The PWS-51 was a Polish sports plane of 1930, a single-engine low-wing monoplane, constructed by the Podlaska Wytwórnia Samolotów (PWS), that remained a prototype.
==Design and development== The plane was designed in 1929 by Stanisław Cywiński in Podlaska Wytwórnia Samolotów, on factory's initiative, specially to participate in the Challenge 1930 international touring aircraft contest (along with PWS-50, PWS-52 and PWS-8). The plane was built with a financial help of LOPP organization and it was first flown in spring of 1930 by Franciszek Rutkowski in Biała Podlaska. It's noteworthy, that it was only 10 kg heavier, and its maximum speed was 15 km/h higher, than estimated.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).