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I-201 class submarine

Senkou I-202
Sentaka I-202 at high surface speed
Class overview
Builders: Kure Navy Yard
Operators:  Imperial Japanese Navy
Preceded by: I-400-class submarine
Subclasses:
  • I-201-class, Project No. S563
  • I-207-class, Project No. S56B
Built: 1945
In service: 1945
In commission: 1945
Planned: 23
Completed: 3
Scrapped: 3
General characteristics
Type: Submarine
Displacement:
  • 1,290 t (1,270 long tons; 1,420 short tons) surfaced
  • 1,503 t (1,479 long tons; 1,657 short tons) submerged
Length:
  • 79 m (259 ft) overall
  • 59.2 m (194 ft) pressure hull
Beam:
  • 5.8 m (19 ft) pressure hull
  • 9.2 m (30 ft) max. across stern fins
Height: 7 m (23 ft) (keel to main deck)
Propulsion:
  • Diesel-electric
  • 2 × MAN Mk.1 diesel (マ式1号ディーゼル, Ma-Shiki 1 Gō diesel), build by Kawasaki and Mitsubishi. 2,750 hp (2,050 kW)
  • 4 × electric motors, 5,000 hp (3,700 kW) at 600 rpm
  • 2 shafts
Speed:
  • 15.75 knots (29.17 km/h) surfaced
  • 19 knots (35 km/h) submerged
Range:
  • 15,000 nmi (28,000 km) at 6 knots (11 km/h)
  • 7,800 nmi (14,400 km) at 11 knots (20 km/h)
  • 5,800 nmi (10,700 km) at 14 knots (26 km/h)
  • Submerged: 135 nmi (250 km) at 3 knots (5.6 km/h)
Test depth: 110 m (360 ft)
Complement:
  • 31 (plan)
  • approx. 50 (actual)
Armament:

The I-201-class submarines (伊二百一型潜水艦 I-ni-hyaku-ichi-gata sensuikan?) were submarines of the Imperial Japanese Navy during World War II. These submarines were of advanced design, built for high underwater speed, and were known as Sentaka-Dai type submarine (潜高大型潜水艦 Sen-Taka-Dai-gata sensuikan, "Submarine High speed-Large type"?) or Sentaka type submarine (潜高型潜水艦 Sen-Taka-gata sensuikan, "Submarine High speed type"?). The type name, was shortened to Suichū Kōsoku Sensuikan Ō-gata (水中高速潜水艦大型 Underwater High speed Submarine Large type?).

They were one of the fastest submarine class built during World War II, second only to Walter Type XVII closed-cycle powered submarines. Twenty-three units were ordered from the Kure Navy Yard under the 1943 construction program. Due to the deteriorating war situation, only eight boats were laid down, and only three, numbered I-201, I-202 and I-203, were completed before the end of the war. None of them saw operational use.


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