Patent ID: 8308108

Claim:
An aircraft fuselage elongated along a longitudinal axis of an aircraft that determines a direction toward a front of the aircraft along a direction of motion of the aircraft in flight, comprising: a front part with straight cross sections widening relative to the longitudinal axis, said front part ending in front with a fuselage nose and being delimited at a rear by a joining cross section similar to a cross section of a rear part, essentially cylindrical of the fuselage, said front part comprising a cockpit located above a floorboard between a cockpit bulkhead to the rear and a front wall at the front, wherein lower shapes of a working structure of the front part determine a lower bulge such that each straight cross section of the working structure of the fuselage has a single curvature rounded shape and such that a lower profile of the working structure of the fuselage, corresponding to an intersection between a vertical plane of symmetry of the aircraft and an exterior surface of the fuselage comprises: a simple curvature between the fuselage nose and the cockpit bulkhead, and curvature inversion between the cockpit bulkhead and the joining cross section so that the lower profile has a local extremum at the bottom, said local extremum determining an intermediate cross section between the said cockpit bulkhead and the said joining cross section, and wherein upper shapes of the front part determine an upper profile of the fuselage said upper profile, between the fuselage nose and the intermediate cross section, having a simple curvature and being essentially symmetrical, with respect to an axis parallel to the longitudinal axis and passing through the fuselage nose, imparting a general ovoid shape to the fuselage in front of the lower bulge.