The PZL P.7 was a Polish fighter aircraft designed in the early 1930s at the PZL factory in Warsaw. It was the main fighter of the Polish Air Force between 1933 and 1935. The PZL P.7 was replaced in Polish service by its follow-up design, the PZL P.11c. More than 30 PZL P.7 fighters remained in service during the Invasion of Poland, scoring several kills despite its obsolescence.The history of the PZL P.7 began in 1928, when a talented designer named Zygmunt Puławski designed an all-metal, metal-covered monoplane fighter, the PZL P.1. It introduced a high gull wing, giving a pilot an optimal view. The wing design was called the "Polish wing" or "Pulawski wing." The P.1 was powered by an inline engine and developed a speed of 302 km/h (188 mph). But it remained a prototype because a decision was made to use a licence-produced radial engine in the Polish Air Force fighters. So the next model, the PZL P.6, flown in August 1930, was powered by the Bristol Jupiter VI FH radial engine. Both aircraft were well received in the aviation world, with the press recognizing the P.6 as one of the world's top fighters; it won the American National Air Races in August–September 1931.