A rotorcraft comprising flight controls , at least one rotor , and an apparatus for transmitting a mechanical control signal between the flight controls and the at least one rotor , the apparatus comprising: a flexible kinematics element that has a longitudinal axis and comprises: a conduit , and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a control signal transmitter that transmits the mechanical control signal; and an interface element that is coupled between the linear control signal conveyor and the control signal transmitter and comprises: a first lever that is connected to the control signal transmitter and rotates around a first axis , a second lever that rotates around a second axis that is different than and parallel to the first axis , and an interconnecting element with a first attachment , a second attachment , and a third attachment , wherein the first attachment is connected to the first lever , the second attachment is connected to the second lever , and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element , characterized in that : the third attachment is equidistant from the first attachment and the second attachment , and the first axis of the first lever and the second axis of the second lever are on opposite sides of the longitudinal axis of the flexible kinematics element . a flexible kinematics element that has a longitudinal axis and comprises: a conduit , and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a conduit , and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a control signal transmitter that transmits the mechanical control signal; and an interface element that is coupled between the linear control signal conveyor and the control signal transmitter and comprises: a first lever that is connected to the control signal transmitter and rotates around a first axis , a second lever that rotates around a second axis that is different than and parallel to the first axis , and an interconnecting element with a first attachment , a second attachment , and a third attachment , wherein the first attachment is connected to the first lever , the second attachment is connected to the second lever , and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element , a first lever that is connected to the control signal transmitter and rotates around a first axis , a second lever that rotates around a second axis that is different than and parallel to the first axis , and an interconnecting element with a first attachment , a second attachment , and a third attachment , wherein the first attachment is connected to the first lever , the second attachment is connected to the second lever , and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element , characterized in that : the third attachment is equidistant from the first attachment and the second attachment , and the first axis of the first lever and the second axis of the second lever are on opposite sides of the longitudinal axis of the flexible kinematics element . <EOS>