WSK An-2R

The most numerous was the agricultural version (7,880 units). Together with those produced in the USSR and China, it is the most numerous type of agricultural aircraft in the world. The main recipient of Polish-built An-2s was the USSR (10,628 units), while 464 units were operated in Poland.
The An-2 is a single-engine biplane of metal construction with fixed landing gear. The wings and tail surfaces are fabric-covered. The upper wings have automatic slats, and both wings have landing flaps. Metal fuel tanks with a total capacity of 1,200 l are located in the upper wings. The central section of the fuselage has a cargo compartment, where in the agricultural version a chemical tank is installed. The fuselage doors are double; smaller ones for the crew and passengers, and larger ones, opening outward, for loading cargo. The cockpit has dual controls. The wheels can be replaced with skis, or floats can be installed for the seaplane version.

The powerplant consists of a 9-cylinder radial engine, Ash-62IR, rated at 1000 hp (736 kW), and a metal variable-pitch AW-2 propeller with a diameter of 3.6 m. The main common component of the agricultural equipment is the chemical tank. It is made of epoxy laminate reinforced with glass fibre and has a capacity of 1,350 l. In the dry fertilizer version, a tunnel spreader was mounted under the aircraft beneath the tank throat, and above the tank there were 2 loading channels for fertilizers and a windmill-driven agitator inside the tank. In the liquid spraying version, a pumping unit equipped with a centrifugal pump driven by a windmill and pneumatically operated valves controlling the flow of liquid to the spray bars was mounted at the tank throat. The spray bars were suspended under the fuselage and lower wing. Up to 96 spray nozzles of various types and sizes could be installed on the bars. For ultra-low volume (ULV) spraying, rotary atomizers on booms were mounted under the wings.