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