Torque multiplication

john in la · Mar 8, 2023

How do you figure torque multiplication on a radius.
Such as a cheater pipe.

With and estimated 2 foot rise and set back about 2 foot that looks to be about a 4 foot radius from where the trailer
hooks to where the class 3 hitch begins.
Using a 4 foot radius I got to believe the tongue weight force has to be 4 to 5 times normal tongue weight especially in a
take off or stop situation.
Best part is he will be scratching his head trying to figure out what happened when this setup rips that class 3 hitch
right out from under that truck.

Tony in SD · Mar 8, 2023

That would be a good problem for a high school physics class to calculate.

showcrop · Mar 8, 2023

a squared plus b squared = c squared, so you radius would be approx. 2.85 not four feet. can't help you with torque multiplication though.

BarnyardEngineering · Mar 8, 2023

2 feet up and 2 feet back is just shy of a 3 foot lever arm. It's the direct distance from the point of force to the fulcrum to calculate torque.

I'm also thinking the distance would originate at a theoretical "stock" hitch ball, which would be on a 2" drop shank. So in reality it's a bit closer than 3ft.

Still going to put a lot of torque on the receiver.

UncleTom · Mar 8, 2023

If he will over do it on the hitch, i wonder how over do will he load it?

ihplowboy · Mar 8, 2023

Safety chains for when it breaks ???
J

DoubleO7 · Mar 8, 2023

He is just dragging it home from the auction, empty.

Steve@Advance · Mar 8, 2023

The added leverage is bad enough, and just because it held this time, or 6 months, or a few years, there has to be a measure of flexing going on there!

When will that first unnoticed broken weld happen? That small crack in the frame where the hitch is bolted? The internal stress crack where the brake press was used to form a bracket?

Things will go downhill rapidly at that point!

JMOR · Mar 8, 2023

(quoted from post at 16:05:34 03/08/23) 2 feet up and 2 feet back is just shy of a 3 foot lever arm. It's the direct distance from the point of force to the fulcrum to calculate torque.

I'm also thinking the distance would originate at a theoretical "stock" hitch ball, which would be on a 2" drop shank. So in reality it's a bit closer than 3ft.

Still going to put a lot of torque on the receiver.

hat you said plus the force is not being applied at right angle to the 2.8 foot radius arm, thus reducing the torque.

Geo-TH,In · Mar 8, 2023

Jessie,
The added torque arm is not C, the hypotenuse.
The added torque arm is the x distance from where the ball
attached to the old receiver.
Torque is the force perpendicular times the x distance.
HS physics.

Mike(NEOhio) · Mar 8, 2023

2 ft. up and 2 back 2.83 ft. on a line from the ball through the center of the cross tube of the hitch which is where the torque is applied. That's 45 degrees from horizontal. The actual load applying the torque is the tongue wt. X .707 because the effective force is applied by the percentage of the load that is perpendicular to the 45 degree line. BUT....that will also fluctuate with acceleration and braking.

showcrop · Mar 8, 2023

(quoted from post at 15:29:04 03/08/23) Jessie,
The added torque arm is not C, the hypotenuse.
The added torque arm is the x distance from where the ball
attached to the old receiver.
Torque is the force perpendicular times the x distance.
HS physics.

You were sick that day?

JMOR · Mar 8, 2023

(quoted from post at 19:00:50 03/08/23)

(quoted from post at 15:29:04 03/08/23) Jessie,
The added torque arm is not C, the hypotenuse.
The added torque arm is the x distance from where the ball
attached to the old receiver.
Torque is the force perpendicular times the x distance.
HS physics.

Click to expand...

You were sick that day?

K to explain , but no need to slap Geo.

rustred · Mar 8, 2023

Well if we had the whole picture to look at might get a better answer. When that trailer is hooked up like that it might be all balanced. and it will take little effort in that hitch to pull it. Looks good to me. Plus I am taking it as an empty unit. No load.

JMOR · Mar 8, 2023

(quoted from post at 19:22:24 03/08/23) Well if we had the whole picture to look at might get a better answer. When that trailer is hooked up like that it might be all balanced. and it will take little effort in that hitch to pull it. Looks good to me. Plus I am taking it as an empty unit. No load.

ot to mention that it is unlikely that anyone of the posters knows what the limiting torque number is that would result in damage, safety, destruction. So why worry about a number that will be meaningless even if calculated absolutely perfectly?

rustred · Mar 8, 2023

Exactly. Soon as something is posted out of the ordinary
there is hands in the air before the brain kicks in. I can
look at something and say either yes or no. Its just an
empty wagon.

caterpillar guy · Mar 9, 2023

Looks like on of those old Military trailers. those had the tongue high to fit with the old 6x's. I'm guessing he is pulling it home empty or not much in it and is no foul. If it is an old military trailer they would not pull good angled down to a pickup hitch when he went over humps and dips. A federal case out of nothing.

Torque multiplication

john in la

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Tony in SD

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showcrop

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BarnyardEngineering

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UncleTom

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ihplowboy

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DoubleO7

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Steve@Advance

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JMOR

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Geo-TH,In

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Mike(NEOhio)

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showcrop

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JMOR

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rustred

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JMOR

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rustred

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caterpillar guy

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