Italy, Piemonte-Class
R.N. Campania (1939)
In the early 1930s, Italy’s most powerful destroyers were the twelve Navigatori-class units, which were reasonably well armed and very fast, but had severe stability issues. These could be remedied by widening their hulls and re-distributing weight, at the cost of reducing their design speed by ten knots (from 38 to 28 knots), rendering them useless for fleet work. This left Italy with no effective equivalent to France’s powerful contre-torpilleurs; to make things worse, the Brits started building the successful Tribal-class with twice the gunnery of Italy’s remaining fleet destroyer classes per hull, just when the Navigatori’s were under refit. Something needed to be done. Fortunately for Italy, the reopening of the Sirte oil fields in 1933 – they had been closed down during the Senusi rebellion, which was brutally put down in 1932 – provided the fascist state with direly needed hard currency, and therefore the means to pay for a substantial fleet building programme. Under the 1935 supplementary programme, two aircraft carriers and twelve very large destroyers were approved; they were initially labeled scouts (esploratori), but downrated to destroyers before the first of them was complete. The design process lasted mere days; OTO had sold the very big destroyer Tashkent to the Soviets in 1935, which was considered to be well adaptable to the RM’s needs, and it was adopted with minimal modifications.
The Italian version of Tashkent was slightly heavier than its Soviet pendant, in an attempt to provide some reserve stability for future upgrades. Externally, both designs were vitually identical, and they also had the same engine plant. At 110.000 shp, it was more powerful than the one installed in the contemporary Sicilia-class aircraft carriers; design speed of the new esploratori was fourty knots. Trial figures ranged from 44,4 knots (Campania) to 40,3 knots (Molise); the last six were not pushed to the limit on trials, as the war had already started. To provide firepower worthy of a ship of this size, eight 120mm guns in fully enclosed mounts with mechanical loading assistance were to be installed. With a sustainable ROF of 12 rpm per barrel, these mounts enabled the new esploratori to outgun the slower firing French contre-torpilleurs (except the Mogadors) and meet the Tribals on even terms (more than that if the engagement was prolonged, as the Tribal’s guns were manually loaded). No less than 400 rpg were provided, emphasizing how the Italians planned to rely on ROF over individual shell weight. Torpedoes were very much a secondary armament, and no more than the standard two triple tubes (with 8 reserve torpedoes) were provided. These big ships were the first Italian destroyers with 37mm AA guns; four heavy twin mounts were provided, grouped around the second funnel. Upon completion, eight HMGs were added for close defence. Fire control was provided by a main and a secondary director; for the 37mm guns, two small directors were mounted on the aft superstructure.
Being an OTO design, half the ships were contracted to OTO’s Livorno yard; the others were divided up between smaller yards (Cantieri Navali Riuniti in Ancona and Palermo, and Cantieri dell‘ Tirreno at Riva Trigoso). Due to their designed role as scouts, they received traditional cruiser names, being named after Italian provinces. All twelve were laid down during 1937; OTO built their share somewhat faster than the smaller yards. By 1939, it was evident that Ansaldo would not be able to deliver the new 120mm semi-automatic mounts prior to mid-1940. With war looming, OTO substituted traditional open 120mm twin destroyer mounts as main armament. As they were not only much less effective, but also much lighter, a fifth mount was added and the aft superstructure was cut down and moved astern to accomodate it. This required moving the secondary director abaft the funnel, and two of four 37mm twins had to be deleted. The same redesign was applied to one of the CNR-built ships.
Five of the class were completed before the war started; four of them had ten 120mm mounts oft he standard destroyer type: Campania, Basilicata, Umbria and Liguria.
General characteristics
Displacement-
• 2.950 ts standard / 3.450 ts full load
Length
• 129,3 m pp / 134,5 m cwl /139,5 m oa
Beam
• 13,7 m
Draught
• 4,1 m standard / 5,1 m deep load
Machinery
• 2-shaft geared Belluzzo turbines
• 4 Yarrow boilers
• 110.000 shp
Speed
• 40 knots designed; 35 knots max deep and dirty; 32 knots sustainable; best trial speed 44,4 knots at 129.447 shp
Range
• 5.250 nm, 20 knots
Complement:
• 275 (OTO vessels); 260 (others)
Armament:
• 5x1 120mm L/50 OTO Modello 1936
• 2x2 37mm L/54 Breda Modello 1938
• 6x1 12,7mm HMG
• 2x3 533mm torpedo tubes,
• 1 depth charge rack (12 charges)
• rails for 60 mines