Sikorsky S-4
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Sikorsky S-4

The S-4 was shown in an aeronautical exhibition at Kharkov in the spring of 1911 and then dismantled. Research suggests that it was the S-3 rebuilt following the accident on 13 December 1910, and that it was retired when the S-5 began to show its potential. Wing span was 9m, length 8m and loaded weight 360kg.

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