The coupling system may also include gearing or other drive componentry to increase or decrease the speed of the turbine relative to {HEAD ~ the speed} of {TAIL ~ fluid flow} 
of
The coupling system may also include gearing or other drive componentry to increase or decrease the speed of the turbine relative to { HEAD ~ the speed } of { TAIL ~ fluid flow }
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