Arado Ar 64
The Arado Ar 64 was a fighter aircraft from 1930, which was designed as a biplane. The aircraft was a further development of the Arado SD II and SD types III.
Arado SD I
The Arado SD I was the first fighter plane model, which was built by the Arado Handelsgesellschaft in Warnemünde. It was designed by Walter Rethel. It flowed a lot of experience from his previous work at Fokker. This very compact model was run in mixed construction. Unusual was the absence of tension wires. The SD I had a 425 bhp air-cooled end 9-cylinder radial engine Bristol Jupiter, which was manufactured by Gnôme et Rhône under license. The armament consisted of two synchronized 7.92 mm machine guns 08 /15 campaign. The maiden flight of the first of two prototypes built took place on 11 October 1927. There were very poor stall characteristics. Because of the very immature appearing structure, the Ministry of Defense called for a complete redesign that led to the SD II.
Arado SD II
The new design was also conducted by Walter Rethel. The SD II was larger and heavier than the SD I. The significantly more conservative interpretation had braced wings. The only prototype was completed in 1929 as a competitor to the Heinkel HD 37. As a drive manufactured by Siemens & Halske 530 hp 9-cylinder radial engine Jupiter VI served with reduction gear and a large 3 -blade propeller. The armament consisted of two synchronized 7.92 mm 08 /15 machine guns again. Despite the difficult handling the SD II formed the basis for the later Ar 64
Arado SD III
The SD III was created from the airframe of the second prototype of the SD II; She was equipped with a Siemens & Halske manufactured Jupiter VI with 510 hp and a smaller direct-drive two -blade propeller. The front contours were revised and due to the smaller propeller was a lower gear to be installed. The armament corresponded to the already built- in SD II.
Serial execution Ar 64
The Ar was 64a derived directly from the SD II and SD III, however. Terms of aerodynamics with a significantly improved hull construction, in particular by an offset further back disguised engine that otherwise the SD III corresponded The Ar 64a had a four-bladed wooden propeller. The development was triggered by a request from the Ministry of Defense for a successor to the Fokker D.XIII used in Lipetsk. The first flight of the Ar 64a took place in spring 1929.
The next two prototypes, named Ar 64b were equipped with a water-cooled V12 engine BMW VI 6.3 with a power of 640 hp. They were tested in 1931 in Lipetsk.
The Ar 64c corresponded with minor structural changes again the Ar 64a. The series production was started in parallel with the versions Ar and Ar 64d 64e. This differed from the Ar 64c by a revised tail unit and to each other mainly by the transmission ( with d, e without) and the propeller ( d with 4-blade, e with 2 -blade propeller ).
Between 1931 and 1934, 30 Ar 64 twelve of them at Focke-Wulf were built. On 1 April 1933 six Ar 64d and 64e five Ar were present. By the end of 1934, 19 Ar 64 have been delivered. This went first to the Jagdfliegerschule Schleissheim and then to the fighter squadrons of the group Doberitz. On 1 July 1936 it had 21 Ar 64 available in the Air Force. The successor was the Arado Ar 65