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the Yakovlev Yak-45 was the designation for a series of design studies in 1973-1974 for a single-seat fighter. It lost to the Mikoyan MiG-29.
Yak-45 was a twin-engine single midwing normal aerodynamic configuration with a single vertical tail and bicycle landing gear. Engines were located in almost half the wingspan, the two main wing spar in this place took the form of half-ring motors covering the bottom. This arrangement gave certain advantages. First, this arrangement greatly increased engine durability machine, reducing the chance of damage to both of the two motors. Second, simplify maintenance, opening the approach to engines with virtually any party. In addition, simply solved issues replacement engines. There were also the aerodynamic advantages: it reduces the loss of inlet air intakes and at the nozzle exit.

Design and development

In the early 1970s the Soviet VVS expressed a desire to replace the MiG-21 with a more modern twin-engine fighter with greater air-superiority capabilities. Yakovlev's entry was a series of designs submitted under the designation Yak-45.
The Yak-45 would have been powered by two Favorski Type 69 non-vectoring turbofan engines with afterburners. Derived from the R-28, they were rated at 8,000 kg (17,635 lb) thrust each. The engines would have been positioned ahead of a large delta wing, with an additional large canard foreplane, giving the aircraft an appearance similar to the Saab Viggen.

The design was rejected in favor of the MiG-29.

In 1978-1979 Yakovlev attempted to restart development of the Yak-45 by designing a V/STOL version with two vectoring-thrust nozzles and two RD-38 jets. This aircraft was not developed because the problem of roll associated with the loss of one engine during VTOL operation was never solved.