CANT Z.506 Airone

Italian patrol floatplane

The CANT Z.506 Airone (Italian: Heron) was a trimotor floatplane produced by CANT from 1935. It served as a transport and postal aircraft with the Italian airline "Ala Littoria". It established 10 world records in 1936 and another 10 in 1937. During World War II it was used as a reconnaissance aircraft, bomber and air sea rescue plane, by the Italian Regia Aeronautica and Regia Marina, Aeronautica Cobelligerante del Sud, Aeronautica Nazionale Repubblicana and the Luftwaffe. The military version revealed itself to be one of the best floatplanes ever built. Despite its wooden structure it was able to operate in very rough seas. A number of Z.506S air sea rescue aircraft remained in service until 1959.

The CANT Z.506 was designed as a 12 to 14 seat transport twin float floatplane, powered by three Piaggio Stella P. IX radial engines. It was derived from the larger and heavier Z.505 seaplane. The Z.506 entered production in 1936 as the Z.506A, powered by more powerful Alfa Romeo 126 RC.34 nine cylinder radial engines, giving a maximum output of 780 CV on takeoff and 750 CV at 3,400 meters. The fuselage had a wooden structure covered in tulipier wooden lamellas. The wings were built with a structure of three box type spars linked by wooden wing ribs covered by plywood. The floats were made of duraluminium covered in 'Chitonal' and were long. The armament consisted of a Breda SAFAT machine gun in the dorsal position and three machine guns, one in the ventral position and two on the sides of the fuselage. The CANT Z.506 had a crew of five. It was produced at the "Cantieri Riuniti dell 'Adriatico" and "Cantiere Navale Triestino" (CRDA CANT) factories in Monfalcone and Finale Ligure respectively. The aeroplanes were in such demand that the Piaggio company also produced CANT Z.506s. under licence. The Z.506A entered service with the Ala Littoria air company flying around the Mediterranean. While flown mostly by Mario Stoppani, the Z.506A set a number of altitude, speed and distance records for its class between 1936 and 1938, including speeds of over and over , and over It subsequently flew in a closed circuit. It carried a load of to and to A larger version of the Z.506A was built in 1937 as the Z.509. The last CANT Z.506B was built by Piaggio in January 1943. Total production was more than 320 aircraft. On the outbreak of World War II, four Squadriglie for air sea rescue missions were formed in Orbetello. These were the 612ª in Stagnoni, with aircraft marked DAMB, GORO, BUIE, CANT (the prototype) and POLA, and the 614ª in Benghazi, with DUCO, ALA, DODO and DAIM. The two other sections with two aircraft each were based in Torre del Lago and in the Aegean Sea at Leros. The latter was later transferred to Rhodes. The Z.506 saw its first action on 17 June 1940, the day after some French bombers had attacked Elmas base, killing 21 airmen and destroying some CANT Z.501s. On the evening of 17 June, four Z.506Bs from 31° Stormo attacked targets in French North Africa, each dropping two 250 kg and three 100 kg bombs. A special air sea rescue version, the Z.506S Soccorso, was produced; it was used in small numbers by the Luftwaffe. The air sea rescue Z.506s suffered severe losses as many Allied pilots did not stop attacking them, even after they had spotted the red crosses. For instance, on 12 June 1942, off Malta, a Hawker Hurricane from 46 Squadron shot down a Z.506, then shot another one down which had been sent to rescue the crew of the first. Sergeant Etchells, in 249 at Malta recalled:
I shot down a Cant Z506 near Sicily, painted white, which had red crosses on its wings, and was apparently an air rescue aircraft. Sqn Ldr Barton disapproved but the AOC approved. I did not see the red crosses on its wings at the time and do not know if it would have made any difference had I done so." A CANT Z.506 became famous, among the Allies, because it was the only plane hijacked by prisoners of war on the Western Front (it was then used by the RAF from Malta). Occasionally the CANT Z.506s managed to shoot down the Allied aircraft that attacked them. On 7 January 1943, a "recce" seaplane from 188ª Squadriglia was attacked on the Mediterranean by two Bristol Blenheim. While pilot Maresciallo Ambrogio Serri headed for Sardinia, Armiere Pietro Bonannini with five bursts of shots from the 12.7 mm machine gun, managed to hit a first Blenheim, that ditched in the sea. Then, the second Blenheim closed on the CANT, strafing it. Bonannini was wounded but he managed to hit the enemy aircraft, that veered and fell overboard. Bonannini, during the war was awarded three Medaglie d'Argento al Valore Militare and a Medaglia di bronzo al Valor Militare. When Italy surrendered to the Allies, on 8 September 1943, about 70 CANT Z.506s were still in service with the Italian Air Force. About 30 surviving Z.506S were assimilated into Allied forces Some examples survived in postwar service until 1959.

The only surviving CANT is a model Z.506 B, produced in 1941. Faithfully restored, it belongs to the 15th lot and has the construction number MM.45425. It was tested by Nicolò Lana on December 19, 1941, and registered with the number 84 4. It was delivered on January 12, 1942, and assigned to the 186ª Squadriglia, based in Agusta, Sicily, and carried out its first mission on January 12, 1942. It is exhibited at the Italian Air Force Museum (Museo Storico dell'Aeronautica), in Vigna di Valle, near Bracciano, north of Rome.