for the actuation of suitable control devices such as valves it will be appreciated that suitable sensors may also be included fig3 shows an alternative embodiment of the apparatus 1 according to the invention in this embodiment the carrier element 10 can be smaller but it again has a ball rotary joint 12 it will be appreciated that a suitable drive can be provided at the ball rotary joint 12 longitudinal bearers 28 are arranged at two opposite sides of the carrier element 10 mounted to those longitudinal bearers 28 once again at two opposite sides of the carrier element 10 is a rotor blade receiving means 17 comprising upper elements 11 side elements 14 and bottom elements 16 here the rotor blade receiving means 17 is shown as being open at one side it will be appreciated that it is also possible to provide there a pivotably mounted element which permits the rotor blade receiving means 17 to be closed at the open side so that a rotor blade see rotor blade 29 of fig2 accommodated therein is again enclosed at all four sides for the sake of clarity also the container corners see reference 20 in fig1 and the eyes see reference 26.