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The last attempt to improve the SOD S.IV reconnaissance aircraft was a prototype built in early 1918 by AGO Flugzeugwerke, named the C-IX.

After a mishap with the Mercedes D.IV, the designers returned again to the proven engine Benz Bz.IV.

Once again, the alterations touched the wings of the aircraft, in addition, work was done to improve the aerodynamics of the fuselage.

Like all previous attempts this failed.

The military did not accept the aircraft.

The prototype was used for some time in the company to test various engine radiators.


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