The Yak-7U was developed as a trainer version of the Yak-1. A second cockpit was added after the original one, and wing span increased. It was found that the extra space for the second cockpit could be used for fuel or armament too, and that the performance of the Yak-7 almost equaled that of the Yak-1. Thus the Yak-7 was again developed to a close support fighter.
The two-seat version was also used in combat, for reconnaissance missions. 6399
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