The Działowski Bydgoszczanka, named after Bydgoszcz, the city where it was built in 1925, was a Polish glider designed to compete in the Second National Gliding Contest.
Czarna Góra did not provide the wind speeds needed for the First Polish Glider Contest, held in 1923.
The frame was made by gluing together long strips of wood which were then bent back on themselves and fixed in shape with five vertical bracing members and cross-wires.
The Bydgoszczanka'a broad-chord ailerons, which could be operated together or differentially, merged into full-span, rotating wingtips which acted as aerodynamic balances.
Cynk and Glass agree that the modification was made during the repair of damage caused by a crash during the contest but not on which form came first.