Posted by jwal10 on August 30, 2009 at 08:04:33 from (71.222.2.13):
In Reply to: Re: BIG Tires posted by Hugh MacKay on August 30, 2009 at 01:53:04:
Why do you think they put big wide tires on drag racing cars? Tire speed and more tire contact on the pavement. The bigger around and wider the tire is the more ground contact. That is why radials get better traction, more ground contact. Old AC tractor pullers put big 38" rubber on instead of the little 28" tires. All tractor pullers want more ground contact and as much weight on the rear as they can without losing the high hitch advantage when the front tires come up. A 18.4x 38 or even a 16.9x38 tire has a lot more ground contact then a 15.5x 38 tire. You don't see pullers run 15.5x38's, even Farmall M's now run 18.4x38's. A 706 came out with 18.4x34 but 14.9x38 duals got a lot more traction especially when seperated by 8-12" on a non weight transfer pull like a disk or cultivator. My brother pulls a 1466 with 20.8x 38 tires with axle duals both loaded and a lot of weight and with the screw turned up it will out pull his 1566 with single 20.8x38's, same horsepower, same total weight, same pulling track, he loses traction on singles. It is all about weight transfer and ground contact. The hitching point on the tractor is high and low on the sled so it puts weight on the back of tractor trying to lift the front. Kind of like pulling a 3 pt. subsoiler, you need duals to keep from digging in and spinning and front weight to keep the front from coming up. Heavy pull, duals will work better with more weight transfer. A lot of big heavy weight, pulling tractors that run in the slow pulls run duals, but high horse power, low weight tractors need big wide tires and wheel speed.
2 different things your cultvator needed speed and had no weight transfer. Slow tractor pulling is all about weight transfer and ground contact.
Did you run the tractor with chloride and duals? It would have pulled more on a heavy load. Your cultivator was a straight pull no weight transfer, it needed ground contact to float. I had a 4240 JD, came with 18.4x38 bias tires with calcium, I ran duals for breaking down ground with heavy 20' harrow, 20'disk and pulling a 14' grain drill with a 14' rollerharrow in front. I needed ground contact and needed to keep the tractor up on top of loose ground. I would run 1 dual when plowing in the furrow and 2 if on land. If a little greasy the in furrow plow gave down draft and would work better. On land had no downdraft, had to have duals and a lot of weight dry or wet. I went to radials, no calcium. Worked for plowing in the furrow but for the rest it wasn't worth a damn, bounced all the time, added all axle weight to make up for calcium weight, still no good, removed weights and put calcium back in, tractor ran smooth and pulled in 5th gear powershift. Every situation is different, but the constant is weight and ground contact. More weight, more ground contact, more pull. Now a narrow tire that will dig in on a hard surface and find traction with weight transfer can outpull duals with no weight transfer that just spin on top. It used to be old tractors had low horsepower but lugging ability so they ran slow and dug in. 20 horse JD BR or W-4 IHC with 10x24" tires, full of calcium pulled 2 bottoms at 2 miles/hr on a pull plow with weight transfer and no weights. Now, new tractors need wheel speed and need to stay on top. No weight transfer so they have triples on the back and duals on the front to get traction to pull 24 row planters and 60' cultivators at 8-10 miles/hr. If you take that same tractor, you can't pull an onland plow that fast and if you try you need 30-40 horses per bottom at 6 miles/hr....James
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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