S21 is with single phase motor & S 23 is with three phase motor. Watch Youtube Video
Technical Details :
Design Type : Single Shaft with Four bar mounted rotary blades
No of Rotary Cutters : 24.Drive by V belt
Drum Diameter 300mm Working width: 280mm
Power : 2 HP Three phase Sqirrel Cage foot mounted with 1450 rpm Induction Motor.
Working Capacity :75-100 kg/hr