The main block of a drop power station 1, wherein {HEAD ~ the first and second rotatable elements} are {TAIL ~ wheels} having certain and different speeds of rotation and having friction disks as a connection between sub systems 
are
The main block of a drop power station 1 , wherein { HEAD ~ the first and second rotatable elements } are { TAIL ~ wheels } having certain and different speeds of rotation and having friction disks as a connection between sub systems
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH