Japanese submarine Ro-3
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| History | |
|---|---|
 Japan | |
| Name | Submarine No. 31 |
| Builder | Kawasaki, Kobe, Japan |
| Laid down | 28 October 1919 |
| Launched | 10 March 1921 |
| Completed | 15 July 1922 |
| Commissioned | 15 July 1922 |
| Renamed | Ro-3 on 1 November 1924 |
| Stricken | 1 April 1932 |
| General characteristics | |
| Class & type | Type F submarine (F2 subclass) |
| Displacement |
|
| Length | 65.6 m (215 ft 3 in) overall |
| Beam | 6.1 m (20 ft 0 in) |
| Draft | 4.1 m (13 ft 5 in) |
| Installed power |
|
| Propulsion |
|
| Speed |
|
| Range |
|
| Test depth | 40 m (131 ft) |
| Crew | 43 |
| Armament |
|
Ro-3, originally named Submarine No. 31, was an Imperial Japanese Navy Type F submarine of the F2 subclass. The Type F submarines were the first truly seagoing Japanese submarines, and the earliest to be classified as "second-class" or "medium" submarines of the Ro series. Ro-3 was commissioned in 1922 and operated in the waters of Chōsen and Japan. She was stricken in 1932.
The Type F submarines were designed by the Italian firm Fiat-Laurenti and built under license by Kawasaki at Kobe, Japan.[1] They were the Imperial Japanese Navy′s first true seagoing submarines,[1] and when the Japanese adopted a three-tiered classification system of its submarines as first-class (I), second-class or medium (Ro), and third-class (Ha) on 1 November 1924,[2] the Type F submarines were the earliest to receive the second-class classification,[1] as reflected in their low numbers in the Ro series,[1] and in fact they were the earliest Japanese submarine classified as anything higher than third-class. They had non-cylindrical hulls intended to provide extra internal space, but the Japanese considered the hulls weak despite the provision of additional scantlings during construction to reinforce them.[1]
The submarines of the F2 subclass displaced 700 tonnes (689 long tons) surfaced and 1,064 tonnes (1,047 long tons) submerged.[1] The submarines were 65.6 meters (215 ft 3 in) long and had a beam of 6.1 meters (20 ft 0 in) and a draft of 4.1 meters (13 ft 5 in).[1] They had a diving depth of 40 meters (131 ft).[1] For surface running, the submarines were powered by two 1,300-brake-horsepower (969 kW) Fiat diesel engines, each driving one propeller shaft.[1] When submerged each propeller was driven by a Savigliano 600-horsepower (447 kW) electric motor.[1] They could reach 14 knots (26 km/h; 16 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater.[1] On the surface, they had a range of 3,500 nautical miles (6,500 km; 4,000 mi) at 10 knots (19 km/h; 12 mph);[1] submerged, they had a range of 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph).[1]
The submarines were armed with five 450 mm (18 in) torpedo tubes, three in the bow and two in the stern, and carried a total of eight Type 44 torpedoes.[1] As built, they were armed with a 7.7 mm machine gun.[1] Soon after completion, however, a 76.2 mm (3.00 in) deck gun was added.[1]
In the F2 subclass, the Fiat diesel engines were unreliable and the F2 subclass′s top surface speed of 14 knots (26 km/h; 16 mph) was well below the expected 17 knots (31 km/h; 20 mph).[1] Because of their disappointing performance, the Type F submarines did not serve as the basis for any later Japanese submarine classes.[1]