After designing the P.7, Puławski started to develop his design with more powerful engines, and the result was the PZL P.11, built in a production series. Puławski was an inline engine fan, designing a new fighter, the P.8, with a slim silhouette, powered with an inline engine. It was able to reach a speed of 350 km/h. A planned variant was to be designated the P.9. Unfortunately, in March 1931, Puławski died in an air crash, and the inline engine fighter design was cancelled in favour of the radial engined P.11. The P.11 became the standard Polish fighter. In parallel with the P.11, the PZL P.24 export variant was also developed in 1932.