Flail mower is a variety of rotary mower, in which the cutting elements are flails shredding mown plants. This mowing system was used in the flail cutter (often called Plowing or rotor). The system, in which flails are sharpened rotating mass on the cutting shaft, works well in mowing wasteland and roadsides. The machine revolutions are often higher than 3000 rpm. The propulsion systems can be mechanical from the power take-off shaft or hydraulic by a hydraulic motor.