FIELD: aircraft engineering and space technology. SUBSTANCE: profile of the lower part of a fuselage surface in the plane of its main buttock is made along three adjacent arcs of curves 5, 6 and 7 which have common tangents at the mating points. The convexity of first from the fuselage nose arc 5 is directed up, the convexity of intermediate arc 6 is directed down, and the convexity of third arc 7 is also directed up. The surface profile of nose part 1 of the fuselage is made in the form of these curves which have sections of straight lines and which are adjacent arcs of piece-smooth curves. EFFECT: improved flight performance and simplified technological effectiveness. 2 cl, 5 dwg
