{TAIL ~ Each propulsor} is driven and configured by {HEAD ~ computer controlled actuators} so that the control surface undulates in various wave forms 
{ TAIL ~ Each propulsor } is driven and configured by { HEAD ~ computer controlled actuators } so that the control surface undulates in various wave forms
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH