Yakolev Yak-30 
In 1959 the VVS held a competition for a light jet trainer, able to be used for ab initio instruction. Such aircraft had never been developed in the Soviet Union, the only jet trainers being conversions of powerful military types. Yakolev produced a prototype, with the Service designation Yak-30. In parallel, funded by DOSAAF, the OKB produced a single-seat version, the Yak-32. Surprisingly, the only competitors came from outside the Soviet Union.
The contest for a jet trainer resolved itself in 1960 into a three-pronged evaluation, the rivals being the Czechoslovak L-29 Delfin and the Polish TS-11 Iskra. The TS-11 was soon eliminated and sent back to Poland, and a head-to- head developed in which the Yak-30 showed an edge in performance, but was marred by detail problems. In any case Czechoslovakia needed the work, and so the L-29 was chosen in August 1961 as the trainer for all Warsaw Pact air forces except Poland's.
NATO code MANTIS.
Engine: 1 x Tumanskii TRD-29 turbojet, 1,764-2,315 lbs.t. (800-1050kgp)
Cruise, 350 mph (563 kph)
Service ceiling, 40,000 ft (12192 m)
Engine: 1 x turbo-jet RU-19, 8.8kN
Max take-off weight: 2250 kg / 4960 lb
Empty weight: 1555 kg / 3428 lb
Wingspan: 9.38 m / 31 ft 9 in
Length: 10.14 m / 33 ft 3 in
Wing area: 14.3 sq.m / 153.92 sq ft
Max. speed: 767 km/h / 477 mph
Ceiling: 16100 m / 52800 ft
Range: 965 km / 600 miles