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Steel Wheels and Pulling

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JWhite

01-22-2005 11:17:33

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With the 2005 pulling season about to start, I have been asked be a relative why most of the steel wheel era machines were on rubber. After explaining the cutoffs and smooth ride concept I started to wonder if there were any differences in steel and rubber in reguards to pulling.

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RAB

01-23-2005 03:27:48

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Re: Steel Wheels and Pulling in reply to JWhite, 01-22-2005 11:17:33

Whilst looking for something else, I came across Nebraska Tests #237 and #238 on an AC U and a UC, tested on both steel and rubber in the same tests. The differences are very apparent and while not directly appliccable to other models/makes, gives a good indication of the differences expected.
Eg fuel economy rose from 6.1 to 8.6 (or from 5.4 to 9)horse power hours per gallon when changed to rubbers.
Overall, though the tracklayer M (test #239) pulled twice as much load as the rubber tyred tractors.
Regards, RAB

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JWhite

01-22-2005 18:39:40

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Re: Steel Wheels and Pulling in reply to JWhite, 01-22-2005 11:17:33

Thanks, I think I will put my new B (skeleton) in a pull this spring just to say that I made the attempt.

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Don Wadge

01-22-2005 17:13:57

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Re: Steel Wheels and Pulling in reply to JWhite, 01-22-2005 11:17:33

Steel lugs for what ever reason do rob a lot of power. Whether it because it takes power pushing them in or pulling them out of the ground or if it's also due to the fact that they hold too tight when they have a good hold. Rubber is more forgiveing and might allow a little slippage while still pulling good. (Once steel slips you're done).

For what it's worth this is my experience. I used to do antique tractor pulling with a 1936 Model L Case on steel wheels. Won the first pull I went to using two rows of lugs on a hard track. I usually did quite well with that tractor but some tracks were a little soft for steel wheels. I put on a set of extensions with another row of lugs. With the 3 rows of lugs I would just power out way before I should have and it just wasn't a contender that way.

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Hugh MacKay

01-22-2005 15:20:29

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Re: Steel Wheels and Pulling in reply to JWhite, 01-22-2005 11:17:33

J White: Try pulling the same tractor on steel then change wheels to rubber and pull again. The rubber will outpull steel on the hard track. I even got a surprise watching an Oliver OC-6 crawler pulling against an Oliver 77 on rubber. The 77 beat him by three tractor lengths. (same engine)

You put them in the right conditions and watch the rubber go down to defeat.

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RAB

01-23-2005 02:44:09

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Re: Steel Wheels and Pulling in reply to Hugh MacKay, 01-22-2005 15:20:29

OK Hugh. Same horse power at the flywheel, but with all that track gear to drive, there are probably 20% less when the horses actually get to the ground! And, of course, momentum will play a large part in pulling - that rubber was probably flying along while the skid weight was low.
I do know that my Ollie 90 would not like to start from rest with spade lugs in top gear (It has the C66 gears) and she pulls really hard when you can get her in top on those spades!!
Regards, RAB

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Chances R

01-22-2005 11:55:42

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Re: Steel Wheels and Pulling in reply to JWhite, 01-22-2005 11:17:33

My Father always told me that it took alot of power to place the lugs in the ground, and to pull them out of the ground. For what it is worth we use to have a 1950 D John Deere that came from Arkansas with 36" of steel on each side. In the picture is my Dads 1937 Case CCS hi crop and my 1918 Aultman Taylor 30-60

my web site

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Bobcat

01-22-2005 16:37:05

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Re: Steel Wheels and Pulling in reply to Chances R, 01-22-2005 11:55:42

The problem with steel is that they don"t spin so when your rpm"s drop you are done. This is a Hart Parr 18-36 that only turns 800rpm"s.

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