Page 1 of 4 1234 LastLast
Results 1 to 10 of 37
  1. #1
    New Member
    Join Date
    Nov 2012
    Posts
    15
    Location
    Gerogetown KY
    Tractor
    FORD 1715 4WD

    Default Blade tip speed

    So I'm looking to buy a rotary cutter/ bush hog. There is all kinds of brands and options out there. I have a ford 1715 that has 27hp and 23pto horsepower. I'm being informed(by the salesperson) that a 5 foot cutter is the largest size this tractor can handle. Im good with a 5 footer. My question is about tip speed. Does a cutter with 16000 tip speed have more cutting ability vs a cutter with 13000 tip speed? I'm not worried about the quality of the cut, im not using it for my yard. Its going to be used in brush, and tall grass. I want a cutter that does its job without overworking the tractor. So maybe what I'm asking is which cutter has the most torque to power through some hard cutting? A high tip speed or a low tip speed?

  2. #2
    Silver Member
    Join Date
    May 2013
    Posts
    211
    Location
    Georgetown, KY
    Tractor
    Kubota L3800

    Default Re: Blade tip speed

    I am a new tractor owner, but when I was asking questions on the forums I was told to get over 15K tip speed for both rotary cutter and finish mower.

    I'd think that with the higher tip speeds, the inertia of the blades spinning that fast would have a less tendency to bog down and power on through when you hit larger things.

    ...

  3. #3
    Gold Member Hollow's Avatar
    Join Date
    Dec 2011
    Posts
    496
    Location
    Tuscumbia, Al
    Tractor
    New Holland TT45A

    Default

    Higher blade tip speed means more contact times per second. Which when cutting brush that means the blade will be cutting through less vegetation for each rotation. And when mowing fields you might not have to run the tractor at such high rpm's. I run a Bushhog 286 behind my tractor and unless I'm in really thick grass I usually run it 400 rpm's under the 540 mark. It uses much less diesel that way!

  4. #4
    Veteran Member MHarryE's Avatar
    Join Date
    Feb 2009
    Posts
    1,477
    Location
    Northeastern Minnesota
    Tractor
    JD 7720; Kubota M135GX, NH TS115A; JD 6230; Kubota L5740

    Default

    Higher tip speeds result in more energy but also give a sharper cut. Think of a blade of grass, piece of brush, etc. whack it slowly and the piece being cut will bend over slightly as its being sheared off. Hit it fast and there is little bending as the blade slices through. Lower engine speed may reduce your fuel consumption depending on your tractor and its power plus ability to hold that speed, but the cutters are rated at PTO speed for a reason - ability to do the cutting job most customers want.
    JD7720; KubotaM135GX; NH TS115A; JD6230; KubotaL5740

  5. #5
    Elite Member
    Join Date
    Sep 2008
    Posts
    3,266
    Location
    NE USA
    Tractor
    JD LA115, WH 244, WH 525 hydro-pops,Original Troy Built Horse 8 HP

    Default Re: Blade tip speed

    I dont have my hand on your wallet BUT.


    I think your way underpowered for a five footer for sure.

    The not so golden rule is 5 horsepower per foot with a rotary cutter
    or flail mower.

    With a four footer you may have 7 horse power to run the tractor.

    I would ask if you could test mow with a five footer they
    can give you to use.

    You do know that the rotary cutter blades are ment to be ground with a dull edge dont you?

    A rotary cutter only presents half its cutting width to the brush to be mowed with the
    following blade always trailing BTW.

    ANY rotary cutter or brush/grass flail mower will over work your tractor unless its a four footer.

  6. #6
    Bronze Member PandDLong's Avatar
    Join Date
    Apr 2012
    Posts
    77
    Location
    Southern Alberta
    Tractor
    Kubota L3540

    Default

    I ran a 5 foot cutter with my JD 850, which had a little less HP than the OP's tractor, and I was satisfied with the performance. There are a few factors that help determine how many HP you need for the cutter. For me, I was only cutting grass and weeds - no bushes or saplings, I'm on the prairie - no hills to climb, and I was willing to slow down and take narrower cuts when the grass got thick and heavy. For me, the extra foot practically covered my tracks so I could mow close to a fence line and I could cover ground faster when the grass was thinner and/or dry - which was most of the time.

    The specifics of,your needs will either fit a 5 footer or you'll need to drop down a size.

  7. #7
    Elite Member TomSeller's Avatar
    Join Date
    Jan 2013
    Posts
    4,384
    Location
    timbuktu
    Tractor
    Many

    Default

    My opinion is that it depends on how thick the grass is and how thick the brush stems are. If this is tall but not thick grass and not big stems on the brush, you should do fine. Otherwise you might be in low, low gear on your first pass. The next year it will be easier, particularly if you don't let the grass grow full height before you mow. The brush should be less of a concern.

  8. #8
    Veteran Member dirt ditch's Avatar
    Join Date
    Nov 2007
    Posts
    1,960
    Location
    Jayhawker Territory
    Tractor
    which one?

    Default Re: Blade tip speed

    My JD is 27hp / 24pto and it runs a 5' just fine. I also run it 400-500rpm lower than the 540 mark. Does not matter, 540 or slower I mow in L3 of a 2 range gear box with the same results.
    “FERMENTATION MAY HAVE BEEN A GREATER DISCOVERY THAN FIRE” David Rains Wallace

  9. #9
    Super Star Member RoyJackson's Avatar
    Join Date
    Nov 2001
    Posts
    18,841
    Location
    Bethel, Vermont
    Tractor
    John Deere 4400 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: Blade tip speed

    Quote Originally Posted by leonz View Post
    I dont have my hand on your wallet BUT.


    I think your way underpowered for a five footer for sure.
    Not really...the 5 HP per foot of width is a very tenuous guideline. My first tractor was a Deere 670 with 17 PTO HP. I ran a 60" Landpride cutter behind that. Slow going and some partial width passes, but it did a fine job. My second tractor, a Deere 790 with 24 PTO HP and the same cutter did great...very little bogging through heavy brush and quite a few saplings.
    Roy Jackson

    ”"Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

  10. #10
    Gold Member
    Join Date
    Feb 2012
    Posts
    455
    Location
    Albion, Indiana
    Tractor
    1710 Ford

    Default Re: Blade tip speed

    My Ford 1710 amazes me at how well it handles the 60" Bushhog Squealer I have. I cruise through grass, clover, and weeds taller than the tractor with not much problem. It is a good load for the tractor but it is not overworking it. When I get into saplings that I use the loader to knock over I slow down a bit but part of that is just so i make sure I can see and don't get into rocks, mounds, etc.

    Your 1715 should handle it fine. Tip speed - definitely agree with the above 15,000 recommendation.

Page 1 of 4 1234 LastLast

Similar Threads

  1. Replies: 2
    Last Post: 05-21-2013, 08:29 AM
  2. FANTASTIK tip of the day
    By JDgreen227 in forum Rural Living
    Replies: 3
    Last Post: 05-10-2013, 12:06 PM
  3. Blade Speed
    By glc24 in forum John Deere Owning/Operating
    Replies: 7
    Last Post: 05-07-2011, 04:39 PM
  4. MMM Blade Speed
    By The Gardener in forum Kubota Buying/Pricing
    Replies: 2
    Last Post: 06-08-2007, 01:34 PM
  5. speed when using a box blade
    By AlabamaFarmer in forum Attachments
    Replies: 4
    Last Post: 07-07-2005, 01:09 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.