;Aerokopter ZA-6 San'ka:Original design forming the basis of the AK1, with a five-bladed main rotor and powered by a
Subaru EJ22 converted automobile engine. ;Aerokopter AK1-5:A development prototype modified from a ZA-6 with a five-bladed main rotor. Registered as GL-0478 and displayed at the 2002
Kyiv Manufacturing and Security Exhibition. ;Aerokopter AK1-3:A second stage of development resulted in the AK1-3 with a three-bladed rotor, (also displayed incomplete at the 2002 Kyiv exhibition). Other changes included a tailplane with end-plate fins and tail rotor transferred to the right side of the tail boom. ==Specifications (AK1-3) ==