The side opposite the skin on {TAIL ~ the second grid structure} is preferably covered by {HEAD ~ a further inner skin}, for example secured by casting or by an adhesive 
The side opposite the skin on { TAIL ~ the second grid structure } is preferably covered by { HEAD ~ a further inner skin } , for example secured by casting or by an adhesive
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH