Flail mowers are usually used for industrial purposes, where a rough cut to the grass is needed without the mower being damaged by contact with debris beneath. The mower works by having rows of flails or knives with are attached to a rotating drum at staggered intervals, thus providing a looser type of cut.
Normal flails are in the shape of a ‘Y’ or a ‘T,’ however specialist shapes are also available for different types of tasks, for instance creating a less loose cut. Because these flails are attached to a spinning drum, centrifugal forces push the outward, and the chins simply bounce off if they hit a solid object without damage to the mower, or operator. Flail mowers are usually designed to be attached to a tractor, however there are also some stand alone varieties on the market.