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Sikorsky S-5

The S-3, S-4, and S-5 followed in quick succession, each a refinement of its predecessor, and each adding to Sikorskys’ piloting experience.

Finally, by the summer of 1911, in an S-5 with a 50-horsepower engine, Sikorsky was able to remain in the air for more than an hour, attain altitudes of 1,500 feet (450 metres), and make short cross-country flights. This success earned him International Pilot's License Number 64.



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