Ha-7-class submarine

	Japanese submarine Ha-7, in trials off Kure, 1916
Class overview
Builders	Kure Naval Arsenal, Japan
Operators	Imperial Japanese Navy
Preceded by	Ha-3 class
Succeeded by	Kaichū type
In commission	1916–1929
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 8.5 knots (15.7 km/h; 9.8 mph) (submerged);
Test depth	30.5 m (100 ft)
Complement	26 officers and enlisted
Armament	4 × 18 in (460 mm) bow torpedo tubes (4 × torpedoes); 1 × machine gun;

The Ha-7-class submarine (波七型潜水艦, Ha-nana-gata sensuikan) was an early class of submarines of the Imperial Japanese Navy. It was also called the "Vickers C-3 class".

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