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lewis
DAVID the paper trail your looking for is THIS none of us go out and buy a new model tractor to make into a puller we all take a 560 .656.4 or5000 ford 4010 jd or such to make our puller theres no paper trail for none of those models to use anything other than what came out in them including yours .technically you are crying wolf when your doing the barking go to the farm show The JOHN DEARE BOYS ARE GOING TO GET TO USE CUMMINS NOW YOUR ANSWER each time a company builds a new 100hp tractor the model that takes THE OLD MODELES place is the FACTORY REPLACEMENT TO THE PREVIOS MODEL the old ntpa rule that the cranckshaft has to swing in the original block has been gone for years

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Ha ha
David, 18" drawbar to 114" wheel base they would be using some air bags with alot of travel - it would be easier to be like little green giant and scale with weights on back then put them where you want

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David Runkle(earls dream)
Badger State also looked at this rule on air ride. We decided not to allow it . Because of that chance of someone letting air out to raise the draw bar before they pull, and having the teck man check it after they pull. Because most of oir teck guys become flaggers

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Jake Morgan
Well, without sitting down and drawing a detailed diagram, lets just simplify and do some basic math (I know all the points are not in the same horizontal plane, but that requires a little more work and I think you’ll see you still get similar results):

- Max wheel base from rear axle to front axle is 114”
- Min drawbar length is 18” from rear axle to hitch point

114”/18” is ratio of 6 1/3 to 1. Meaning to raise the drawbar 1” you would need to drop the front of the tractor down by 6 1/3”. It seems to me that most people would notice if someone tried to drop the front of their tractor a half a foot.

Here’s one other thing to consider: the ski bars that are mandated by both NTPA and PPL are 4” off of the ground and must be attached to the chassis and not the suspension. Meaning… if you tried to drop the front down the most you could gain would be ½” of drawbar with your ski bars right in the dirt.

As a side note: I spent some time at the NFMS talking with Brad Moss from the Young Buck team about their front suspension. I think their design is the nicest I’ve seen. It’s clean, engineered extremely well, looks great, and takes some stress out of the chassis. It’s also the only air-ride setup that has independent front suspension. If I was building a tractor I’d definitely use the Young Buck tractors’ front end as my benchmark. If anyone gets a chance this summer they should check it out, it’s as beautiful and clean as the rest of the tractor. I also got a chance to see under the hood, and it’s as clean or cleaner on the inside, as it is on the outside.

Should there be a rule on ski bars? No. They are just another innovation that some will adopt and some won’t. Is it going to make anyone go any further down the track? Most likely not even an extra inch. They are just another option, to some they are a novelty, and to some a necessity.

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Bob Barbee
I'm simply going address the mechanics of the issue.

Due to the short distance (18") of the Hook point behind the pivot point ( rear axle centerline), the drawbar can only move .300 of an inch in height. Keep in mind this is from Maxed out air pressure with nose higher than a Puller would actually run his vehicle, to the ski bars on the ground (literally sitting in the dirt) lower than any Puller would actually run his vehicle, so to this point you actually have a window of approx. 3/16 (.188) of an inch that is useable to alter drawbar height! These are actual measurements of what the Tractors real world do, not my cad drawings which show approx. .450 total possible movement, which we are not achieving. These numbers have been verified at multiple locations on multiple vehicles by both head Tech officials of both organizations. And my input as a builder was not requested at the Urbana meetings. Also with coil over shocks in place, if a competitor sets drawbar with 300lbs on back of tractor then before running moves that weight to front of Puller, you just achieved the same effect this ruling is addressing!


Bob Barbee (Stormy) NTPA #1535,(Willy Makit) NTPA# 2920
Full Pull Motorsports

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Bryan Lively
Think about hitch height in this manner:

Picture a tractor with a 114 inch wheelbase, and an imaginary level line that starts at centerline of the front axle and ends at 114 inches past the rear axle centerline. The centerline of the front axle is also 20 inches in height off the ground, for the sake of illustration. To get a 2 inch change in "hitch height," you'll have to lower the front axle 2 inches to see two inches of change, and that extra two inches of hitch height can only be observed at one spot--114 inches PAST the centerline of the rear axle.

Who runs an 8 foot hitch?

Where your rear axle is the pivot point, 18 inches beyond that in simple mathematical terms cannot possibly create a two inch change from a two inch alteration of height at the front axle. Just think of a teeter-totter and the relationship of one end (hitch point) to the other (front axle centerline). This is as simple a means to explain it, and with most LSS guys at 18 inches of height its hard to make any argument for a hitch going past 20 inches, even with the skids on the ground. A teeter-totter has a 1:1 relationship in height change from one end to the other, and this is no different. Two inches of change on the front axle equals, at 57 inches behind rear axle centerline, a 1 inch variance. 28.5 inches behind rear axle? Half-inch. Does this clear the air enough, especially when the tires are off the ground during a hook 6-12 inches? The working hitch height of a LSS in motion is going to be in the neighborhood of 17.75 inches with a static height of 18 inches. Don't take up the argument with me, take it up with a tape measure, a teeter-totter and math laws.