Ha-1-class submarine

Japanese submarine Ha-2, in 1921
Class overview
Builders	Vickers, Barrow-in-Furness, UK
Operators	Imperial Japanese Navy
Succeeded by	Ha-3 class
In commission	1909–1924
Completed	2
Retired	2
General characteristics
Type	Submarine
Displacement	286 long tons (291 t) surfaced 321 long tons (326 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 (submerged)
Test depth	30.5 metres (100 ft)
Complement	26 officers and enlisted
Armament	2 × 18 in (460 mm) bow torpedo tubes (4 × torpedoes) 1 × machine gun

The Ha-1-class submarine (波一型潜水艦, Ha-ichi-gata sensuikan) was an early class of submarines of the Imperial Japanese Navy, and were essentially British C-class submarines, which had been imported for evaluation and reverse engineering.