{HEAD ~ Damper winding} 30 also reduces forces resulting from rotation of an unbalanced force load and reduces {TAIL ~ rotor harmonics} 
reduces
{ HEAD ~ Damper winding } 30 also reduces forces resulting from rotation of an unbalanced force load and reduces { TAIL ~ rotor harmonics }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL