How do you calculate breakover angle

[Round Rock TJ [JU]]

I need the formula. I need to find the breakover angle if you know the wheelbase, tire size, and ground clearence. Any geometry guys out there?
Thanks

 

[Jeffery [JU]]

To do it effectively you need to calculate the center of gravity of your individual Jeep, no two are the same.

 

[Round Rock TJ [JU]]

To do it effectively you need to calculate the center of gravity of your individual Jeep, no two are the same.

Why, what does COG have to do with breakover angle? I do not understand. It is a geometry question, not a physics question.
Thanks

 

[Jeffery [JU]]

Why, what does COG have to do with breakover angle? I do not understand. It is a geometry question, not a physics question.
Thanks

No it is not :bangnerd: It IS a physics question and a geometry question. Once the COG reaches an angle of greater than 90 degrees over the normalized plane, you flip, and that is your breakover angle.


As stated before, no two Jeeps COG's are the same, especially with your fatazz in the seat :bangnerd:

 

[Round Rock TJ [JU]]

You have the wrong breakover angle. You are thinking flip over angle. Google breakover angle and you will see. It is a common spec for cars. A larger breakover angle will allow one to run over bigger rocks and ledges without hitting bottom.

 

[HappyHumidor [JU]]

With a calculator, of course. Though a spreadsheet program can do a nice job, too.

Oh, and j00 suX0rS @ teh innarwebthingie.

 

[JedA [JU]]

tan^-1 (ground clearance/half the wheelbase)


I don't think tire size matters other than changing your ground clearance.

 

[Jeffery [JU]]

You have the wrong breakover angle. You are thinking flip over angle. Google breakover angle and you will see. It is a common spec for cars. A larger breakover angle will allow one to run over bigger rocks and ledges without hitting bottom.

In that case the breakover angle would be the inverse tangent of your clearance (distance from the ground to the transfer case, divided by 1/2 the wheelbase.

 

[Nadeaux [JU]]

What would be the benefit of knowing your breakover angle? Does it give you more e-cred for your web-wheeling?

 

[Round Rock TJ [JU]]

What would be the benefit of knowing your breakover angle? Does it give you more e-cred for your web-wheeling?

I want to know for something off topic from jeeping and automotive. I thought I would ask here because breakover angle is used in jeeping and automotive.

 

[Jeffery [JU]]

You got your answer, go away now

 

[ABQ-TJ [JU]]

Go to jeepaholics.com and fill out the rig rater...I think break over angle is one of the results.

 

[Round Rock TJ [JU]]

tan^-1 (ground clearance/half the wheelbase)


I don't think tire size matters other than changing your ground clearance.

Thanks but tire size does matter. If I was at home I could draw you a picture to show you why. But you are not taking the top line of the triangle down to the ground right under the axel (wheelbase). You are taking that line down to the ground where your contact patch ends in this application. In some applications it is even further back than the contact patch.

 

[JedA [JU]]

Thanks but tire size does matter. If I was at home I could draw you a picture to show you why. But you are not taking the top line of the triangle down to the ground right under the axel (wheelbase). You are taking that line down to the ground where your contact patch ends in this application. In some applications it is even further back than the contact patch.

I can see why that is, but if you are trying to get it that accurate then tire size is too inexact. If I have 36" tires with 30 psi it's going to be very difference from when it has 6 psi.

Take a tape measure, measure your actual distance from contact patch to contact patch and use that in place of wheelbase.