A propulsor system is {HEAD ~ an assembly} of {TAIL ~ individual propulsors} that act in concert to form a substantially continuous control surface that undulates in a working fluid 
A propulsor system is { HEAD ~ an assembly } of { TAIL ~ individual propulsors } that act in concert to form a substantially continuous control surface that undulates in a working fluid
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH