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Carro Armato P40 (Carro Pesante P40) Heavy Tank / Armored Fighting Vehicle (1940)

Authored By Staff Writer | Last Updated: 7/1/2014

The Carro Armato P40 may have been one of the most impressive Italian war-time tanks on paper but reality limited the series in many respects.

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The Carro Armato P40 (more formally Carro Pesante P26/40 for "Heavy Tank P40") was one of the more impressive Italian tank designs of World War 2. The type was classified in Italian nomenclature as a "heavy tank" regardless of its operating weight - generally a departure from both German and Allied tank classifications of the time. She fit decent armor protection (among the best for an Italian tank) as well as a 75mm main gun. Despite its adequate qualities by Italian tank standards, the P 26/40 was generally outclassed on many levels at this stage of the war by the crop of German, Soviet, British and American tanks taking center stage. A little more than 100 P 26/40 tanks were produced before the war's end, with many of these seeing service under the German Army following Italy's surrender in 1943.

In 1940, the Italians began design work on a new 25-ton, "heavy" class infantry support tank intended to operate alongside the "M" family of medium tanks then in service. Recent fighting in the North African campaign showcased the drastic limitations of the Italian tanks then in service, prompting the Italian Army to entertain other options. The primary designation for this new tank was initially "P 75". The selected armament became a short-barreled 75mm 75/32 main gun and this was set within a traversing turret emplacement. The turret was affixed to a hull superstructure and the design was, more or less, of a highly conventional nature with long-running tracked sides - though decidedly Italian in general appearance. The originally selected engine became a diesel-fueled installation of 330 horsepower. The 75mm short-barreled gun was then upgraded to a more potent 75mm long-barrel 75/34 main gun.

After the diesel engine failed to impress, the Italian Army settled on a gasoline-fueled version, forcing Ansaldo engineers back to the development board which served to delay the program. This endeavor eventually produced a gasoline-fueled engine outputting at 420 horsepower. The new tank was now designated as the "P 40" and it was in this end form that the type survived prior to the Italian Armistice. From then on, the tank would be known under the formal designation of "P 26/40" - "26" marking the vehicle's weight in tonnes while "40" denoting its year of adoption into service.

Primary manufacture of the P 26/40 was conducted out of the Ansaldo facility in Northern Italy - even after the Italian Armistice. The vehicle maintained a running length of 19 feet with a width of 9 feet, 2 inches and a height of 8 feet, 2 inches. She was crewed by four personnel that included the driver, the tank commander, the ammunition handler and a radio-operator/machine gunner. Key to this arrangement was the commander for he also doubled as the gun layer which complicated in-the-field actions. Comparable tank systems from other nations incorporated a fifth crewmember to serve as a dedicated gunner while the commander could concentrate on communicating with his crew and observing (and reacting to) battlefield developments - where seconds could spell victory or total doom for the crew. Additionally, the P 26/40 was designed with only a two-man turret system which also limited internal space - three-man turrets were now proving the norm with all new tank designs appearing elsewhere. Not only was the workload of the commander doubled in the Italian design but creature comforts were few and far between. Couple the space required for each work station with the available ammunition stores, engine compartment and transmission "hump" running along the hull floor and one can imagine the rather tight confines of the Italian design. There was no commander's cupola to provide the vehicle commander with a perched position from which to observe actions from afar which proved another tactical limitation in-the-field.

Armor protection for the P 26/40 varied about her design, ranging from 14mm at her thinnest to 60mm at her thickest facings. While something of an improvement over preceding Italian tank designs, this was rather woeful when compared to the anti-tank weaponry being fielded by Italy's enemies. Any anti-tank gun larger than 40mm was said to be able to penetrate the base armor of the P 26/40 with relative ease at this point in the war. To compound issues in the Italian design, the armor was finished in riveted construction as opposed to the much more accepted welded construction appearing on tanks elsewhere. Not only was riveted construction weaker along the plate joints (regardless of actual plate thickness), the rivets themselves could fly about the fighting compartment in response to a direct hit from enemy fire - injuring or outright killing the crew within.


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Specifications for the
Carro Armato P40 (Carro Pesante P40)
Heavy Tank / Armored Fighting Vehicle


Country of Origin: Italy
Manufacturer: Ansaldo - Italy
Initial Year of Service: 1940
Production: 105


Focus Model: Carro Armato P40 (Carro Pesante P40)
Crew: 4


Overall Length: 19.09 ft (5.82 m)
Width: 9.19 ft (2.80 m)
Height: 8.27 ft (2.52 m)
Weight: 29.1 US Short Tons (26,420 kg; 58,246 lb)


Powerplant: 1 x SPA 342 12-cylinder diesel engine developing 275- to 330-horsepower.


Maximum Speed: 22 mph (35 km/h)
Maximum Range: 149 miles (240 km)


NBC Protection: None
Nightvision: None


Armament:
1 x 75mm L/34 main gun (production)
1 x 8mm Breda coaxial machine gun


Ammunition:
65 x 75mm projectiles
600 x 8mm ammunition


Variants:
Carro Armato P 26/40 - Base Series Designation


Carro Pesante P 26/40 - Formal Designation

Carro Armato P 40 - Alternative Designation

Carro Armato P 43 - Proposed Variant; fitting long-barreled 75mm main gun OR 90mm main gun.

Carro Armato P 43bis - Proposed Variant; fitting 480 horsepower gasoline-fueled engine.

Semovente 149/40 - Proposed Self-Propelled Gun; based on the chassis of the P26/40 series; single example produced.


Operators:
Italy; Nazi Germany