Recognition Guide Warships of the Second World War
Imperial Japanese Navy — Submarine

Japanese submarine I-40

Type B2 submarine

Displacement
2,624 long tons (2,666 t)
Length
108.66 m (356.5 ft)
Beam
9.3 m (30.5 ft)
Speed
23.5 knots (43.5 km/h, 27 mph)
Complement
114
Main gun
140 mm (5.5 in)

Service

  1. Imperial Japanese Navy as Submarine No. 37031 July 1943 — 30 April 1944275 days of the war
Type B2 submarine Particulars
Name
I-40
Builder
Kure Naval Arsenal
Laid down
18 March 1942
Launched
10 November 1942
Commissioned
31 July 1943
Struck
30 April 1944
Fate
Missing after 22 November 1943 (1943)
Status
Unknown

Specifications

Displacement, surfaced
2,624 long tons (2,666 t)
Displacement, submerged
3,700 long tons (3,759 t)
Length
108.66 m (356.5 ft)
Beam
9.3 m (30.5 ft)
Draught
5.18 m (17 ft)
Speed
23.5 knots (43.5 km/h, 27 mph)
Range
14,000 nmi (25,928 km)
Complement
114
Main gun
140 mm (5.5 in)

I-40 was a Type B2 submarine, operated by the Imperial Japanese Navy. Kure Naval Arsenal laid her keel on 18 March 1942. Launched on 10 November 1942, she entered service on 31 July 1943.

The class followed the Junsen Type A and was succeeded by the Junsen Type C.

The boat displaced 2,624 long tons surfaced and 3,700 long tons submerged. She measured 108.7 m (356 ft) long with a beam of 9.3 m (31 ft). Her designed speed was 23.5 knots, and she carried a complement of 114.

Her main battery was one 140 mm (5.5 in) guns.

She was in commission for 275 days of the Second World War. She was struck from the register on 30 April 1944.

Written from the harvested record. Every figure above is sourced; the wording is this site's own.

Armament and machinery

Armament and machinery
Propulsion
  • 2 diesels: 11000 hp
  • Electric motors: 2000 hp
Armament
  • 6 × 533 mm forward torpedo tubes
  • 17 torpedoes
  • 1 × 14 cm Deck Gun

Sister ships

Sources