Patent ID: 9617013
Date: 2017-04-11
CPC Classifications: B64C,B64D

Claim:
1. A fuselage structure for a rotorcraft extending longitudinally from the front to the rear of the rotorcraft and made up of load-bearing stiffener members and a load-bearing covering, the stiffener members comprising load-bearing transverse frames locally defining a transverse profile of the fuselage structure, and load-bearing longitudinal stiffeners, the fuselage structure having a middle segment longitudinally interposed between a cockpit and a tail boom carrying an anti-torque device, a load-bearing top floor being securely engaged with at least two of the frames, referred to as middle frames and incorporated in the middle segment of the fuselage structure, the top floor providing a top wall of the fuselage and constituting a member for installing at least a substantially vertical axis main rotor of the rotorcraft on the fuselage structure, the fuselage structure being fitted with partitioning structures defining a plurality of compartments in the inside volume of the fuselage, including at least one top compartment having a cabin space function, and at least one bottom compartment having an equipment space function, the top compartment and the bottom compartment being separated from each other by a middle floor arranged vertically between the top compartment and the bottom compartment, the fuselage structure having the top floor overlying the middle floor at least in part, the middle floor providing via its top face a loading plane in the top compartment, wherein the middle floor is secured with at least the middle frames by forming a load-bearing floor, the bottom compartment being free of the covering on a bottom face of the fuselage structure, the middle floor being made up of reinforced panels carried by stiffener members forming load-bearing cross-members and load-bearing longerons of the fuselage structure, the reinforced panels being secured to the load-bearing cross-members and load-being longerons, the fuselage structure having a bottom face that is open to the outside by providing an open bottom for the bottom compartment leading to the outside of the fuselage structure.