The Yakovlev Yak-4 was based on the Yak-2 and was to be used for ground attack and light bombing. Aleksandr Sergeievich Yakovlev was the desinger.
The Yak-4 was made from wood and metal.
The wings were low in the fuselage.
Once it was shown that the Yak-4 was more vulnerable than the Il-2, starting in 1942 the Yak-4s were used for reconnaissance at high altitudes.