Calculating weight distribution.

Discussion in 'Flatbed Trucking Forum' started by dlstruck, Jun 1, 2017.

  1. dlstruck

    dlstruck Medium Load Member

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    I figured 2.5 feet or so would be enough but didn't want to take any chances because they didn't have a scale on site or anywhere nearby so I moved it back 4 feet. The broker also called me last night and said they needed to add a 500 LB pallet. I told him I'll need to make a few extra stops because I won't be able to do that with full tanks so he added a few hundred to the rate. I'm at 39.5k on the spread 30K on the drives. Scaled 80340 with full 125 gallon tanks so I need to burn about 50 gallons to be legal. First weigh station is about 200 miles away so it's not quite enough but I can always throw out some dunnage.

    Thanks for your help Chewy! I'm gonna do some exact measurements and weights so I can make a calculator in Excel. I'll post it up here when I'm done with it.

    Here's a pic of the load. Hopefully my poor trailer makes it and you don't read about me in the news lol.
    [​IMG]
     
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  3. Chewy352

    Chewy352 Road Train Member

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    Do you have an apu? If so you may be legal with full tanks. Vehicle weight exemptions for APUs, Owner-Operator Independent Drivers Association
     
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  4. Chewy352

    Chewy352 Road Train Member

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    8 inches forward from where you put it and you'd have a much smoother ride. You did like I always did without a scale on site. Put it where is legal and take less chances and not waste time reworking it. Just be careful in slick conditions.
     
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  5. dlstruck

    dlstruck Medium Load Member

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    No APU, I'm too cheap for that lol. I try to stay out of the hot states and installed a bunk heater for the winter.

    Yeah that's what I figured. I had the time but didn't want to go back and forth between scales and shipper. Forecast is nice and sunny with no rain so I should be fine like this.
     
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  6. dlstruck

    dlstruck Medium Load Member

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    Trailer made it without breaking! Didn't get a single bypass, had to pull into every open weigh station. Had a few come and and look at it and ask me questions about it but no inspections. I don't get it, I got my authority a year an a half ago and still not a single inspection on any of my trucks, even during last year's blitz.
     
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  7. CharlieK

    CharlieK Medium Load Member

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    You start working on that excel calculator? I'm curious to see what you come up with!
     
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  8. dlstruck

    dlstruck Medium Load Member

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    Not yet, haven't had much time. I keep wanting to take a week or two off to catch up on paperwork and stuff but all these easy loads keep popping up so I don't want to pass on them lol.
     
  9. Zeviander

    Zeviander Road Train Member

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    That's a beastly load. I would have told you essentially what Chewy said, except I would have just pulled out the measuring tape and measured from the front of the trailer to find centre.
     
  10. Professional Passenger

    Professional Passenger Bobtail Member

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    First you need to know a few critical numbers.
    1)Your empty axle weights.
    2)Add your empty weight to the payload and calculate your target axle weights.
    3)Your target axle weights.
    4)Subtract the target trailer axle weight from the empty trailer axle weight. This will be known as tPw (target axle Payload weight) in the formula.
    5)Your Trailer Wheelbase (in inches). This is a measurement from your kingpin to the center of your trailer axle group. This is w/b in the formula.
    6)The Payload Weight. This will be PW in the formula.
    7)CoG is the Center of Gravity of the load, or also the Center of Balance point of the trailer. If the load has a CoG mark, this is the balance pinpoint.

    Here is the formula:
    Measurement from Kingpin to CoG=(tPw*w/b)/PW

    I have an Excel setup that you enter:
    Your empty axle weights
    Your target axle weights
    Your trailer Wheelbase
    The payload weight
    And it calculates everything from there and provides all the measurements, but I can't attach an .xlxs file.
     
    Last edited: Jun 5, 2017
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  11. Zeviander

    Zeviander Road Train Member

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    [​IMG]
     
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