Japanese submarine Ro-28

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History
Japan
NameSubmarine No. 62
BuilderSasebo Naval Arsenal, Sasebo, Japan
Laid down10 November 1921
Launched13 April 1922
Completed30 November 1923
Commissioned30 November 1923
RenamedRo-28 on 1 November 1924
Decommissioned1 December 1938
Decommissioned1 April 1940
Stricken1 April 1940
RenamedHeisan No. 8 on 1 April 1940
Fate
  • Hulked 1 April 1940
  • Scrapping completed May 1948
General characteristics
Class and typeKaichū type submarine (K4 subclass)
Displacement
  • 762 tonnes (750 long tons) surfaced
  • 1,097 tonnes (1,080 long tons) submerged
Length74.22 m (243 ft 6 in) overall
Beam6.12 m (20 ft 1 in)
Draft3.73 m (12 ft 3 in)
Installed power
Propulsion
Speed
  • 16 knots (30 km/h; 18 mph) surfaced
  • 8.5 knots (15.7 km/h; 9.8 mph) submerged
Range
  • 6,000 nmi (11,000 km; 6,900 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 85 nmi (157 km; 98 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth45.7 m (150 ft)
Crew46
Armament

Ro-28, originally named Submarine No. 46, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū IV subclass. She was in commission from 1923 to 1938 and from 1939 to 1940.

Design and description[edit]

The submarines of the Kaichu IV sub-class were an improved version of the preceding Kaichu III subclass, slightly larger, with heavier torpedoes, and with the deck gun mounted forward of the conning tower instead of aft of it.[1] They displaced 762 tonnes (750 long tons) surfaced and 1,097 tonnes (1,080 long tons) submerged. The submarines were 74.22 meters (243 ft 6 in) long and had a beam of 6.12 meters (20 ft 1 in) and a draft of 3.73 meters (12 ft 3 in). They had a diving depth of 45.7 meters (150 ft).

For surface running, the submarines were powered by two 1,450-brake-horsepower (1,081 kW) Sulzer Mark II diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 16 knots (30 km/h; 18 mph) on the surface and 8.5 knots (15.7 km/h; 9.8 mph) underwater. On the surface, they had a range of 6,000 nautical miles (11,000 km; 6,900 mi) at 10 knots (19 km/h; 12 mph); submerged, they had a range of 85 nmi (157 km; 98 mi) at 4 knots (7.4 km/h; 4.6 mph).

The submarines were armed with four internal bow 533 mm (21.0 in) torpedo tubes and carried a total of eight torpedoes. They were also armed with a single 76.2 mm (3.00 in) deck gun.

Construction and commissioning[edit]

Ro-28 was laid down as Submarine No. 62 on 10 November 1921 by the Yokosuka Naval Arsenal at Yokosuka, Japan.[2] Launched on 13 April 1922,[2] she was completed and commissioned on 30 November 1923.[2]

Service history[edit]

Upon commissioning, Submarine No. 62 was attached to the Kure Naval District,[2] and on 15 December 1923 she was assigned to Submarine Division 14 and the Kure Defense Division.[2] On 20 August 1924, Submarine Division 14 was assigned to Submarine Squadron 2 in the 2nd Fleet.[2] On 14 June 1924, Submarine No. 62 collided with the battlecruiser Kongō while conducting a practice attack.[3]

On 1 November 1924, Submarine No. 62 was renamed Ro-28.[2] Submarine Division 14 was reassigned to the Kure Naval District on 1 August 1925,[4] and on 18 August 1925 began duty with the Kure Defense Division.[2] This lasted until 1 December 1925, when the division returned to Submarine Squadron 2 in the 2nd Fleet.[2] On 6 April 1926, Ro-28 collided with her sister ship Ro-27.[3] Neither submarine suffered casualties.[3]

On 1 December 1926, Submarine Division 14 was reassigned to the Kure Naval District.[2] Ro-28 was assigned directly to the Kure Naval District on 15 January 1927, returned to Submarine Division 14 on 1 September 1927, and had duty in the Kure Defense Division from 10 December 1928 to 30 November 1929, when she again was assigned directly to the Kure Naval District.[2]

Ro-28 again returned to Submarine Division 14 on 1 December 1931, and remained in it for the remainder of her active career.[2] In the years that followed, she served in the Kure Defense Division from 1 October 1932 to 1 February 1933 and from 1 December 1933 to 15 November 1934[2] and underwent a refit in 1934.[2] She sank in an accidental flooding incident in the harbor at Wajima, Japan, in 1935, but was refloated, repaired, and returned to service.[2]

Ro-28 was decommissioned on 1 December 1938 and placed in Fourth Reserve in the Kure Naval District.[2] She was recommissioned on 1 May 1939 and assigned directly to the Kure Naval District.[2]

Ro-28 was decommissioned and stricken from the Navy list on 1 April 1940.[2] She served subsequently as the training hulk Heisan No. 8 at the submarine school at Kure, Japan.[2] She was sold for scrap after World War II and scrapped at Kumagaya Gumi, Japan.[1][2] Scrapping was completed in May 1948.[1][2]

Notes[edit]

  1. ^ a b c Gray, Randal, ed., Conway′s All the World′s Fighting Ships 1906–1921, Annapolis, Maryland: Naval Institute Press, 1985, ISBN 0 87021 907 3, p. 247.
  2. ^ a b c d e f g h i j k l m n o p q r s t u "RO-28 ex No-62". iijnsubsite.info. 2018. Retrieved 12 October 2020.
  3. ^ a b c Airship Investigation: Report of Col. Henry Breckenridge, Washington, D.C.: Government Printing Office, 1933, p. 56.
  4. ^ "RO-26 ex No-46". iijnsubsite.info. 2018. Retrieved 12 October 2020.

References[edit]

  • "Rekishi Gunzō"., History of Pacific War Vol.17 I-Gō Submarines, Gakken (Japan), January 1998, ISBN 4-05-601767-0
  • Rekishi Gunzō, History of Pacific War Extra, "Perfect guide, The submarines of the Imperial Japanese Forces", Gakken (Japan), March 2005, ISBN 4-05-603890-2
  • The Maru Special, Japanese Naval Vessels No.43 Japanese Submarines III, Ushio Shobō (Japan), September 1980, Book code 68343-44
  • The Maru Special, Japanese Naval Vessels No.132 Japanese Submarines I "Revised edition", Ushio Shobō (Japan), February 1988, Book code 68344-36
  • The Maru Special, Japanese Naval Vessels No.133 Japanese Submarines II "Revised edition", Ushio Shobō (Japan), March 1988, Book code 68344-37
  • The Maru Special, Japanese Naval Vessels No.135 Japanese Submarines IV, Ushio Shobō (Japan), May 1988, Book code 68344-39
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