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