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Tractor Pulling Discussion Forum

advantage of drawbar height

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jdpullman

08-05-2010 06:12:04




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Wat is the advantage of having ur drawbar as close to the max height as possible??




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BushogPapa

08-07-2010 09:44:45




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
To maintain the "Hitch Height" while pulling, you MUST keep the front near the ground..!!

Anytime the Front rises, the Drawbar (hitch-point) Lowers..reducing weight on the tractor and Increasing the friction on the sled..making it actually harder to pull..

Normally, when the front comes up, you are about at the end of your pull..

Ron.



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MLPANKEY

08-08-2010 08:09:01




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 Re: advantage of drawbar height in reply to BushogPapa, 08-07-2010 09:44:45  
Quoting Removed, click Modern View to see Ron you just gave out a secret that Zack could have sold. how much down force does it take to lift 500lbs 12inches off the ground when the weight is 11 feet from the centerline of the fulcrum



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BushogPapa

08-08-2010 16:37:10




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 Re: advantage of drawbar height in reply to MLPANKEY, 08-08-2010 08:09:01  
Don't need to actually "Lift it"..just take more off the sled than the next guy and Stroll away with it...!!!

Saw a young fellow we ALL know once hook his JD with the drawbar set "Long"..(once)...!!

I'll not say his name....!!!!! !!!!

Ron.



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mlpankey

08-07-2010 08:08:53




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
If there were no advantage to having the hitch as high as possible then they wouldnt be a rule as to the maximum height you can have and still pull.



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Blackstack

08-06-2010 22:44:51




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
Some of you guys really should have paid more attention during BASIC high school geometry/physics/math instead of trying to look down Suzy's new blouse. C'mon fellas, somebody's gotta post a thread asking why the fat kid has to sit closer to the pivot point than the rail thin kid on the play ground so we can be amused by the responses too. Your ignorance is breath taking.



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Kip-Utah

08-06-2010 14:08:10




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
I have an A-C C that won alot of 2500-3000lb. classes with a hitch around 16" high. Thought I was leaving something on the track & went about 18.5" high & did better at a couple of pulls considerably poorer at some others. Tried 20" (our limit) at last pull & got an instant wheelie from start to finish & placed dead last. I'm going back to something around 17"-18" and hope to get things working again. Kip

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jd plowboy

08-05-2010 13:20:15




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
i bought a wc allis puller awhole back and the guy was pulling it with a 24 inch long hitch and 20 inches high and he won some points championships with it in his area. he also ran a short weight bracket on front. i changed it to our rules of 11 foot from axle on front bracket and 18 and 20 on the hitch and it would not hook up at all. i sold it to a guy that was in the first guys area and he put it back like it was and was wearing them out wiht it. what i am trying to say is what works for one puller may not work for another so you have to try it and see what works good on height.

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High Octane

08-05-2010 23:00:35




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 Re: advantage of drawbar height in reply to jd plowboy, 08-05-2010 13:20:15  
18/20 is a limit. Don't mean you gotta be there right off the bat. Sometimes, longer and lower can work out if your playing with alot of weights, decent track, sled chain length best be accounted for, and under 100 hp. Tire OD and the right OD for the power to gear to rpm to weight placement to track condition to gear selection to how much you spent on your motor, how much you spent on your tires, can be the big discussion after you kick their aZZ.

Oh, hitch height was what he wanted to know right? Why? Because. Limits, or recommendations.

How that drawbar is attached to the tractor, and the angle of the drawbar is very important.

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MMZAck

08-05-2010 09:43:20




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
The highest drawbar height will yield the highest vertical component of force acting downward on the hitch. Pulling is all about maximizing traction, so the more force you put downward on the hitch, the more you are loading the rear wheels.

Depending on chain length and weight class, the actual difference in vertical force for given hitch height will be different and could be 1000lbs per inch of height in some of the heavier classes. It makes a big difference.

Zack
----- --

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johndeereman

08-05-2010 08:50:09




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 Re: advantage of drawbar height in reply to jdpullman, 08-05-2010 06:12:04  
a friend of mine expirimented with this awhile ago and claims that 1 inch of drawbar height is equivalent to almost 1000 pounds on tractor i think its a bit much but thats what he claims



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CoopertownBob

08-05-2010 06:31:51




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 Re: advantage of drawbar height in reply to mkr100, 08-05-2010 06:12:04  
Quoting Removed, click Modern View to see

The claimed advantage is that it helps to pick up the front of the sled during the pull. This can be negated by the use of a long chain however. On the other hand, the reverse is that it allows the sled to pull down on the back of the tractor harder, which could either increase traction, or allow the front end to come up easier and higher, which brings us to the other part of this theory, and that is having as short a hitch as the rules allow, i.e. how far behind the tractor the hitch point has to be, to help alleviate the leverage that the sled can place on the tractor to cause its front to rise. The best advice I can give you is to try both high and low and see what works for your tractor in the classes you pull.

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