Method for assisted piloting of a rotary wing aircraft comprising at least one screw propeller, assisted piloting device and aircraft

The method involves transforming an acceleration setpoint by predetermined relationships into a required longitudinal attitude setpoint that is transmitted to an automatic system (26). The acceleration setpoint is transmitted into a required load factor setpoint in a longitudinal direction of an aircraft (1) parallel to a roll axis of the aircraft, where the load factor setpoint is transmitted to another automatic system (25) for maintaining the load point by controlling a collective pitch of a set of blades (2') of a propulsion unit to comply with the former setpoint. An independent claim is also included for a device for assisting piloting of a rotary wing aircraft i.e. hybrid aircraft.