When {HEAD ~ blade} 2 is in {TAIL ~ the upwind} or in the downwind sectors of the cylindrical path it creates mainly drag and drive component forces 
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When { HEAD ~ blade } 2 is in { TAIL ~ the upwind } or in the downwind sectors of the cylindrical path it creates mainly drag and drive component forces
OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH