The reciprocating mechanism undergoes generally free {TAIL ~ flight} with energy being supplied only as required to maintain the nominal speed in the face of {HEAD ~ minor friction losses} and the like 
The reciprocating mechanism undergoes generally free { TAIL ~ flight } with energy being supplied only as required to maintain the nominal speed in the face of { HEAD ~ minor friction losses } and the like
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH