Patent ID: 7364114

Claim:
An aircraft to carry loads, comprising: a plurality of lifting rotors and a plurality of thrust rotors; a plurality of electric motors, each motor associated with one of the rotors; a plurality of inverters, each inverter associated to one of the electric motors, to individually control each electric motor; an electric motor-operated cable winch to raise or lower external loads that can be carried by the aircraft; at least one connecting bar provided between at least two of the electric motors; a lifting cable attachable to an external load, wherein the external load is a component of a building; and a spring leg to resiliently mount a support plate to an end of each electric motor respectively associated with each lifting rotor, said support plate being remote from a shaft that connects each electric motor to their associated lifting rotor, wherein when said aircraft lands, said support plate is adapted to come into ground contact and the electric motor having said support plate resiliently mounted thereto moves downwardly against pressure of said spring leg, so as to prevent a housing of said electrical motor from being exposed to ground contact.