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

Japanese submarine Ro-66

Type L4 (Ro-60-class) submarine

Length
78.39 m (257.2 ft)
Beam
7.41 m (24.3 ft)
Speed
15.7 knots (29.1 km/h, 18.1 mph)
Complement
48
Main gun
76 mm (3 in)

Service

  1. Imperial Japanese Navy as Ro-6628 July 1927 — 15 January 1942867 days of the war
Type L4 (Ro-60-class) submarine Particulars
Name
Ro-66
Builder
Mitsubishi, Kobe, Japan
Laid down
1 December 1925
Launched
25 October 1926
Commissioned
28 July 1927
Decommissioned
15 November 1930
Recommissioned
1 May 1931
Struck
15 January 1942
Fate
Sunk in collision 17 December 1941
By collision (1941)
Status
Wreck

Specifications

Displacement, submerged
1,301 long tons (1,322 t)
Length
78.39 m (257.2 ft)
Beam
7.41 m (24.3 ft)
Draught
3.96 m (13 ft)
Speed
15.7 knots (29.1 km/h, 18.1 mph)
Range
5,500 nmi (10,186 km)
Complement
48
Main gun
76 mm (3 in)

Ro-66 was a Type L4 (Ro-60-class) submarine built for the Imperial Japanese Navy. Her keel was laid at Mitsubishi, Kobe, Japan on 1 December 1925. Launched on 25 October 1926, she entered service on 28 July 1927.

The boat displaced 1,301 long tons submerged. She measured 78.4 m (257 ft) long with a beam of 7.4 m (24 ft). Her designed speed was 15.7 knots, and she carried a complement of 48.

Her main battery was one 76 mm (3 in) guns.

She was in commission for 867 days of the Second World War. She was decommissioned on 15 November 1930. She recommissioned on 1 May 1931. She was struck from the register on 15 January 1942.

She was sunk on 17 December 1941 by collision, at 19°10′N 166°28′E. The wreck survives.

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 × Vickers diesels, 2 shafts
  • 2,400 bhp (surfaced), 1,600 (submerged)
Armament
  • 6 × 533 mm torpedo tubes (6 × bow)
  • 12 × 6th Year Type torpedoes
  • 1 × 76.2 mm (3.00 in) L/40 naval gun
  • 1 × 6.5 mm machine gun

Sister ships

Sources