Italian submarine Ametista

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History
Kingdom of Italy
NameAmetista
NamesakeAmethyst
Builder
Muggiano
Laid down16 September 1931
Launched24 April 1933
Completed1 April 1934
FateScuttled 12 September 1943
General characteristics
Class and typeSirena-class submarine
Displacement
  • 691 t (680 long tons) (surfaced)
  • 850 t (837 long tons) (submerged)
Length60.18 m (197 ft 5 in)
Beam6.45 m (21 ft 2 in)
Draft4.7 m (15 ft 5 in)
Installed power
  • 1,350 
    kW
    ) (diesels)
  • 800 hp (600 kW) (electric motors)
Propulsion
Speed
  • 14 knots (26 km/h; 16 mph) (surfaced)
  • 7.5 knots (13.9 km/h; 8.6 mph) (submerged)
Range
  • 5,000 nmi (9,300 km; 5,800 mi) at 8 knots (15 km/h; 9.2 mph) (surfaced)
  • 72 nmi (133 km; 83 mi) at 4 knots (7.4 km/h; 4.6 mph) (submerged)
Crew45
Armament

Ametista was the lead ship of her class of a dozen submarines, the second sub-class of the 600 Series of coastal submarines built for the Regia Marina (Royal Italian Navy) during the early 1930s.

Design and description

The Sirena class was an improved and enlarged version of the preceding Argonauta-class submarines. They displaced 691 metric tons (680 long tons) surfaced and 850 metric tons (837 long tons) submerged. The submarines were 61.5 meters (201 ft 9 in) long, had a beam of 5.7 meters (18 ft 8 in) and a draft of 4.7 meters (15 ft 5 in). Their crew numbered 45 officers and enlisted men.[1]

For surface running, the boats were powered by two 675-

propeller shaft. When submerged each propeller was driven by a 400-horsepower (298 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 7.5 knots (13.9 km/h; 8.6 mph) underwater.[2] On the surface, the Sirena class had a range of 5,000 nautical miles (9,300 km; 5,800 mi) at 8 knots (15 km/h; 9.2 mph);[1] submerged, they had a range of 72 nmi (133 km; 83 mi) at 4 knots (7.4 km/h; 4.6 mph).[2]

The boats were armed with six 53.3-centimeter (21 in)

Construction and career

Ametista was

Muggiano, La Spezia shipyard in 1931, launched on 24 April 1933 and completed the following year.[1]

Notes

  1. ^ a b c d Chesneau, p. 309
  2. ^ a b Bagnasco, p. 148

References

  • Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. .
  • Brescia, Maurizio (2012). Mussolini's Navy: A Reference Guide to the Regina Marina 1930–45. Annapolis, Maryland: Naval Institute Press. .
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. .
  • .
  • uboat.net Ametista (AA) Ametista Accessed 1 May 2022

External links