Siemens-Schuckert D.IV

One of the D.IIc prototypes was modified and adjusted and was sent to the front for assessment in the spring of 1918. After a few tests and further adjustments, it became the prototype for the Siemens-Schuckert D.IV. While a production order had been placed in March 1918, it was not until August that first deliveries were made to Jastas 14 and 22. While orders totaled 280 machines, probably only about fifty saw service.

In an attempt to speed up the Siemens-Schuckert D.III and reduce its cooling problems, the Siemens-Schuckert D.IV featured a reduced-chord wing and a cut-away engine cowl (which was also used on late-model D.IIIs). The D.IV attempted to increase the D.III's speed with narrow-chord wings, which reduced drag at the cost of decreased climbing capability. Though seen only in small numbers, it was probably the best German fighter at the end of the war, from a technical standpoint.

The D.IV has an unusual feature: the left wings are some 7cm longer than the right to compensate for propeller torque.

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