Cannone da 90/53

Ansaldo

Industry	Defense, Military manufacturing
Founded	1853
Headquarters	Italy
Products	Artillery, naval guns, military equipment

The Cannone da 90/53 was an artillery piece developed in Italy, employed during World War II primarily as an anti-aircraft warfare weapon, while also serving effectively as an anti-tank gun. It earned a reputation as one of the most efficient anti-aircraft guns deployed throughout the war. The naval adaptation of this cannon was installed on Italian battleships belonging to the Littorio-class and the Andrea Doria-class.

Its designation "90/53" indicates a bore diameter of 90 mm and a barrel length measuring 53 times the caliber.

Naval variant

Following a development phase culminating in 1938, the Ansaldo firm introduced a heavy anti-aircraft cannon for the Regia Marina, intended to supersede the aging Škoda 10 cm K10 and K11 models previously employed on Italian naval vessels. Originally designed with a barrel length of 48 calibers, it was ultimately extended to 50 calibers.

The Cannone da 90/50 Ansaldo Model 1938 alongside the OTO Model 1939 featured an autofretted monobloc barrel coupled with a breech ring secured by screws, housing a horizontal sliding breech block and mounts for recoil and run-out cylinders. A notable aspect of this artillery piece was its unique quadriaxial mounting system: it was pre-stabilized via an intricate mechanism managed by eleven gyroscopes, with two electric motors supplying the required remote power control (RPC). This entire assembly was enclosed within an oval-shaped shielded turret, primarily designed to shield it from the blast pressure generated by the main guns of battleships. The turret had an approximate weight of 20 tons, and its effective firing rate reached 12 rounds per minute. After undergoing trials aboard the armoured cruiser San Giorgio, the 90/50 gun was installed on the new Littorio-class battleships as well as on the two Andrea Doria-class battleships undergoing modernization, totaling twelve and ten mountings respectively.

While the gun demonstrated commendable ballistic capabilities, this system has been characterized as technologically advanced beyond its era, resulting in somewhat fragile mountings. During 1942, the electrical RPC motors were removed from the Andrea Doria-class ships due to damage caused by water ingress; conversely, on the Littorio-class vessels—where mountings were positioned at higher elevations—the RPC system remained operational. Initial ammunition suffered from defects causing shells to fragment into excessively small pieces, diminishing their destructive effect; however, enhanced rounds were introduced throughout the conflict.

Post-World War II, twelve 90/53 guns extracted from the Italian battleship Vittorio Veneto were transferred to Yugoslavia as part of reparations. These weapons were installed within a coastal defense battery located on the island of Žirje, near Šibenik, forming part of Cold War defensive measures. In September 1991, these artillery pieces engaged during the Croatian War of Independence, effectively deterring an assault by the Yugoslav People's Army in the Battle of Šibenik and obstructing thirty-four patrol boats and minesweepers of the Yugoslav Navy that were subsequently captured by Croatian forces within the inner harbor.

Land variant

File:An Italian 90-53 gun on a truck mounting joining the rows of derelict Axis vehicles and equipment jettisoned by Rommel's army.jpg

Cannone da 90/53 mounted on a Lancia truck, abandoned by Rommel’s forces in February 1943

The Cannone da 90/53, adapted from its naval counterpart, was developed by the Ansaldo firm, with initial units produced starting in 1939. The original blueprint envisioned three distinct models:

• The Modello 41P intended for fixed defensive positions; an order of 1,087 units was placed.
• The Modello 41C designed to be towed; 660 units were requested.
• A batch of 57 guns planned for installation on heavy trucks, known as autocannoni da 90/53.

Due to limitations within Italian manufacturing capabilities, only 539 guns had been completed by production’s end in July 1943. This total included 48 adapted for mounting on the Semovente 90/53 tank destroyer. Owing to delays in producing proper mountings, some weapons were fitted on improvised platforms or on flatbeds of trucks such as the Lancia 3Ro and Breda 52, designated as Autocannone da 90/53 su Breda 52.

Inspired by German use of the similar 8.8 cm FlaK 18, the gun served dual roles: as indirect fire artillery and as an anti-tank weapon. In the anti-tank capacity, its armor-piercing rounds could penetrate approximately 140 millimetres (5.5 in) of armor at 500 metres (550 yd) and 120 millimetres (4.7 in) at 1,000 metres (1,100 yd), with some estimates suggesting penetration up to 206 millimetres (8.1 in). This capability allowed it to effectively engage any Allied armored vehicle encountered in North Africa and mainland Italy.

Following Italy’s armistice, captured pieces were re-designated by German forces as 9-cm Flak 309/1(i). These guns were deployed both in Germany for air defense and retained for use within Italy.

Operators

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See also

• Cannone da 75/46 C.A. modello 34
• Italian Army equipment in World War II

Comparable weapons by role, performance, and period

• 8.8 cm Flak 18/36/37/41
• QF 3.7-inch AA gun
• 90 mm Gun M1/M2/M3
• 85 mm air defense gun M1939 (52-K)
• Type 99 88 mm AA gun
• Canon de 90 mm Modèle 1926

References

Citations

Sources

External links

• Category related to Cannone da 90/53 on Wikimedia Commons
• Web resource titled "Italian naval 90 mm/50" available at NavWeaps.com