Originally posted by Karnak
Yak-3 is a development of Yak-1.
Yak-7 is a devolpment of Yak-1 and Yak-9 is a development of Yak-7.
I think Yakolev started working on the Yak-3 before the Yak-7 or 9.
Yak1 > Yak1M >Yak3
Yak1> Yak1 Trainer> Yak7 > Yak 9 B/D/DD/T/M
Yak1M & Yak 9T > Yak9U
The Yak 1M was preceded by a development plane that was to be called the Yak 3 but never was (sort of). Yak1M as a project drifted over 1943 such that the Yak 3 was not in production until late spring 44
Yak 7 was in production in 42 and the Yak9D & T were in production in 43