The craft is lighter than air, such as a dirigible airship , and has {HEAD ~ flat projection surfaces} on {TAIL ~ each} of its sides 
on
The craft is lighter than air , such as a dirigible airship , and has { HEAD ~ flat projection surfaces } on { TAIL ~ each } of its sides
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH