
Speed	9 knots (17 km/h; 10 mph) (surfaced) 4.5 knots (8.3 km/h; 5.2 mph) (submerged)
Test depth	50 m
Complement	22
Armament	2 external 15-inch (381 mm) torpedoes on drop collars 1 × machinegun

Development

First operational combat-capable submarines in TTPL service. Designed by Engineer Iivo Puponen. Single hull design with saddle tanks. Somewhat questionable combat value but the class performance was satisfactory enough to convince TTPL to proceed developing the underwater warfare branch.

Ships in class

Name	Builder	Laid down	Launch Date	Entered Service	Fate
Hai	Telakka N:o 123 Ortonikkilä, Uusilinna	August 1901	May 1902	October 1904	Scrapped in 1918
Hauki	Telakka N:o 123 Ortonikkilä, Uusilinna	June 1903	July 1904	November 1905	Sunk in 1913
Lohi	Telakka N:o 123 Ortonikkilä, Uusilinna	June 1903	July 1904	December 1905	Scrapped in 1918

Service history

First unit was build as a prototype, the following pair was laid down only after the first succesfull trials of Hai. Hauki sunk while under transit to Seivästö naval base in 1913. Due their apparent obsolesce, the remaining two were kept as harbour defensive duties in Pohjoismeri during the Great War. Both were scrapped in 1918.

See Also

Ships of Workers' and Peasants' Red Fleet 1883-1922