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The P.Z.L. 27 was a prototype airliner/mail plane designed by Zbysław Ciołkosz and constructed at P.Z.L. in 1933.
==Design and development== Ordered by the Polish Ministry of Transport as a fast mail-plane, the prototype flew for the first time in September 1933 and was the first P.Z.L. aircraft with a retractable landing gear. Several tests made at the Institute of Aviation in 1935–1936 showed that the plane had poor performance and was uneconomical to operate.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).