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Old 28th March 2008, 10:39   #1
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Default What is "Ramp Breakover Angle"

These days the 4x4 advertisements mention a lot of technical details and one such detail is the ramp breakover angle. I was wondering what this is and how does it help?

I can understand the angle of approach & the angle of departure angle adn it's relevance for a 4x4, but can't seem to understand the ramp breakover angle -- the included & excluded angles seem to confuse me.

Can someone help in explaining in a language that can be understood by common folks?
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Old 28th March 2008, 10:57   #2
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This is a measure of a vehicle's ability to drive over a sharp ridge or ramp without touching its underside. The "included" angle measures the angle inside the ramp; the "excluded" angle measures the combined angles outside the ramp to the horizontal. A short-wheelbase vehicle with a high ground clearance and large tires will have the best (highest) ramp breakover angle.

Of course I googled it and found out. HTH.

And please check this link, it has a picture.

Ramp Breakover Angle on carlist.com

Last edited by Rehaan : 28th March 2008 at 13:14.
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Old 28th March 2008, 11:15   #3
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Quote:
Originally Posted by clevermax View Post
This is a measure of a vehicle's ability to drive over a sharp ridge or ramp without touching its underside. The "included" angle measures the angle inside the ramp; the "excluded" angle measures the combined angles outside the ramp to the horizontal. .....
Buddy, I have seen this and the picture also -- had checked this before posting the question here.
  • What is angle inside the ramp?
  • What is combined angles outside the ramp to the horizontal
Sorry, but was never good at geometry..
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Old 28th March 2008, 11:19   #4
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Name:  rba.jpg
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Hope this explains the included angle and the excluded angle...
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Old 28th March 2008, 15:09   #5
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^^Good explanation.
Btw, This thread should be present in the 4x4 section.
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Old 28th March 2008, 17:01   #6
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Quote:
Originally Posted by nitrous View Post
^^Good explanation.
Btw, This thread should be present in the 4x4 section.
doesnt those angles valid to other vehicles viz passenger cars, goods vehicles (oh! btw, there are 3 wheeled vehicles as well which carry goods and passengers)

Also, we can include the "gradient angles" in this discussion.

@clevermax, good work there. That was really clever.
can you also put up a diagram showing the gradient angle?
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Old 28th March 2008, 19:55   #7
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Quote:
Originally Posted by nitrous View Post
^^Good explanation.
Btw, This thread should be present in the 4x4 section.
Quote:
Originally Posted by kkr2k2 View Post
doesnt those angles valid to other vehicles viz passenger cars, goods vehicles (oh! btw, there are 3 wheeled vehicles as well which carry goods and passengers)

Also, we can include the "gradient angles" in this discussion.

@clevermax, good work there. That was really clever.
can you also put up a diagram showing the gradient angle?
Thanks!
I don't know exactly what is gradient angle, does it indicate the angle of the chassis with the horizontal?
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Old 28th March 2008, 20:20   #8
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This site may give you details on the significance of not only 'Ramp Breakover Angle', but many other too.
The page does have the description too.
Rick's Buggy Project - Design Overview

Rgds,
SK
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