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