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