The actuator has at least one pair of {HEAD ~ wings} which extend from {TAIL ~ the actuator body}, wherein the entire lower edge of each wing curves continuously outwardly and upwardly from the body 
The actuator has at least one pair of { HEAD ~ wings } which extend from { TAIL ~ the actuator body } , wherein the entire lower edge of each wing curves continuously outwardly and upwardly from the body
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH