leonz
Super Member
========================================================================================================================================================================================================================Well, there you go...a T shape would certainly have an entirely different cut, and they probably made them that way because they eliminate serrations. They probably are much more expensive to make them strong enough to handle the stress of a 90 degree angle. Not sure why more manufactures don't offer this option.
The reason you see serrations when mowing at a low height with a flail mower is due to the fact the almost every flail mower rotor made has mounting stations that are narrow and they have enough width between the station mounts to permit the installation of the knife pairs.
The flail mower rotors with the mounting loops/D rings permit the manufacturer to purchase short knives to fit out the flail mower and it also allows the manufacturer to mount the scoop knife/duck foot knife on them as well to enable the user to mow heavy brush and also mow fine grass but it leaves a waffle pattern unless the user mows at right angles to overlap and cut the grass again to achieve a nicer look.
This also allows the use of side slicer knives that have elongated mounting holes which allows them to become airfoils and permit them to mow a wider cut with overlap with the knife pairs following behind them to mow any grass that the preceding pair misses. This is why in the first instance you see flail mower rotors with 3 rows of mounting stations with a wider space between the mounting stations on each row.
These same flail mower rotors also have additional mounting holes to add more knife mounting stations to use more side slicer knife pairs when mowing good sod.
The flail mower knives that are considered scoop knives are sheared, punched for two mounting holes, rolled and formed so the elongated or round mounting holes meet to
create a thicker steel mounting point then the cutting edges are ground, then heat treated. There are scoop knives that are nit heat treated just like some side slicer knives.
The only down side for a hammer knife or scoop knife is that they will not recut the clippings UNLESS they are dry and brittle and have little weight if they have not been weighted down with rain and begin to choke out the good grass on lawns.