Editing Polikarpov Po-2 (section)

==Variants==
* '''U-2''': Basic model, built in large numbers as a two-seat primary trainer. It was also built in many different versions, both as civil and military aircraft. The U-2 variants also included a light transport, utility, reconnaissance and training aircraft. Power plant was the M-11 radial piston engine of 75&nbsp;kW (100&nbsp;hp). Later models were also equipped with uprated M-11 engines of 111&nbsp;kW (150&nbsp;hp). Some aircraft were fitted with a rear closed cabin, other were fitted with sledges or floats.
* '''U-2A''': Two-seat agricultural crop dusting aircraft, powered by an 86&nbsp;kW (115&nbsp;hp) M-11K radial piston engine. Later redesignated '''Po-2A''' after 1944.<ref name="Smith" />
* '''U-2AO''': Two-seat agricultural aircraft.
* '''U-2AP''': [[Agricultural aircraft]], with a rear cab replaced with a container for 200–250&nbsp;kg (441-551&nbsp;lb) of chemicals. 1,235 were built in 1930–1940.
* '''U-2G''': This experimental aircraft had all the controls linked to the control column. One aircraft only.<ref name="Smith" />
* '''U-2KL''': Two aircraft fitted with a bulged canopy over the rear cabin.<ref name="Smith" />
* '''U-2LSh''': Two-seat ground-attack, close-support aircraft. The aircraft were armed with one 7.62&nbsp;mm (0.30&nbsp;in) [[ShKAS machine-gun]] in the rear cockpit. It could also carry up to 120&nbsp;kg (265&nbsp;lb) of bombs and(or?) four [[RS-82]] rockets. Also known as the '''U-2VOM-1'''.
* '''U-2LPL''': Experimental prone-pilot research aircraft.<ref name="Smith" />
* '''U-2M''': This floatplane version was fitted with a large central float and two small stabilizing floats. Not built in large numbers. Also known as the '''MU-2'''.<ref name="Smith" />
* '''U-2NAK''': Two-seat night artillery observation with observer's cabin fully equipped with radios.<ref name="Smith" /> Also used for reconnaissance. Built from 1943.
* '''U-2P''': [[Floatplane]] version, built only in limited numbers, in several variants with different designations.
* '''U-2S''': [[Air ambulance]] version, built from 1934. It could take a physician and an injured on a [[stretcher]] on a rear fuselage, under a cover. Variant '''U-2S-1''' from 1939 had a raised fuselage top upon the stretcher. From 1941 there were also used two containers for stretchers, that could be fitted over lower wings or two containers for two seating injured each, fitted under lower wings.<ref name="Smith" />
* '''U-2SS''': Air ambulance aircraft.
* '''U-2ShS''': Staff liaison version, built from 1943. It had a wider fuselage and a closed 4-place rear cab.
* '''U-2SP''': Civil transport version, could carry two passengers in open individual cabs, built from 1933. Other roles included aerial survey, and aerial photography. A total of 861 were built between 1934 and 1939.<ref name="Smith" />
* '''U-2SPL''': This limousine version was fitted with rear cabin for two passengers.
* '''U-2UT''': Two-seat training aircraft, powered by an 86&nbsp;kW (115&nbsp;hp) M-11D radial piston engine. Built in limited numbers.
* '''U-2LNB''': Somewhat like the earlier '''-LSh''' version, a Soviet Air Force two-seat night attack version, built from 1942. Armed with one 7.62&nbsp;mm (0.30&nbsp;in) ShKAS for rear defense, plus up to 250&nbsp;kg of bombs under the wings for land support. Earlier aircraft were converted to improvised bombers from 1941.
* '''U-2VS''' : Two-seat training and utility aircraft. Later redesignated '''Po-2VS''' after 1944.
* '''U-3''': Improved flying training model, fitted a 149&nbsp;kW (200&nbsp;hp) seven cylinder M-48 radial engine.<ref name="Smith" />
* '''U-4''': Cleaned-up version with slimmer fuselage; not built in large numbers.
*- (Total U-2 manufacture: 33,000)
*'''Po-2''': Postwar basic trainer variant.
*'''Po-2A''': Postwar agricultural variant.
*'''Po-2GN''': "Voice from the sky" propaganda aircraft, fitted with a loud speaker.<ref name="Smith" />
*'''Po-2L''' : Limousine version with an enclosed passenger cabin.
*'''Po-2P''' : Postwar floatplane version; built in small numbers.
*'''Po-2S''': Postwar air ambulance variant, with a closed rear cab.
*'''Po-2S-1''': Postwar ambulance version, similar to the pre-war U-2S.
*'''Po-2S-2''': Postwar ambulance version, powered by a M-11D radial piston engine.
*'''Po-2S-3''': Postwar ambulance version, which had two underwing containers, each one was designed to transport one stretcher patient. Also known as the '''Po-2SKF'''.
*'''Po-2ShS''': Staff communications aircraft, fitted with an enclosed cabin for the pilot and two or three passengers.
*'''Po-2SP''': Postwar aerial photography, geographic survey aircraft.
*'''Po-2W''': Yugoslav modification powered by {{convert|160|hp|kW|abbr=on}} license-built [[Walter Minor|Walter Minor 6-III]] engine. 62 modified by [[Utva Aviation Industry|Utva]] 1958–59.<ref>''Air-Britain Archive'' Spring 2017, p. 4</ref>
*'''RV-23''': This floatplane version of the U-2 was built in 1937. It was used in a number of seaplane altitude record attempts. The RV-23 was powered by a 529&nbsp;kW (710&nbsp;hp) [[Wright R-1820]]-F3 Cyclone radial piston engine.
* '''CSS-13''': Polish licence version, built in Poland in [[Państwowe Zakłady Lotnicze|WSK-Okęcie]] and [[PZL-Mielec|WSK-Mielec]] after World War II (about 500 built in 1948–1956).<ref name="Smith" />
* '''CSS S-13''': Polish ambulance version with a closed rear cab and cockpit and Townend ring (53 built in [[Państwowe Zakłady Lotnicze|WSK-Okęcie]] in 1954–1955, 38 converted to S-13).<ref name="Smith" />
* '''E-23''': Research version, built in the Soviet Union in 1934, for research into inverted flight.<ref name="Smith" />