A replaceable unit in accordance 26, wherein {HEAD ~ the integral rotor} has {TAIL ~ a ring shaped rotor disc} in which electromagnetically active components of the integral rotor are accommodated and to which rotor blades are fastened 
A replaceable unit in accordance 26 , wherein { HEAD ~ the integral rotor } has { TAIL ~ a ring shaped rotor disc } in which electromagnetically active components of the integral rotor are accommodated and to which rotor blades are fastened
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH