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