Four blade brush cutter: Field Mowers Brush Cutters  -- Tractor Attachments Implements 3ph Discussion Forum and Review Four blade brush cutter: Field Mowers Brush Cutters -- Tractor Attachments Implements 3ph Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

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 02-15-2005, 20:17 Post: 106201
STEVEM



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 Four blade brush cutter

Has anyone had experance with a four blade brush cutter? The one I'm looking at is a 5 foot Condor brand. It's used and I can't find any information about them, such as recomended HP ratings
I have an L2900 Kubota 33 HP. I'm using a 5 foot two blade cutter now and it works fine with this tractor.
Does a four blade cutter work better than a two blade cutter?
Is there such thing as a cutter with a faster blade tip speed? If so would that be a better way to go?
I'm looking for a better cut and moore ground speed.






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 02-16-2005, 09:03 Post: 106218
Murf

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 Four blade brush cutter

While I'm not familiar with the condor brand, per se, 4 blade bush hogs.

They were an attempt to make a single cutter that would do finish cutting and rough cutting all in one. It failed.

The physical design of a bush hog is such that on anything less than pool table flat ground they will tear up the turf if you lower them to 'finish cutting' heights. They simply do not have the anti-scalp design or wheels necessary.

As for cutting faster, or better, that is good question. As for better, probably they would leave a slightly nicer looking cut, but only if the blades were kept very sharp and well balanced.

As for faster, not likely in any significant manner, it takes a certain amount of horsepower to cut a given volume of standing grass, period. They only way to practically cut more grass is more horsepower.

Best of luck.






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 02-16-2005, 13:50 Post: 106240
denwood



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 Four blade brush cutter

I would tend to agree with murf in your instance. Your HP will be the limiting factor. As far as nicer, I doubt it. If 2 blades are sharp they will be nice too. You don't see many high end finish mowers with 4 blades and their job is to look good. Faster yes, but maybe only on paper. Having 4 blades will mean another blade is cutting in half the time it would take for 2 blades(given equal tip speed), meaning you could go twice as fast and still have the same amount of grass being cut per blade.






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 02-16-2005, 13:52 Post: 106241
denwood



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 Four blade brush cutter

The question is how fast do you have to go to overwhelm a 2 blade cutter(not considering HP). I think that speed would be too fast to be truly usefull and not bouncy and hard on equipment. If you had the HP to mow x square feet of grass per minute, it would be better to go wider and slower than narrower and faster in my opinion. I would however look at tip speed of same sized mowers since faster tip will result in more cuts/given time and allow slightly faster ground speed with the same amount of grass cut per rotation, and a higher quality cut.






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 02-16-2005, 14:07 Post: 106243
hardwood

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 Four blade brush cutter

I agree that going faster with the same cutter will result in more power needed in tall stuff or a poorer cut in short grass. I doubt that four blades would do much better than two sharp ones. Just a question I've allways had, but never taken the time to do the math. As blades become dull the outermost part of the blade wears off first, so at a given forward travel speed and a known rotor speed how far forward does the unit advance before the next blade makes it's cut? Half an inch, three quarters, or an inch? Food for thought. Frank.






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 02-16-2005, 14:24 Post: 106246
Murf

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 Four blade brush cutter

It's a relatively (he says tongue planted well in cheek) calculation Frank.

At say 5 mph, the tractor, and we hope, the cutter too, are moving forward at the rate of 5,280' an hour or divided by 60 minutes, 88' per minute.

Using a 5' cutter in our example, one blade has to travel 188.5" to make one full rotation. The 5' cutter would, at 540rpm drive speed, have a tip speed of about 12,725' per minute. That means it would travel 152,700" per minute. If we divide by the circumference of 188.5" we get 810rpm.

So, know we know that in one minute, a) the cutter moves 88', b) the pair of blades turns 810 times, and therefore, c) a blade makes a pass, 1620 times in 88', or 1056". So to get a 'per cut' figure, we divide 1620 times by 1056" and get 1.534.

Now, after all that, we know that each blade cuts about 1.534" per cut.

Don't you feel better knowing that now? Laughing out loud.

Best of luck.






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 02-16-2005, 14:36 Post: 106247
hardwood

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 Four blade brush cutter

Murf, You don't know what a load you've taken off my mind, so I'll sleep lots better now. In real world I probably don't go more than 2.5 to 3 mph. So being you used 5 mph my wild guess wasn't too far off. Altho I've often thought of the question while doing my mowing (therapy) it really wasn't that important, just kind of a fun way to pass a cold Feb. afternoon. Enjoy your day. Frank.






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 02-17-2005, 09:20 Post: 106279
AnnBrush



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 Four blade brush cutter

Given a fixed HP tractor, you won't be able to travel any faster using 4 blades.

You are cutting less (half) grass with each blade but you are cutting twice as often (four cuts per rotation as opposed to two). Net advantage (assuming linear relationship between cutting half the grass twice as often vs all the grass at once) is zero to the observer on the tractor.

Musing on this, with 4 blades you may only wear the tips of the blades out while the remaining shank does less work (length of swath cut per blade is shorter when additional blades are installed). If this is the case you have replaced the middle of the cutting portion of the existing blades with new blades that are not needed in the first place.

There may be advantages to each blade doing it like this (for example blades wear half as quickly, but then you have to maintain twice as many). I see no advantage yet.






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 02-17-2005, 11:21 Post: 106285
s chrand



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 Four blade brush cutter

Re inches per cut
I in no way wish to impugn the well deserved reputation of Murf, for I have learned a great deal from his posts, but there were two problems with the above calculation.
First, feet per minute at 5 mph is 5 x 5280 / 60, or 440. The 5 was omitted.
The rest of it makes sense, except that the final division is reversed. It should be 1056 divided by 1620 for a result of .65" per cut (at 1mph). At 5mph that would be 3.26" per cut.
A simple formula is (1056 x mph) / (spindle RPM x N cutters per spindle).
So now I wonder, what is a good amount to cut, and should the RPM of the PTO be modulated to correspond to the ground speed?

PS All of the above is the engineer in me totally out of control!






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 02-17-2005, 12:07 Post: 106287
denwood



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 Four blade brush cutter

Obviously you have a hydro. Ground speed vs. pto is directly linked for gear drive. You only get to choose by however many gears you have. Winding down the pto rpm too much results in a poorer cut and more tearing of the material, although I always run at a low rpm/pto unless I am mowing grass, then I use at or close to 540.






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