The Bragadin-class submarines were built for the Italian: [[Regia Marina]] (Royal Italian Navy) during the late 1920s. Both boats participated in the Second World War and were discarded in 1948.
The Bragadin-class submarines were essentially minelaying versions of the earlier . They shared that class's problems with stability and had to be modified to correct those problems after completion. They displaced 981sp=usNaNsp=us surfaced and 1167sp=usNaNsp=us submerged. As built the submarines were 71.50NaN0 long, had a beam of 6.15m (20.18feet) and a draft of 4.80NaN0. In 1935 the stern was shortened and the boats were bulged to improve their stability. They now measured 68sp=usNaNsp=us in length and had a beam of 7.1m (23.3feet) and draft of 4.3m (14.1feet). They had an operational diving depth of 90m (300feet). Their crew numbered 56 officers and enlisted men.
For surface running, the boats were powered by two 7500NaN0 diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 500bhp electric motor. They could reach 11.5kn on the surface and underwater. On the surface, the Bragadin class had a range of 4180nmi at, submerged, they had a range of 86nmi at .[1]
The boats were armed with four internal 53.3cm (21inches) torpedo tubes in the bow for which they carried six torpedoes. In the stern were two tubes which could accommodate a total of 16 or 24 naval mines, depending on the type. They were also armed with one 102abbr=onNaNabbr=on deck gun for combat on the surface. Their anti-aircraft armament consisted of two 13.2mm machine guns.[2]
| Ship | Builder | Laid down[3] | Launched | Completed | Fate |
|---|---|---|---|---|---|
| Cantiere Navale Triestino, Trieste | 3 Feb 1927 | 21 Jul 1929 | 16 Nov 1931 | Stricken from the Navy List, 1 Feb 1948 | |
| 4 Jul 1927 | 30 Mar 1930 | 17 Nov 1931 |
. Fraccaroli . Aldo . Italian Warships of World War II . 1968 . Ian Allan . Shepperton, UK . 0-7110-0002-6. Aldo Fraccaroli.
. Chronology of the War at Sea 1939–1945: The Naval History of World War Two. Naval Institute Press. Annapolis, Maryland. 2005. Third Revised. 1-59114-119-2. Jürgen Rohwer.