An airflow propulsion device is coupled to the intake opening to draw {TAIL ~ the flow} through the intake opening and through a flow passage having {HEAD ~ an approximately constant flow area} 
An airflow propulsion device is coupled to the intake opening to draw { TAIL ~ the flow } through the intake opening and through a flow passage having { HEAD ~ an approximately constant flow area }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD