Traction old vs new - it's not always hp - interesting video
- Thread starter sbakf
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k0ua
Epic Contributor
Looks like the JD was making a pretty fair tiller with those rear tires churning up the soil.
Baby Grand
Elite Member
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- Kubotas: L3240GST B2320HST B5100D & G5200H
Looks like the JD was making a pretty fair tiller with those rear tires churning up the soil.
Looked like he was digging to China. Although the chain was tipped in the steamer's favor, the fact that the steamer was wearing sneakers to the JD's lugged hiking boots brings things back in balance somewhat. I really enjoyed watching that - thanks for posting it, sbakf.
Are we just having a disagreement over semantics? Okay a lack of torque isn't a factor in the JD's performance. But torque is a factor in the drag competition as a whole. The steamer is able to pull the JD because its product of torque and traction. Forward pulling force in this case is a product of two factors. One of those factors is torque.
Saying that torque is not a factor is wrong. If you want to say that a lack of it is not a factor in the JD's performance I'll accept that.
RaydaKub
Veteran Member
The steamer is sunk into the tracks toward the end while the tractor is back on top and the chain is about level. Still no contest. Nor would the 4wd help much. There just isn't enough weight to hold down the hp.
Torque is certainly required, or there would have been no contest to begin with. But both tractors had plenty of torque relative to other factors, namely traction. So the differing amounts of torque produced by the two was not a factor in the outcome. Thus all the silly discussion on Youtube about how much torque the old tractor was just irrelevant. If the JD had more traction (lots more) relative torque output might have been a factor, but as it played out, it wasn't at all.
Terry
grm61
Platinum Member
I agree, I believe the outcome would have been the same even if the Deere had 4WD, the 4WD likely did not work because of the mods to the drivetrain.
I am sure the steamer out weighed it by a bunch....hence no contest.
adventure bob
Platinum Member
1. Please explain from a physics perspective why the "angle of the chain" has a thing to do with it? It has absolutely zero play in the equation.
2. Torque is THE only thing that matters in engine output. Remember that horsepower is derived form an equation with Torque as an input variable. Remember that HP=Torque*RPM/5252.
3. Weight is a considerable factor in the vector of travel for two vehicles tied together. That steamer outweighs the JD prbly 5 to 1.
There was no way the JD was gonna win that one nor was it surprising that it lost.
2. Torque is THE only thing that matters in engine output. Remember that horsepower is derived form an equation with Torque as an input variable. Remember that HP=Torque*RPM/5252.
3. Weight is a considerable factor in the vector of travel for two vehicles tied together. That steamer outweighs the JD prbly 5 to 1.
There was no way the JD was gonna win that one nor was it surprising that it lost.
Pulling upwards a bit removed some weight from the JD rear wheels.
I have a 4 wheel garden cart about like this.
When I pull it by hand up my sloped driveway, the front wheels often come off the ground. If those were drive wheels trying to pull the other way, they would have no traction.
Bruce
adventure bob
Platinum Member
Pulling upwards only applies if the angle of the vector is increased during the pull. There was no change in the angle of the chain during the event and therefore no impact on the traction of the JD. If the steamer changed angle at the hitch during the pull then it would matter but the pull remained the same throughout and therefore its net effect is zero.
