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