Józef Borzęcki choose Olesno Śląskie as his place of residence. There, he designed and built the fourth ultra-light structure called JB-4 “Skowronek”.
In the fall of October 29, 1989, in the presence of Elżbieta’s daughter, “Skowronek” made several successfully completed take-offs and landings. A year later, on October 14, 1990, he made his last flight. From a height of 200 m, while descending to land, the left wing girder was broken. On this day, Józef Borzęcki died.
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