Between 1947 and 1948, the test pilot and aeronautical constructor Alexei Ivanovich Pietsuj developed two new projects at the MAI that were called PAI-5 and PAI-6. The Pietsuj PAI-5 (Russian: Пьецух ПАИ-5) was designed as a single-seater competition glider and was built at the GK NII VVS experimental factory in 1947.
The PAI-5 was designed as a high cantilever glider with a small trapezoidal wing.
The glider was built entirely of wood. The fuselage had a simple construction made up of a series of frames joined by four stringers. The outer covering was made with plywood. The wings had an R-Sh profile. The wingtips were covered with plywood and the rest with paint coated fabric.
The horizontal tail plane was raised to the top line of the fuselage and positioned in front of the vertical empennage.
The landing was made on a wooden ski, with a trunk structure, located in the lower part of the fuselage.
The cockpit, located in front of the wing, was closed by a cover that protruded from the upper line of the aircraft.
The PAI-5 glider was tested in February 1948. Pietsuj himself flew the model in front of a group of renowned test pilots, most notably Air Marshal Ye. During the test flight the complete set of high school aerobatics was executed and an overload of 8g was achieved at speeds of 220 km / h.
During the celebration of Air Fleet Day in 1948 Pietsuj made a demonstration of high school piloting. For the design and construction of this glider AI Pietsuj received the Order of the Red Star.
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