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