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#1
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Pulling Force
I've got a simple problem for y'all but it its going to have a
complicated answer. Let me set up a senario: You've got a rope,cable,chain, or other pulling device that (ignoring shock loading) has a break strength of 40,000 lbs. How large of a vehicle can I "get unstuck"? Specifically though I'd like to know how much force to pull a fully loaded tractor-trailer (semi) full of beets out of mud (up to its axle). I realize that this depends on the how the vehicle is stuck, what it is stuck in, how deep, whether or not the vehicles wheels are able to role, etc... A better question might be: How much pulling force, without "jerking" or "getting a run at it", can a vehicle produce under ideal circumstances. 4X4 Pickup Truck? Semi? 2WD Tractor? 4WD Tractor? Dozer? Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP but I can't get a draw-bar pulling force from HP (without a few more details). Taking engine torque and multiplying it by the drive ratio seems like perhaps the only way to get somewhat close (although perhaps a bit exaggerated). Josh |
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#2
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g3_josh wrote:
> > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). Assuming all have about equal traction, pulling force would be fairly proportional to the pulling vehicle's weight. Make a guess of the ground's coefficient of friction (0 - 1 is typical) and multiply by the vehicle's weight for a pulling force. A dozer would probably be the best with the crawler tracks increasing the traction over pneumatic tires. -- Roger |
#3
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g3_josh wrote:
> > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). Assuming all have about equal traction, pulling force would be fairly proportional to the pulling vehicle's weight. Make a guess of the ground's coefficient of friction (0 - 1 is typical) and multiply by the vehicle's weight for a pulling force. A dozer would probably be the best with the crawler tracks increasing the traction over pneumatic tires. -- Roger |
#5
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On 1/19/04 7:37 PM, in article
, "g3_josh" > wrote: > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh Rules of thumb: PTO horsepower is about 86% of engine horsepower. Drawbar horsepower is about 86% of PTO horsepower. I think this is for 2WD tractors in average conditions. One horsepower = 33,000 Ft.Lb./min There isn't a good answer to your question without more information. How big are the tractors? 100 HP? This won't help you much since traction difference will probably be a big factor. The tractors should easily out pull the pickup and probably the semi in dirt or mud. The dozer should out pull everything on dirt. My guess is the dozer wouldn't do too well on concrete. Wheel slippage for tractors is usually in the 10% -15% range in good conditions. That's considered the most efficient for field work. You might be able to get some information on drawbar pull from the University of Nebraska Tractor Test Lab. I don't know if they have a website. Dean -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#6
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a good size track dozer and you wont even know the trailer is there. just
tell the driver of the rig to leave her in neutral unless she needs a bump start as well ;-) be careful not to peel the tires off the rim... "g3_josh" > wrote in message om... > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh |
#7
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a good size track dozer and you wont even know the trailer is there. just
tell the driver of the rig to leave her in neutral unless she needs a bump start as well ;-) be careful not to peel the tires off the rim... "g3_josh" > wrote in message om... > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh |
#8
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I do not know the answer to an equation to solve your problem.I do know my
uncle owns a Year : 1985 Make : CAT Model: D6D Bulldowser. It is a big machine. Pulling a Fully Loaded Semi even stuck up to the axles is a piece of cake. I have seen him pull a Cat Backhoe out of a revine approximately 80 feet down. The Backhoe was not even upright.It dragged it up on it's side like a Tonka toy. Doug "g3_josh" > wrote in message om... > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh |
#9
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I do not know the answer to an equation to solve your problem.I do know my
uncle owns a Year : 1985 Make : CAT Model: D6D Bulldowser. It is a big machine. Pulling a Fully Loaded Semi even stuck up to the axles is a piece of cake. I have seen him pull a Cat Backhoe out of a revine approximately 80 feet down. The Backhoe was not even upright.It dragged it up on it's side like a Tonka toy. Doug "g3_josh" > wrote in message om... > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh |
#10
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The usual word of caution ... my buddy thought he'd be a smart ass and took
his cat into the soggy field to pull out the tractor ... you guessed it ... it sank. "g3_josh" > wrote in message om... > I've got a simple problem for y'all but it its going to have a > complicated answer. Let me set up a senario: You've got a > rope,cable,chain, or other pulling device that (ignoring shock > loading) has a break strength of 40,000 lbs. How large of a vehicle > can I "get unstuck"? Specifically though I'd like to know how much > force to pull a fully loaded tractor-trailer (semi) full of beets out > of mud (up to its axle). > > I realize that this depends on the how the vehicle is stuck, what it > is stuck in, how deep, whether or not the vehicles wheels are able to > role, etc... > A better question might be: > > How much pulling force, without "jerking" or "getting a run at it", > can a vehicle produce under ideal circumstances. > 4X4 Pickup Truck? > Semi? > 2WD Tractor? > 4WD Tractor? > Dozer? > > Tractor manufacturers sometimes give a PTO HP or even a draw-bar HP > but I can't get a draw-bar pulling force from HP (without a few more > details). Taking engine torque and multiplying it by the drive ratio > seems like perhaps the only way to get somewhat close (although > perhaps a bit exaggerated). > > > Josh |
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