Lawn Mower Blade Types - How to Choose the Right Blade

Lawn mower blades come in many shapes and sizes. Maybe you've been wondering why this is so. The reason for the size change probably doesn't need much explanation. However, we can tell you why many lawnmower blades look like they've been hammered into incomprehensible shapes. Various lawnmowers require different aerodynamics to achieve their purpose. Therefore, there are many types of lawn mower blades to match these different applications.

Before really trying to understand the various lawn mower blade types, it can be helpful to first understand how a lawn mower cuts grass. For a blade to cut grass efficiently, it needs to pull each blade or stem up into its cutting path. It also needs to provide resistance at both ends of the grass. This prevents the mower blades from simply slapping the grass back into uncut soil.

To achieve this, blade manufacturers borrowed and adapted aeronautical designs. Similar to how the wings of an airplane use wind resistance to provide lift, a lawnmower blade has a rising portion at the back of the blade. This creates lift and pulls the air up as it spins. Pulled by this bump, the grass stands up for the blade—the suction provides some resistance at both ends. This lets the mower blades actually cut.

Of course, different upturn angles at the rear of the blade will produce different results. Manufacturers design inserts with different lift types and cutting edges to serve different applications.

Sometimes referred to as a 2-in-1 blade, the standard blade probably gets the most use in the lawn mowing game. In most cases, these blades have an aerodynamic design. It puts less pressure on the engine as it turns. The front cutting edge remains flat. At that trailing edge, a slight uplift creates a continuous "suction cut" action.

Because these mower blade types provide a lot of lift in one direction, they provide excellent results when unloading and bagging on the side.

Low-lift mower blades work best when you're mowing sand grass. These give the blade enough lift to cut your grass, but won't let your super sandy lawn be pulled over to the deck as well. The reason has to do with the size of the fins on the blades. It provides less lift than standard types of lawn mower blades.

These blades don't cut as well on stronger grass than higher lift blades. However, they don't pick up as much dust. Also, because they create less drag, these blades also consume less fuel.

High-lift mower blades produce more lift due to more upturn at the rear of the blade. Because it produces so much lift, a high-lift blade requires a more powerful engine to function properly. Therefore, it may cost more fuel to use it. However, it usually cuts thicker grasses better. This is ideal when you are bagging clippings, as the improved lift lifts the clippings up and off the deck.

Covered blades have a more unique design than standard or high-lift blades. Instead of a relatively straight cutting edge with raised wings on the back, the cover blade has multiple bevels and raised areas.

This design allows your lawnmower to suck up the grass for cutting. However, clippings flew around the deck and ended up being cut even more. The middle part of the mulching blade, the odd bit, is designed to send the nutrient-rich finely chopped bits back to the ground, where they can feed the soil.

You can still use the cover blade for bagging or side discharge if you prefer. However, these blades do not provide as much lift as standard blades. They are also much better at maintenance cuts than overgrown ones.

Regardless, it's best to keep your specific application in mind when choosing a lawn mower blade type. Are you going to put the clippings away or leave them in the yard? What lawn conditions are you using? Is your grass thick or overgrown or patchy and sandy? Do you want to win the award for best lawn, or just want to mow the lawn before your neighbors complain? Knowing the differences between the various lawn mower blade types will help you get the best cut type for you. If you want to buy lawn mower blades, welcome to contact us.

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