{HEAD ~ The rotor spindle} and {TAIL ~ controls} pass through a central hole between the spar caps 
{ HEAD ~ The rotor spindle } and { TAIL ~ controls } pass through a central hole between the spar caps
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH