For an arrangement of {HEAD ~ the elastic elements} substantially radially outside of {TAIL ~ the impeller wheel}, the first driving device extends beyond this impeller wheel 
substantially radially outside of
For an arrangement of { HEAD ~ the elastic elements } substantially radially outside of { TAIL ~ the impeller wheel } , the first driving device extends beyond this impeller wheel
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH