One of the last production versions of the aerobatic Zlin Trener was the Z-526, first flown in 1965. It was an improved Z-326 with increased useful load and an Avia V503 propeller. There was also a single-seat version, the Akrobat, for competition aerobatics. More that 300 of the Z-526 were built with the 160 hp Walter Minor 6 or 180 hp Avia M-137A.