| CANT Z.506 Airone | |
|---|---|
| Role | Patrol aircraft |
| Manufacturer | CANT |
| First flight | 1935 |
| Introduction | 1936 |
| Retired | 1959 |
| Primary user | Regia Aeronautica |
| Developed into | CANT Z.509 |
The CANT Z.506 Airone (Italian: Heron) was a triple-engine floatplane produced by CANT from 1935. It served as a transport and postal aircraft with the Italian airline "Ala Littoria". 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.[1] A number of Z.506S air-sea rescue aircraft remained in service until 1959.[2]
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The CANT Z.506 was designed as a 12 to 14-seat transport twin-float seaplane, powered by three 455 kW (610 hp) Piaggio Stella IX radial engines. It was derived from the larger and heavier Z.505 seaplane.[3] The Z.506 entered production in 1936 as the Z.506A, powered by more powerful 560 kW (750 hp) Alfa Romeo 126 RC.34 nine cylinder radial engines, giving a maximum output of 780 CV on take off 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 12,50 meters long. The armament consisted of a 12,7 (0,5 inch) Breda-SAFAT machine-gun in the dorsal position and three 7,7 mm (0,303 inch) machineguns, one in the ventral position and two on the sides of the fuselage. It had a crew of 5.[4] It was produced at the "Cantieri Riuniti dell 'Adriatico" and "Cantiere Navale Triestino" (CRDA CANT) factories in Monfalcone and Finale Ligure respectively. It was also produced by Piaggio 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 191.539 mph (308.25 km/h) over 3,107 (5000 km) and 198.7 mph (319.78 km/h) over 1,243 miles (2000 km), and 200.118 mph (322.06 km/h) over 621 miles (1000 km). It subsequently flew 3,345.225 miles (5383.6 km) in a closed circuit. It carried a load of 4,409 lb (2000 kg) to 25,623 ft (7810 m.) and 11,023 lb (5000 kg) to 22,693 ft (6917 m).[3]
A military version was developed as the Z.506B. It was powered by three 560 kW (750 hp) Alfa Romeo 127 RC 55 engines and entered service in 1939. This version was also a record breaker.[5] A larger version of the Z.506A was built in 1937 as the Z.509.
The Z.506B was first used as a reconnaissance aircraft and torpedo bomber in the Spanish Civil War. On the outbreak of World War II, 97 aircraft were operational with two Stormi da Bombardamento Marittimo (sea bombing units) and some Squadriglia da Ricognizione Marittima. 31° Stormo B.M. "autonomo" with 22 planes was based at Cagliari-Elmas airport, in Sardinia; 35° Stormo B.M., with 25 Z.506 in Brindisi, Puglia. It was used extensively in 1940-41 in France and Greece.[6] The type had its baptism of fire 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 506Bs from 31° Stormo attacked targets in Northern French Africa, each dropping two 250 kg and three 100 kg bombs.[6] The type also took part in the Battle of Calabria. In the war against Greece it was used against coastal targets and the Corinth canal. It played an important part in the conquest of many Greek islands, including Corfu, Cephalonia and Zante. Due to its vulnerability against fighters, it was restricted to use by 'recce' units (Squadriglie da Ricognizione).[5] Later in the war, it was used in maritime patrol and air-sea rescue missions. The 506 was often forced to land in Spain, due to engine failure, combat damage or a lack of fuel.[7] A special air-sea rescue version, the Z.506S Soccorso, was produced; it was used in small numbers by the Luftwaffe.
When Italy entered the war, on 10 June 1940, 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.[8] These units suffered severe losses as many Allied pilots did not stop attacking their aircraft 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 CANT. 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."[9]
A Cant 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).[1][10]
When Italy surrendered to Allied, on 8 September 1943, about 70 Cant 506s were still in service with Italian Navy.[11] Some surviving aircraft served with the Italian Co-Belligerent Air Force. The Germans soon captured the 506 and started using them in Italy, Germany, France, Yugoslavia and even on Greek islands and in Poland.[11] The Cant of 171a Squadriglia kept on operating air/sea rescue and patrol missions from the military port of Toulon, with mixed Italian/German crews. Some 506s captured by Germans, flown by Italian volunteer crews, operated in 1944 on the Baltic sea, patrolling the area around Peenemunde.[12] Some examples survived in postwar service until 1959.
Data from The Encyclopedia of Weapons of World War II[14]
General characteristics
Performance
Armament
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