Results 1 to 8 of 8
  1. #1

    Join Date
    Sep 2001
    Posts
    501
    Location
    South Weber Utah
    Tractor
    Kubota B2710

    Default How much am I pulling?

    Just trying to figure how much weight I'm pulling with a full 60" Land Pride box blade. With a 60" width, 17" high moldboard and a bucket depth of 22" I figure the bucket has a capacity of about 12-13 cubic feet. Nearly a half yard. At about 2700-3000 lbs per yard of soil, that makes a weight of around 1300 lbs in the box. Am I figuring this correctly?

  2. #2

    Join Date
    Aug 2001
    Posts
    542
    Location
    Campbellville, Ontario
    Tractor
    Kubota L3010, BX2200

    Default Re: How much am I pulling?

    yup, assuming the box is completely full, which is unlikely. I would think that friction and the effects of (more or less)shearing the soild at the blade would add a lot more to the load from the tractors' perspective.

  3. #3
    Old Timer Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    51,662
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: How much am I pulling?

    I think you are overestimating the weight of a yard of material. Nominally, a cy of dirt should weight about 2000lbs, give or take for moisture. A yard of 3-4kpsi concrete is going to be closer to the 3k# figure, again, give or take.

    A mechanical engineer will be better able to comment on the weight carried, and apparent load at the blade, friction coefecient, etc, etc.

    Soundguy

    <font color=blue>"Just trying to figure how much weight I'm pulling with a full 60" Land Pride box blade. With a 60" width, 17" high moldboard and a bucket depth of 22" I figure the bucket has a capacity of about 12-13 cubic feet. Nearly a half yard. At about 2700-3000 lbs per yard of soil, that makes a weight of around 1300 lbs in the box. Am I figuring this correctly? "

  4. #4
    Elite Member hazmat's Avatar
    Join Date
    Feb 2002
    Posts
    4,028
    Location
    West Newbury, MA & Harrison, ME
    Tractor
    Kubota L5460HSTC

    Default Re: How much am I pulling?

    <font color=blue>A mechanical engineer will be better able to comment on the weight carried, and apparent load at the blade, friction coefecient, etc, etc</font color=blue>

    I'm a mechanical engineer. Here is the result of my detailed analysis.

    You are pulling much more than you could without the tractor [img]/w3tcompact/icons/grin.gif[/img]

  5. #5
    Old Timer Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    51,662
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: How much am I pulling?

    See... I knew someone would step in. What was the old joke people always used to tell me?.. Ok.. What is the difference between a civil engineer, and a mechanical engineer? Civil eng's build targets.. mechanical eng's build the toys to use on the targets.

    Guess I better go start building some targets....

    Soundguy

    <font color=blue> mechanical engineer will be better able to comment on the weight carried, and apparent load at the blade, friction coefecient, etc, etc

    <font color=red>I'm a mechanical engineer. Here is the result of my detailed analysis.

    You are pulling much more than you could without the tractor

  6. #6
    Elite Member hazmat's Avatar
    Join Date
    Feb 2002
    Posts
    4,028
    Location
    West Newbury, MA & Harrison, ME
    Tractor
    Kubota L5460HSTC

    Default Re: How much am I pulling?

    Here is the real answer to your question. I've calculated a theoretical drawbar pull for your tractor. I've made a few assumptions:

    1. After all the losses in the driveline, You get 20 HP to the wheels. (optomistic)

    2. You have enough traction to use all 20 HP (also optomistic)

    3. I'm assuming a 100:1 gear reduction
    You can go about 4mph in low gear, &amp; your rear tire is about 4 feet in diameter
    4mi/hour*hour/60min*5280ft/mi = 352ft/min
    4ft*pi=12.6ft/rev
    (352ft/min)/12.6ft/rev = 28rev/min wheel speed
    engine 2800rev/min / 28 rev/min = 100:1

    Torque calculation
    20HP * 550 Ft-LB/sec = 11000 ft-lb/sec
    11000 ft-lb/sec * min/2800 rev * 60 sec/min = 235 ft-lb per rev

    235 ft-lb/rev * 100:1 gear reduction = 23500 ft-lb/rev

    23,500 ft-lb/ 2 ft radius = 11,750 pounds drawbar pull!

    Consider this a maximum, It is optomistic, I could be off by a factor of 3 +/-

    I took an educated guess at your gear ratio, it may be off.

    Like I said before, much more than you could pull without the tractor [img]/w3tcompact/icons/grin.gif[/img]



  7. #7
    Old Timer Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    51,662
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: How much am I pulling?

    The local mobile home dealer made a special 3pt. mobile home toter. What it is, is a dolley that supports the tounge weight of the mobile home on a swivel with two small wheels. From the dolley is a 5' bar that attatches to the back of the tractor via a 2" receiver. ( looks like the modified or made a beefy standard trailer dolley, then modified it to be tractor powered. )

    Anyway, they move those mobile homes with a big case/ih.. older model. I saw them moving one the other day.. was only going like 2-3 mph.. but id didn't look like there were any problems. Amazing what you can pull with gear reduction, sufficient traction, leverage, and a rolling load.

    Soundguy

    <font color=red>"Consider this a maximum, It is optomistic, I could be off by a factor of 3 +/-

    I took an educated guess at your gear ratio, it may be off.

    Like I said before, much more than you could pull without the tractor "

  8. #8
    Platinum Member
    Join Date
    Jan 2002
    Posts
    856
    Location
    South West Pa/Greene county
    Tractor
    Long/Landtrac360DTC

    Default Re: How much am I pulling?

    <font color=blue>Amazing what you can pull with gear reduction, sufficient traction, leverage, and a rolling load.</font color=blue>

    I pulled a mobile home up a slight grade with a my 36hp Long/Landtrac, just put it in low and used the diff-lock till I got it rolling. Pulled it right up to the pad with no problems.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2016 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.