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OT. Engineering Problem

A

Anonymous-0

Well-known Member
In a recent discussion with some also enginering challenged friends we were discussing double trees, aka."eveners" as used in working horses. In the discussion it was said that if the center hole was off center the horse on the shorter side would have to work harder. It was assumed that all pivots moved freely and the two end holes were 40 inches apart with one being 18 inches from center and the other being 22 inches from center. I maintained that if the piece was kept perpindicular to the line of pull that the horse on the shorter end would have to work harder than the one onthe long end but if they pulled equally the piece would swing to an angle to the line of pull. Then the horse at the longer end would be walking ahead of the other horse. Can anyone answer using mathematical fornulas?
 
Horses just really dont care about math they just pull to their abality or maybe you have never seen horses work or driven a team .
 
I don't think they're offset. You would need to have a loadcell hooked up on each horse to measure the load they were pulling. Hal
 
Unless the angle reached a limiting point, the ratio will not change regardless of the angle. The horse on the short end will pull 55% of the load and the other 45%.

Areo
 
True, they don't know math all that well, but i have seen a lazy mule slack up enought to allow the other one to pull 75% of the load.
 
t=r x F The horse pulls with Force multiplied by the radial distance from the pivot point of the evener. Resulting in torque around the pivot point. So you "even up" unequal horses to get the equal pull by giving one some leverage against the other. But, if they are equal pullers, yes, the one with the longer side would then pull ahead of the other. That is unless the lazy yet strong horse sees the other pulling ahead and pulls harder to stay up. This is something that someone experienced in horse pulling would sometimes do to maximize his team.
 
Take it to the extreme - move the "center" hole 20" to the left. The left horse would be pulling ALL the load while the right horse would be along for the stroll.

I've worked with people like that, with me being the left horse, and the right horse leaning on the sledge.

I've got a couple double trees hanging out in the shed, left from my wife's grandpa's farming days. You've got me curious - I think the center hole is in the center, but now I have to measure it.

Paul
 
Like Areo says. It does not have to be perpendicular. Ratio still stays the same. I remember my dad drilling a new hole a couple of inches of center to give a young horse an advantage over the bigger horse. Now. would you guys like to try for the ratios of a triple tree?
 
The load splits according to the willingness of each horse to pull, or according to the motivation. I saw an 8 horse hitch summer ago where one front corner horse was only motivated to move by the tree hitting his legs from the rear. Didn't contribute at all, until a whip snapped on his rump.

Gerald J.
 
Interesting discussion, did they refer to some of them as whipple tree's also. Seem to remember dad saying something along those lines. When him and my uncles got together, rarely did a tractor discussion come up, horses and more horses.
 
The posters are right. Its the same as a teeter totter and the math is just the ratio of each length.

To the folks who say horses don't know math, maybe not, but they sure know loads and with an even hitch they can only pull as hard as the weaker horse.
 
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