Arado SD II


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Arado SD II

Larger and substantially heavier than the preceding SD I, and utilising a more conventional unequal-span biplane wing cellule with N-type interplane struts and flying wires, the SD II was designed by Ing Walter Rethel and a sole prototype was completed in 1929 as a competitor for the HD 37, a second airframe becoming the SD III. Of mixed construction, with fabric-covered wooden wings and a welded steel-tube fuselage, the SD II was powered by a geared Siemens und Halske-built Jupiter VI nine-cylinder radial, which, with a maximum rating of 530hp, drove a large-diameter, slow-running three-bladed propeller requiring a high angle of attack on the ground. Armament remained two 7.9mm synchronised 08/15 machine guns. The SD II demonstrated rather difficult flying characteristics, but, together with the SD III, provided a basis for the series-production Ar 64.

  Take-off weight1770 kg3902 lb
  Empty weight1445 kg3186 lb
  Wingspan9.90 m33 ft 6 in
  Length7.40 m24 ft 3 in
  Wing area23.00 m2247.57 sq ft
  Max. speed235 km/h146 mph

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