Newbie

beatle · Aug 2, 2013

Reletivly new@pulling especially on a transfer sled and I just had a couple questions. First I heard a guy talking about draft and I'm thinking it has to do with speed and gears to pull in? I'm pulling in 2600 or 3000 and wonder if it is relivent for me. Also could someone explain advantage or disadvantage in relation to the length of the pulling chain.thanks

showcrop · Aug 2, 2013

Draft is what old timers (old pharts) call the downward component of the pull of the chain from the transfer sled to your draw bar. It is a major component of your traction and it is the reason why you want your draw bar to be as high as allowed. It is also what causes the front of your tractor to lift and what causes you to need weight on the front unless your tractor is front heavy already.

MMZAck · Aug 2, 2013

Ah grasshopper, first you must paint fence. Haha. Showcrop is correct, the draft is the downward force on the hitch. As chain length gets longer, the angle is reduced and the downward component on the hitch is reduced because the horizontal component increases. In other words, it takes less power to pull the sled as the chain length increases.

If you want to learn a lot in a short amount of time, check out the Antique Tractor Pull Guide. There is a whole chapter dedicated to hitch physics. See link below.

What kind of tractor are you pulling? I personally love the light classes and have pulled an Allis CA, Massey Harris Mustang and MM BF at various times at 3000#. I'm rounding up parts right now to build something unique...

Zack
Antique Tractor Pull Guide

beatle · Aug 2, 2013

Thanks for the response guys, I am pulling a 1943 allis c. Have had better luck so far in the 3000 as opposed to nearly barebones 2600.

north puller · Aug 2, 2013

I don't know if i would say that a long chain would make the sled easier to pull. As a matter of fact, i know that with everything else being equal, i can pull much better with a short chain.

A short chain gives you much more traction and helps you to lift the front of the pan.

now, when you get really great traction from a short chain, you will drive on until you find the end of your power.

showcrop · Aug 2, 2013

(quoted from post at 13:49:03 08/02/13) Thanks for the response guys, I am pulling a 1943 allis c. Have had better luck so far in the 3000 as opposed to nearly barebones 2600.

OK Beatle, now we can get into something really controversial!! About 90% of pullers will tell you that you should always, ALWAYS!!!! have your draw bar set to the furthest ahead point. However this is not true. In a situation where your tractor is "front heavy" you can effectively pull a good chunk of that front weight onto your rear wheels by sliding your draw bar out 2-5 inches depending on what you have for optional holes in your draw bar. What happens then is that the "draft" or downward force on your draw bar is now increased by the additional leverage of the additional distance between the wheels and the hitch point. Savvy pullers, mainly with lighter tractors, will use this trick to be competitive in their lightest class.

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