The plane of the stirrer blades 15 is inclined at {HEAD ~ an angle} of inclination alpha to {TAIL ~ the rotation axle} 
The plane of the stirrer blades 15 is inclined at { HEAD ~ an angle } of inclination alpha to { TAIL ~ the rotation axle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL