Are you sure the belt is on correctly?.
You have the wrong blades installed - they are just a tad too short for your application and leave that trail of uncut grass down the middle. I had the same problem until I bought a set of blades that were 1/4" longer.
Your blades either need to be replaced or sharpened quite a bit. Either that or your cutter is set too high and needs to be lowered.
Not necessarily when to change; but when to sharpen mower blades: The easiest way to know is by observing the way the grass is cut. A sharp blade will make a "clean cut" on the grass blades, whereas a dull blade will "tear" the grass and leave a "ragged" appearance. As far as when to change out the blades, there is no set time interval, you just have to visually evaluate the condition of the blade (bent, badly worn, warped, etc.) to determine when to change. If your mower uses 2 blades, it would be wise to change both blades at the same time.
I actually leave the clippings, but I have a mulching blade on my mower which cuts up the grass a little finer that non-mulching blades. If you have a mulching blade and leave the grass cuttings they just decompose but if not and you leave too much, it could cause some issues, more thatch, etc.
Scalping in turf grass is caused by :- (a) Setting the height of cut too low and removing too much of the grass blades as you cut. This can leave the the lawn looking straw coloured as if it had been scorched. (b) Removing most, or all of the grass blades on raised areas of the lawn as you mow over them even if the height of cut is correctly set for the majority of the area.
probably center blade on deck is jambed, or blade is broken and or missing I am having the same problem with may 42" Scott's riding mower. The blades are new (there are only 2 blades , no center blade) and are installed properly. The belt is also new and installed properly. The uncut middle area is more predominant in thicker or taller grass. In the center of the front of the mowing deck is a roller (to keep the deck from bottoming out ) which may be causing the grass to flatten and not be cut. If anyone else has had this problem and has a solution I would be interested in it.
One of several reasons: (1) the blades need sharpening; (2) you are trying to mow at a higher speed than is required; (3) one or both blades are installed upside down; (4)one or both blades are bent. My best guess is (1) and/or (2).
Study leave.
The short and simple answer is this: A wind turbine consists of blades; similar to those of a helicoptor. These blades are attached to a generator. As wind causes the blades to move, the blades turn the generator to produce electricity. As to how a generator works; I'll have to leave that up to someone else to explain.
If you cut your own grass and leave the cut grass on your lawn it acts like a self fertilizer
Always down and on the floor.
leave it alone