Ha-3-class submarine

Japanese submarine Ha-3, in August 1911
Class overview
Name	Ha-3 class
Builders	Vickers, Barrow-in-Furness, UK
Operators	Imperial Japanese Navy
Preceded by	Ha-1 class
Succeeded by	Ha-7 class
In commission	1911–1929
Completed	3
Retired	3
General characteristics
Type	Submarine
Displacement	291 long tons (296 t) surfaced 326 long tons (331 t) submerged
Length	43.3 m (142 ft 1 in)
Beam	4.14 m (13 ft 7 in)
Draft	3.43 m (11 ft 3 in)
Installed power	600 hp (450 kW) (gasoline engines) 300 hp (220 kW) (electric motors)
Propulsion	Gasoline engines Electric motors 1 shaft
Speed	12 knots (22 km/h; 14 mph) surfaced 7 knots (13 km/h; 8.1 mph) submerged
Range	660 nmi (1,220 km; 760 mi) at 12 knots (surfaced) 60 nmi (110 km; 69 mi) at 4 knots (7.4 km/h; 4.6 mph) (submerged)
Test depth	30.5 m (100 ft)
Complement	26 officers and enlisted
Armament	2 × 18 in (460 mm) bow torpedo tubes (4 × torpedoes) 1 × machine gun

The Ha-3-class submarine (波三型潜水艦, Ha-san-gata sensuikan) was an early class of submarines of the Imperial Japanese Navy.

Along with placing orders with Vickers at Barrow-in-Furness in the UK for two British C-class submarines, which were commissioned into the Imperial Japanese Navy as the Ha-1 class, the Japanese government ordered another three vessels, which were received as knock-down kits. These kits were assembled at the Kure Naval Arsenal.^[1]

Physically almost identical to the Ha-1 class, the three vessels assembled in Japan incorporated a number of improvements, including extended bow for improved seaworthiness, improved rudder for surface handling, and an increase in the size of the bridge and conning tower.

• Japanese submarine Ha-3 (波号第三潜水艦, Ha-go Dai-san sensuikan), laid down 1 August 1910; launched 5 March 1911; commissioned 12 August 1911 as Submersible No.10; reclassified as 2nd class submersible on 4 August 1916, reclassified as 3rd class submarine on 1 April 1919; renamed Ha-3 on 15 June 1923, decommissioned on 1 December 1929.^[2]
• Japanese submarine Ha-4 (波号第四潜水艦, Ha-go Dai-yon sensuikan), laid down 1 August 1910; launched 13 March 1911; commissioned 26 August 1911 as Submersible No.11; reclassified as 2nd class submersible on 4 August 1916, reclassified as 3rd class submarine on 1 April 1919; renamed Ha-4 on 15 June 1923; decommissioned on 1 December 1929.^[2]
• Japanese submarine Ha-5 (波号第五潜水艦, Ha-go Dai-go sensuikan), laid down 1 August 1910; launched 27 March 1911; commissioned 3 August 1911 as Submersible No.12; reclassified as 2nd class submersible on 4 August 1916, reclassified as 3rd class submarine on 1 April 1919; renamed Ha-5 on 15 June 1923; decommissioned on 1 December 1929.^[2]

• Chesneau, Roger (1985). Conway's All the World's Fighting Ships 1906–1921. Naval Institute Press. ISBN 0-87021-907-3.
• Howarth, Stephen (1983). The Fighting Ships of the Rising Sun: The Drama of the Imperial Japanese Navy, 1895-1945. Atheneum. ISBN 0-689-11402-8.
• Jentsura, Hansgeorg (1976). Warships of the Imperial Japanese Navy, 1869-1945. Annapolis, MD: Naval Institute Press. ISBN 0-87021-893-X.
• Schencking, J. Charles (2005). Making Waves: Politics, Propaganda, And The Emergence Of The Imperial Japanese Navy, 1868-1922. Stanford University Press. ISBN 0-8047-4977-9.

• Nishida, Hiroshi. "Materials of IJN". Imperial Japanese Navy.