This tiny aircraft was the first jet-powered of yugoslav design. Conceived by Dragoljub Beslin, it employed the basic airframe of his previous piston-engined Ikarus 451 but with a more orthodox cockpit configuration. The piston engines were replaced by a pair of Turbomeca Palas turbojets in underslung nacelles. So configured the 451M made its maiden flight in late 1952. Its national milestone apart, this aircraft served to gather technical data; the design saw further development.
Definitely toy-like, specially compared to those already vintage Yak-9Ms.