In 1959 the VVS held a competition
for a light jet trainer, able to be used
for ab mitio instruction. Such aircraft
had never been developed in the Soviet
Union, the only jet trainers being conversions
of powerful military types.
Yakovlev 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.
Bill Gunston & Yefim Gordon "Yakovlev Aircraft since 1924", 1997