[7] The pilot sat in front of the wing, and was enclosed in a simple U-shaped wooden fairing that was removed by sliding it forward to allow him or her to enter and leave the aircraft.

[10] The ultimate development in the line were gliders intended for towed flight (designated Б, 'B), which shared the longer wings and streamlined fairing of the P-types, but added a canopy to enclose the cockpit.

Therefore, one copy of each aircraft model procured from the USSR were divided, each part was measured, and technical drawings were made.

This practice of construction (reverse engineering) was also used later by Nuri Demirag, by the Turkish Aeronautical Association (THK) and by the Mechanical and Chemical Industries Corporation (MKEK).Kayseri Tayyare Fabrikasi produced at least 11 copies of Ps-4.

[11] THK and Makina ve Kimya Endüstrisi Kurumu (MKE, MKEK) produced dozens of the THK-4 (A-1, U-s4), THK-7 (A-2, P-s2) and MKEK-6 (A-2, P-s2), which was used for Turkish military pilots training.