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The Yakovlev Yak-18T is a four or five seat fully aerobatic utility aircraft. Introduced to train Aeroflot pilots, it has gained some popularity as a sportplane both inside and outside the former USSR. It is powered by a 268-298 kW (360-400 hp) Vedeneyev M14P radial engine, and is designed for stresses of +6.48/-3.24 g. (Source Wikipedia)