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How do you calculate breakover angle

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]

Archived
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:
 
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.

 

JedA [JU]

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


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

Jeffery [JU]

Archived
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.
 
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]

Archived
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.
 
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