RTI ramp scores

30*

According to that my TJ scored a whopping 1570. Not to shabby Huh

My measurement was 73" Quadna what was my score :question:

sorry fellas - false numbers. that link utilizes direct vertical measurements to your tire whereas BBD measure ramp travel of the tire instead.
chris

Quote from "XJ99"

what degree is our clubs RTI ramp? Im tryin to figure out my score....

I did 42"

and I believe my wheel base is 101.4

413.79 is the score i came up with.

Quote from "BDLSTOY"

My measurement was 73" Quadna what was my score :question:

781.58 would be your score then. those 33" tires paid off

Quote

BDLSTOY wrote:

My measurement was 73" Quadna what was my score

781.58 would be your score then. those 33" tires paid off

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Thanks Chris.

I thought it sounded awfully high

There's some RTI info Here

this is how i've always interpreted the measuring.

you run a tape at a perpendicular line from the ramp's surface until it intersects the wheel's centerpoint. that distance at which it crosses the ramp is where you mark the tape measure. in my highly elaborate MS Paint drawing (:)) you can see that what i thought we measure from is in green...but i saw people measuring from the point that i marked in red. can anyone pipe up if they know differently? i know that ramp scores don't mean much...but it would be nice to know if we are doing things right with our own ramp.
chris

Based on the post by Keith, my score (54") works out to be about a 642.

Chris' equation makes sense since it takes the angle into effect.

I guess there is not RTI standard measurement method.

That's right. I think Quadna's method is more accurate. To calculate the height of your tire on the ramp you would multiply:

Tan 30 x wheel radius = correction factor

then:

((sin 30 x distance traveled) - correction factor) / Wheel base x 1000

Tan 30 = 0.577
Sin 30 = 0.5

So for me:

(((0.5 x 54") - (0.577 x 16)) / 84) x 1000 = 211

I think that is right.

damn.....I like the other way of calculating better!

Quote from "Slimer"

That's right. I think Quadna's method is more accurate. To calculate the height of your tire on the ramp you would multiply:

Tan 30 x wheel radius = correction factor

then:

((sin 30 x distance traveled) - correction factor) / Wheel base x 1000

Tan 30 = 0.577
Sin 30 = 0.5

So for me:

(((0.5 x 54") - (0.577 x 16)) / 84) x 1000 = 211

I think that is right.

damn.....I like the other way of calculating better!

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Errr...you're taking that one step too far. I think Chris was pointing out the difference in where the red and green lines intersect the ramp. By your calculations you'd need to lift your front tire 84" off the ground in order to score a 1000...in other words you'd need to go 14 feet up a 30 degree ramp!

You just need to use your correction factor and you can figure the difference between the two types of ramp score.

Knowing that the difference between the two types of measurements on a 33" tire is 9.52" you can easily calculate that with an 84" wheelbase the scoring difference would be 113...so if your 54" measurement was the "red" way then you should add 113 to the 642 making your score 755...

--Ian