The PZL P.11 was designed by Zygmunt Pulawski. The P.11 was based on the PZL P.7 fighter that was first developed in 1930.
The cockpit was small, unarmored, and only provided a small windscreen.
The first engine used in the P.11 was the Gnome-Rhône radial. This was replaced by a license built British Mercury VIS.
The fixed undercarriage of the P.11 was fixed, but very strong.
The tail was a spring loaded skid.
The high parasol wing was innovative when it came into production. This allowed the P.11 pilots to outmaneuver the less agile German aircraft.