 The new fighter was designated I-5 ("Istrebitel"—Fighter), but had the internal Tupolev designation of ANT-12.Concurrently, Nikolai Nikolaevich Polikarpov's group was tasked with creating a wood-construction aircraft designated as the Polikarpov I-6 to the same specification.The I-5 design, begun by Pavel Sukhoi, under the supervision of Andrei Tupolev, lagged because the Tupolev bureau was preoccupied with large bombers.