In 1928, studies began for a new Trento class heavy cruiser but with some differences respect the others. The new ship must keep the same main artillery, a maximum speed of 36 knots and facilities for a Fleet’s Admiral as in the Zara class cruisers. In 1929 the construction of the Bolzano cruiser was approved. She was similar to Trento class, but with many differences in the protection scheme and the boiler equipment among others. Even the 203mm guns were different, being these of a lighter type. In 1941 she took part in the Battle of Cape Matapan and was torpedoed in August by the HMS Triumph submarine, but withoutserious damage. Again, in August 1942 Bolzano was attacked by the HMS Unbroken submarine, and in this occasion she had serious damages and was towed to port. Damages were not repaired during the rest of the War and on June 21, 1944, she was sunk in an Anglo-Italian frogmen attack using Chariot manned torpedoes.

BOLZANO gallery and more info


Información adicional

Ficha Completa
Country of origin



Ansaldo shipbuilding, Genoa


Heavy cruiser

Entered service




Displacement, (full load)

13,883 tonnes

Dimensions (length x beam x draught)

196.90 x 20.60 x 6.60 meters

Armour, (maximum)

Steel: Belt: 70mm – Armoured deck: 50mm – Main turrets: 100mm – Command tower: 100mm


10 x Yarrow-Ansaldo boilers – 4 x Parsons SR shaft geared turbines

Power, (total)

150,000 shp

Shafts - Screws

4 shafts – 4 screws


35 Knots (65 km/h)


2,224 tonnes of fuel oil


4,430 n. miles (8,195 km) at 16 knots


3 seaplanes

Main guns

8 x 203/53mm guns in twin turrets

Secondary guns

16 x 100/47mm guns in twin turrets

AA guns

4 x 40/39mm Vickers-Terni guns

Machine guns

8 x 13.2mm in twin mounts


8 x 533mm torpedo tubes in twin assemblies