Comparing Blade Design and Mass for Performance

9:15

22:03

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At 9:15 in

Testing Brush Mowers & Land clearing Equipment in Extreme Conditions

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What happens here

Shane highlights the critical role of blade design in brush mower performance and safety. He displays a heavy, long blade (approximately 16 pounds each) with an offset, emphasizing that this offset is crucial for effective mulching and keeping the blade close to the ground. Using two such blades on the stump jumper allows for longer overall blade length, contributing to greater cutting momentum. Unlike brittle blades that shatter, these blades are designed to be ductile, bending upon impact to prevent dangerous shrapnel and costly damage to the mower's gearbox or shafts. He explains that you can achieve similar energy output either through high tip speed with lower mass or low tip speed with higher mass. For brush and grass clearing, which represents the majority of users' needs, Quick Attach favors higher tip speeds for cleaner cuts and increased energy.

Goal: Understand how blade design, material, and mass influence cutting performance and safety.

Tools and materials

Brush Mower Blade Quick Attach — Demonstrating blade design, offset, and material properties
Tape Measure N/A — Measuring the size of the tree stump

What they say

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speed of that rotational mass so we're using two blades that look similar to this and it's important that you make blades that have an offset if you want to do good mulching okay so we got this bolted to our blade care and this offset is keeps the blade down close to the ground so this offset is kind of a critical element to the success of the overall design right and the other thing about using two blades is that you could your blades can be longer overall that if you have a large Stumpjumper diameter with shorter blades wait a minute stump the blade carrier or Stumpjumper it's the part that the blades bolt to underneath and we'll show it to you later okay but the advantage there is that you can use a blade this blade is like 16 pounds and we have two of them so you have that spinning mass as well right but not only that but the mass is farther away from the bolt the rotational axis of the belief tree okay so we got high tip speed out here but we've got a lot of mass behind it at the blade can you help me understand the reason you guys have seven different units for skid steers because it's not a one-size-fits-all correct okay so can we kind of walk down through all of these and maybe you can help me understand the key differences between them so as I I was a consumer and I'm like I gotta spend a lot of money where should I hone in at sure okay where should we start smaller okay so now what would this unit fit on it would fit on what we call mini loaders and so an example of this would be what we sell here the genesis machine okay and they have flow rates maybe up to about 15 gallons minute and then the flow rate is pretty much it has to be part of that whole combination right yeah usually we see at least 10 gallons a minute they'll operate at lower flow rates but the performance is less so then you guys do a kind of a big jump off from this 42 to now these all look like they cut the seat yeah so what I did was I brought out all 72-inch mores but we actually sell these mores in four different widths so 60 66 72 and 78 all of them no just these two mores right here oh just the ten our tractor more we also have four whips or well again one more so again you can use the whip to help match to the horsepower of the machine okay so you don't want to put a 78 inch more on a really small skid steer because it's gonna again you're you're doing more work under that 78 inch circle it's just so BA yep it's got to be proportional it's just not gonna work okay so so…

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