Need Help From The Math Wizards

Fulltimer · **Posted:** Sun Feb 24, 2008 2:56 pm

Here are some figures for my KJ:

Track width: 66" (also figure 69")
Height: 71"

Front of front tire to where the bumper would be if straight out: 13"
Ground to bottom of front bumper: 22"

What is my approach angle? What is my tip over angle?

I have been out of school WAY to long!

Terry

tjkj2002 · **Posted:** Sun Feb 24, 2008 3:00 pm

Fulltimer wrote:

Here are some figures for my KJ:

Track width: 66" (also figure 69")
Height: 71"

Front of front tire to where the bumper would be if straight out: 13"
Ground to bottom of front bumper: 22"

What is my approach angle? What is my tip over angle?

I have been out of school WAY to long!

Terry

The easiest way to figure approach and departure angles is get a big piece of plywood(or any other big flat piece of something) and shove it(try to) under your tires and then lift the opposite end until it stops(as if your making a ramp).Then have another person with a angle finder or protractor measure the angle,and then that is your approach or departure angle.No math involved.

Jeepjeepster · **Posted:** Sun Feb 24, 2008 3:09 pm

Just make a triangle and use ArcTan(o/a).

O=opposite=22"
A=Adjacent =13"

If your measurements are right and they are from the places I think they are it should be 59.4 degrees.

That tip-over angle would be impossible for me to solve given my physics skillz. I'd need to know COG and all that crap and even then I wouldnt know what to do with it.

1300ZUK · **Posted:** Mon Feb 25, 2008 1:05 am

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your ( * ) starts to pucker

Fulltimer · **Posted:** Mon Feb 25, 2008 4:29 am

1300ZUK wrote:

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your *#( . )#* starts to pucker

A lot of truth there!

Terry

Sir Sam · **Posted:** Mon Feb 25, 2008 5:20 am

1300ZUK wrote:

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your *#( . )#* starts to pucker

the engineer in the back of my head just wants to yell at you for using soh cah toa.

meh_kick · **Posted:** Mon Feb 25, 2008 7:43 am

Sir Sam wrote:

1300ZUK wrote:

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your *#( . )#* starts to pucker

the engineer in the back of my head just wants to yell at you for using soh cah toa.

[Nerd Alert]

If you can't remember the great Chief's name, Sohcahtoa, remember his wise saying:
Saddle Our Horses, Canter Away Happily, To Other Adventures.

[/Nerd Alert]

Also, you can take a picture of your rig and measure the angle / draw the triangle on photograph. Since the triangle made with the plywood in real life is dimensionally similar to the photograph, their angle measures will be congruent.

Fulltimer · **Posted:** Mon Feb 25, 2008 7:44 am

What ever! :lol:

Terry

kolesy · **Posted:** Mon Feb 25, 2008 8:00 am

WoW!!

Way to early on a Monday for the brain to be thinkin this hard!!! :shock:

jason thompson · **Posted:** Mon Feb 25, 2008 3:52 pm

The way I do it
approach angle = what you can get up with out damaging your rig (more for some and less for others)
tip over angle = when you think you are about to tip over you still have 5-10* more to go but still trust your "gut"
break over angle = go very very slow if the tires dont hit the ground before you bottom out pray you can back up or just take a strap the go at an angle and refer to tip over angle
departure angle = the same as approach angle most times more if you have a hitch

Incase you dont get it the numbers dont mean shait to me I go on what I can and can not do

1300ZUK · **Posted:** Mon Feb 25, 2008 9:17 pm

Sir Sam wrote:

1300ZUK wrote:

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your *#( . )#* starts to pucker

the engineer in the back of my head just wants to yell at you for using soh cah toa.

i are an engineer, i tried to put it in an easy to use manor

Jeepjeepster · **Posted:** Mon Feb 25, 2008 11:58 pm

1300ZUK wrote:

Sir Sam wrote:

1300ZUK wrote:

Fulltimer wrote:

Here are some figures for my KJ:

What is my approach angle? What is my tip over angle?

Terry

approach angle, easy, Rise over run, so if it goes up 14" and out 15" then take the inverse Tangent of 14/15, it should be the TAN-1 button on a calculator (the calculator on windows can do this if you switch it to Scientific)

tip over angle, is just after your *#( . )#* starts to pucker

the engineer in the back of my head just wants to yell at you for using soh cah toa.

i are an engineer, i tried to put it in an easy to use manor

Yea, thats the way we did it is the way I was always taught. I use that pretty much everyday in phy and statics. :evil:

DaveKJ02 · **Posted:** Tue Feb 26, 2008 12:31 am

Impressive thread. Pull out the slide rulers while I hook up the straps.

06BlueLimited · **Posted:** Tue Feb 26, 2008 6:29 am

I guess there is a little Urkle in everyone. :lol:

kolesy · **Posted:** Tue Feb 26, 2008 8:03 am

I can just see everyone wearin their pocket protectors!!!! :lol:

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