Ikarus 451
The Ikarus 451 is a family of research aircraft designs built in the former Yugoslavia in the 1950s by the Belgrade-based manufacturer Ikarus (now Ikarbus), all sharing the same basic airframe, but differing in powerplants and cockpit arrangements. One member of the family Ikarus 451M became the first domestically-built jet aircraft to fly in Yugoslavia on 25 October 1952.