A plurality of {HEAD ~ cylinders} is disposed about {TAIL ~ the output shaft} and are each generally parallel to the longitudinal axis 
A plurality of { HEAD ~ cylinders } is disposed about { TAIL ~ the output shaft } and are each generally parallel to the longitudinal axis
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH