Ikarus 451 - research aircraft

Ikarus 451M by Aleksandar Mladenovic (Aeropoxy 1/72)

The designation Ikarus 451 covers a family of six research aircraft designs built in Yugoslavia in the 1950s, all sharing the same basic airframe, but otherwise quite different from each other.

Ikarus 453MW Plane-Encyclopedia

The First Yugoslavian Jet Aircraft - Ikarus 451

Flight of the Yugoslav Ikarus – Part II – Aces Flying High

The Aeronautical Museum of Belgrade - SightRaider

Ikarus 451 - Serbian prototype plane from '50s by marinbgd on DeviantArt

Flight of the Yugoslav Ikarus – Part II – Aces Flying High

Yugoslavia Plane-Encyclopedia

Flight of the Yugoslav Ikarus – Part I – Aces Flying High

Flight of the Yugoslav Ikarus – Part II – Aces Flying High