Patent ID: 8181901

Claim:
A hybrid helicopter having a long range and a high forward speed, the helicopter comprising: an airframe made up of: a fuselage; a lift-providing surface secured to the fuselage; and stabilizing and maneuvering surfaces, namely for pitch: a horizontal stabilizer with at least one pitch control surface that is movable relative to a front portion of the stabilizer; and for steering: at least one suitable stabilizer; and an integrated drive system constituted by: a mechanical interconnection system between firstly a rotor of radius (R) with collective pitch and cyclic pitch control of the blades of said rotor, and secondly at least one propeller with collective pitch control of the blades of said propeller; and at least one turbine engine driving the mechanical interconnection system; wherein the outlet rotational speeds of said at least one turbine engine, of said at least one propeller, of said rotor, and of said mechanical interconnection system are proportional to one another regardless of the flight configuration of the hybrid helicopter under normal operating conditions of the integrated drive system such that the rotational speed of the rotor varies in relation to the rotational speed of the at least one turbine, and the rotational speed of the at least one propeller varies in relation to the rotational speed of the at least one turbine.