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Works on the "Objects 4302 and 4303" started in 1944, when I.F.Florov was assigned a position of the Aircraft Department N°43 Head at NII-1. Those experimental planes were intended for transsonic speed trials at high altitude.
Aircraft were of all-metal construction. Maximum diameter of cigar-shaped fuselage was 1150mm. Towing hook was installed under the nose. The wing had thickness 13% and laminar flow profile (TsAGI, Svischev). Its tips had 45° dihedral to improve aircraft stability.