 In 1949 the Yak-20 was designed by the Yakovlev OKB for use with aviation clubs as a trainer and sport aircraft.Intended to be the cheapest modern aircraft that could serve as a useful pilot trainer and aerobatic sport aircraft, the Yak-20 was intended to be considerably cheaper to build and operate than the contemporary Yak-18.Though structurally similar to the Yak-18, the Yak-20 had a welded steel tube fuselage which was skinned with aluminium alloy sheet and fabric, with aluminium alloy wings, skinned in metal back to the single spar, and fabric aft of the spar.