with hydraulic controls and an all-metal rotor. Mi-1MNKh Four-seat general-purpose utility helicopter, basing on Mi-1M. Designed to be used as an agricultural aircraft, air ambulance, passenger transport, air mail, freight transport helicopter (NKh—narodnoye khozyastvo—National Economy). Mi-1MG Float-equipped version of the Mi-1M for whaling ships, of 1958 (2 made). Mi-1MRK Prototype of a liaison helicopter, basing on Mi-1M (razvedyvatelno-korrektirovochnoi—reconnaissance-artillery correcting), tested in 1960-1962. Mi-1MU Prototype of an armed variant, tested from 1961, with four 3M11 Falanga (AT-2) or six 9M14 Malyutka (AT-3) anti-tank missiles. SM-1 (SM-1/300) Polish production version, powered by a LiT-3 radial piston engine. The Mil Mi-1 helicopter built by WSK PZL-Świdnik under licence in Poland. SM-1/600 Polish production version with increased reliability of 600 hours, of 1957 (factory designation). SM-1Sz Dual-control training helicopter. SM-1W Polish production version of the Mi-1M, of 1960. SM-1Wb Polish production version of the Mi-1M, of 1963, with increased reliability of 800 hours (factory designation). SM-1WS Air ambulance helicopter. SM-1WSz Dual-control training helicopter. SM-1WZ Agricultural helicopter. SM-2 Improved Polish version with a stretched fuselage, seating a pilot and four passengers. Mi-3 Improved version with four bladed main rotor. Designation reused for a planned Mi-2 derivative. Operators Afghan Air Force Albanian Air Force Algerian Air Force Bulgaria Bulgarian Air Force People's Liberation Army Air Force Cuban Air Force Czechoslovakian Air Force East German Air Force Egyptian Air Force Finnish Air Force Hungary Hungarian Air Force Indonesian Air Force Iraqi Air Force Mongolian Air Force North Korean Air Force Poland Polish Air Force Socialist Republic of Romania Romanian Air Force Aeroflot Soviet Air Force Syrian Air Force UAR Air Force North Vietnamese Air Force Yemeni Air Force Specifications (Mil Mi-1) See also References Grzegorzewski, Jerzy: Śmigłowiec Mi-1, Typy Broni i Uzbrojenia nr.38, MON, Warsaw, 1975 Mil External links Drawings of Mi-1 variants Walkaround Mi-1 (Kiev's Aviation Museum, Ukraine) Mi-01 Mil aircraft 1940s Soviet military utility aircraft 1940s Soviet helicopters Single-engined piston helicopters Aircraft first flown in 1948