Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Yakovlev Yak-18 was a Soviet tandem two-seat military primary trainer aircraft. Originally powered by one 119 kW (160 hp) Shvetsov M-11FR-1 radial piston engine, it entered service in 1946. It is also produced in China as the Nanchang CJ-5. A member of the second generation of Russian aircraft designers, and best known for fighter designs, Alexander Sergeyevich Yakovlev always retained a light aircraft design section. In May 1945, Yakovlev initiated design of the Yak-18 two-seat primary trainer. He designed it to replace the earlier Yakovlev UT-2 and Yak-5 in service with the Soviet Air Forces and DOSAAF (Voluntary Society for Collaboration with the Army, Air Force and Navy, which sponsored aero clubs throughout the USSR).