Walter Rethel, Arado's chief designer, began its design back in 1931 looking for a new two-seat trainer. However, Rethel was hired by Messerschmitt and Walter Blume had to continue with the project. The first prototype, named Arado Ar.66a flew for the first time in 1932.
The Ar.66 was powered through all its variants by a single Argus As.10 air-cooled inverted V8 engine which yielded around 240 hp of power and drove a two-bladed propeller.
The fuselage had an oval cross-section and was entirely made of welded steel-tubes, covered in fabric. The double wings provided very high lift, also at low speeds. Both wings had the same span and were turned 8º backwards. It was made out of a double pine wing spar structure, with lime tree ribs and fabric covering. Both wings were fitted with ailerons and the tail was of conventional design with horizontal stabilizers mounted on the fuselage upper edge. the rudder was placed behind the elevators and both of them were made out of steel tube covered in fabric. These were one of the few changes that were made to the prototype, to make them bigger, since it presented balance problems. The undercarriage was welded to the fuselage in a "V" shape and used high-pressure rubber suspension.
The crew consisted in two, a pilot and a trainee, seated in open tandem cockpits, equipped with dual controls. The aircraft was equipped with instrument flight systems with photographic cameras mounted as optional equipment.
There were three versions, the Ar.66a which was the first prototype, of which only a single machine was build, the Ar.66b and Ar.66B which was a floatplane variant, of which only 10 machines were completed and the Ar.66C which was the series production with modified elevators, larger rudder and larger-diameter wheels.
The Ar.66 entered service with the Reichluftfahrtministerium (Reich's Aviation Ministry) in 1933 and then with the Luftwaffe in 1934, serving as a basic and ground-attack trainer well into World War 2. In 1937, a total of six Ar.66Cs were exported to Spain, to serve with the Aviación Nacional (National Aviation) the Air Force of the Nationalist faction of the Spanish Civil War, being that the only export sale of the type.
Since 1942, it was also used as a night-harassment ground-attack aircraft in the Eastern Front, and, in that role it was equipped with a single defensive MG-15 machine gun mounted in the observer's rear position and could carry a small amount of bombs or mines, in a similar manner that the Soviets did with the Polikarpov Po-2.
They saw service, together with the Gotha Go.145, in Nachtschlacthgruppen (Night Harassment Squadrons) 2, 3 and 5 serving in the Eastern Front, Nachtschlachtgruppe 8, in Finland and Nachtschlachtgruppe 12 in the Latvian region.
During the latest stages of the War, when Romania switched sides, some Ar.66Cs were captured and pushed into service with the Romanian Air Force. Czechoslovakia also captured a bunch of those machines, as the Luftwaffe had set up many flying schools there. They were used as trainers with the newly re-built Czechoslovak Air Force during the postwar years.
Sources:
1. https://en.wikipedia.org/wiki/Arado_Ar_66
2. https://de.wikipedia.org/wiki/Arado_Ar_66 (translated)
3. http://www.airwar.ru/enc/other1/ar66.html (translated)
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