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Length of Drawbar

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Jim

02-04-2002 05:42:29




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I am preparing to pull in antique farm stock (I think that is what it is called) 5000 or 5500 class. The question I have is why some pullers use an extra long drawbar? Minimum length is 14 inches from the end of the PTO shaft and a maximum of 16 inches high. This is by the way the standard length for most PTO driven equipment. If it helps, my question is in regard to Farmall M's which is the model of tractor I am preparing for spring 2002.

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Jim M

02-08-2002 18:07:18




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
You'll have to experimint. Depends on the sled set-up, length of chain and track bite. Keep moving weight from the front to the back and then going to a longer drawbar until the front comes up and then go back the other way a little to keep the front down.



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Tom

02-05-2002 07:34:48




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
For a given pulling chain length, a higher drawbar and longer drawbar will result in more weight on the rear wheels. However, once the the front end lifts, the limits of weight transfer will have been reached. When the front end lifts, the hitch point moves downward which causes the vertical force component on the hitch that is produced by the tension in the chain to be reduced. No voodoo in this. It's simple statics. Probably the optimum approach would be to just have the front wheels kissing the ground when you run out of power and/or traction.

In our club, the hitch point can be as close as 12" from the rear axle and no more than 21" in height. The 12" rule is, I am sure, to allow the pre 1960 JD's to keep their front ends on the ground (as well as a few other models) since this area is big time JD country.

Of course adding flux boosting magnetic resonance coils in each of the rear tires in an annular sense will also dramatically improve traction since they focus and increase the gravitational effect of the rear end--particularly if the Bouguer anomolies for dirt are not present.

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BJ

02-04-2002 12:17:35




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
By the way don't know about your club but most clubs that I know of require you to have a working PTO on antique farm stock tractors if they came from the factory equipped with one and the most common rule I have run across is 18" back from center of axle and 18 or 20 inches high



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BJ

02-04-2002 12:12:31




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
Well crap looks like somebody found out about my secret weapon I suppose one thing in my favor at least on my G is that I don't have to run a right angle gearbox on the dynamic induction coils



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phil

02-04-2002 07:53:04




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
Jim, our antique pulling club uses the 18" & 20" rule - the drawbar at the hitchpoint can be no shorter than 18" from the centerline of the axle, & the drawbar can be no more than 20" above the ground.



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G Taylor

02-04-2002 07:50:02




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
The higher the drawbar and/or shorter the chain more sled weight is carried on the tractor for traction instead of dragging on the ground. The longer the drawbar the more weight is levered off the front wheels onto the back. Heavy front ends & poor grabbing rear tires on loose tracks require more length. Just changing rear tires increased the traction so much the 435's drawbar is now in it's shortest hole instead of the longest. Used to spin out at mid track, now lifts the front wheels as she spins out at the far end. A long drawbar however bends to some degree & lowers the hitch height.

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JACK

02-04-2002 20:11:05




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 Re: Re: Length of Drawbar in reply to G Taylor , 02-04-2002 07:50:02  
IF THE DRAWBAR WAS LONGER AND TOOK WIEGHT OF THE FRONT WHEELS, WOULDN'T THAT PUT LESS WEIGHT ON THE REAR WHEELS, COMPARED TO KEEPING THE FRONT END DOWN AND THE SLED PUTTING WEIGHT ON THE REAR
WHEELS? WHAT DO YOU WHAT THE FRONT TIRES TO DO NEAR THE END OF THE PULL? STAY DOWN, OR JUST FLOAT ALITTLE? I AM JUST STARTING IN PULLING.



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G Taylor

02-05-2002 07:33:44




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 Re: Re: Re: Length of Drawbar in reply to JACK, 02-04-2002 20:11:05  
At the end of the track in 1st place of course, as she spins out there should be about 1lb of weight on the front end with the wheels still on the ground. When the front lifts, the drawbar goes down.



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435 ha

02-04-2002 09:37:54




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 Re: Re: Length of Drawbar in reply to G Taylor , 02-04-2002 07:50:02  
Why would anybody pull a 435. ARe you trying to gut the rearend out. THe ring gear and pinion can't take what that 2-53 will put out.



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435 Joke Deere

02-04-2002 20:33:45




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 Re: Re: Re: Length of Drawbar in reply to 435 ha, 02-04-2002 09:37:54  
I second what the guy above me said. And those tractors have no torque anyways, all they have is a really low gear goin for them. My International 240 has shown them how it is before and will continue forevermore. I have spun that thing out farther down the track than where they ran out of power and I had more weight. They are a real trip.



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G Taylor

02-04-2002 11:11:56




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 Re: Re: Re: Length of Drawbar in reply to 435 ha, 02-04-2002 09:37:54  
Because it's fun winning in the 4500lb class. R&P life is fine with clean Amsoil Racing series 2000 synthetic gear lube. Being lightly ballasted instead if weighing 6500lbs helps as well. The real secret however is the right angle inversion field coils hidden in the rear tires coupled to the dynamic induction coils attached to the flywheel.I actually leave the transmission in neutral & control the neutron flux to vary the torque applied to the rear wheels.

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Har Har!!

02-04-2002 13:05:56




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 Re: Re: Re: Re: Length of Drawbar in reply to G Taylor , 02-04-2002 11:11:56  
That's a good one G Taylor!! I was thinking of matter-antimatter generator inside the rear wheels myself but your inversion field coils would be cheaper, and safer too.



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farmall flogger

02-05-2002 14:27:51




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 Re: Re: Re: Re: Re: Length of Drawbar in reply to Har Har!!, 02-04-2002 13:05:56  
Does Denny's Carb Shop sell those inversion feild coils and antimatter devices? Sounds like a good program to get on.



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Dear Jim

02-04-2002 07:39:44




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 Re: Length of Drawbar in reply to Jim, 02-04-2002 05:42:29  
Pulling tractors don't have PTOs. Or at least many of them don't. The most common standard is 18" back, 20" up and down. There are parts of the country that are outside of that standard but is the most common.



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Is there a standard max length

02-04-2002 22:08:14




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 Re: Re: Length of Drawbar in reply to Dear Jim, 02-04-2002 07:39:44  
All pulls have a max drawbar height, but is there a maximum distance from the center of the axle for length?



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KEN

02-05-2002 19:21:26




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 Re: Re: Re: Length of Drawbar in reply to Is there a standard max length, 02-04-2002 22:08:14  
I have never seen a max drawbar length . the best pulling tractor never pulled the wheels but the front tires never left a track. I keep working for that.



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