{HEAD ~ An intermediate section} of {TAIL ~ the rotor} has shear webs bonded above and below spaced apart spar caps, providing a stiff box beam cross section 
of
{ HEAD ~ An intermediate section } of { TAIL ~ the rotor } has shear webs bonded above and below spaced apart spar caps , providing a stiff box beam cross section
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH