The present invention generally is related to {TAIL ~ propulsion systems operable} in a fluid medium, and, more specifically, to {HEAD ~ a control system} for a traveling wave propulsion system 
The present invention generally is related to { TAIL ~ propulsion systems operable } in a fluid medium , and , more specifically , to { HEAD ~ a control system } for a traveling wave propulsion system
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH