Center of Gravity
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hook a strap to the top and pull on it till it tips over then you will know
did this to s stocker we were parting out yesterday it was unbelieveable it allmost seemed like the fenderflares were going to hit the ground before it went over wish I had my camera
but seriously I would say use a beam under two tires and a fork lift to raise the beam I would safty strap it to the forklift so once it starts to go it doesnt continue
did this to s stocker we were parting out yesterday it was unbelieveable it allmost seemed like the fenderflares were going to hit the ground before it went over wish I had my camera
but seriously I would say use a beam under two tires and a fork lift to raise the beam I would safty strap it to the forklift so once it starts to go it doesnt continue
Oddly enough I have access to a fork lift and I might do just that. When I finished the last suspension project I did kind of use it as an automatic rti ramp. Same principle here I guess.
This is a pretty stupid question isn't it. I was really hoping for a more technical solution to answer this question, you know like, "if you have x amount of weight above your frame and y amount below it you COG is at z distance over/under your frame...
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" but there probably isn't one, so this will do fine.
Thanks for the info,
F_T
This is a pretty stupid question isn't it. I was really hoping for a more technical solution to answer this question, you know like, "if you have x amount of weight above your frame and y amount below it you COG is at z distance over/under your frame...
Thanks for the info,
F_T
There is a method to determin CG, but most people won't have the tools scales and such to to it. I'm
pretty sure I have a book at home that spells it out.
I wouldn't try the forklift trick. I think if you got it high enough to start to go over, it would, even if that
meant sliding under the forks...
pretty sure I have a book at home that spells it out.
I wouldn't try the forklift trick. I think if you got it high enough to start to go over, it would, even if that
meant sliding under the forks...
There are 3 major calculations to determine the CG. Keep in mind there is also the probability that the CG
is NOT on the centerline along the length of the chassis. This is due to the passenged side offset of the
driveline, battery gas tank, etc. This is partially offset by the drivers weight. BTW make sure the driver is
in the rig to find the true asdriven CG. Also not that the CG will move forward as the fuel tank goes from
full to empty and will change as you carry loads, espesially if ti's on top or rear cargo racks.
Its going to take a set of 4 scales, one for each wheel. Since almost no one is going to have those 4
scales, I'll stick to the basic methodology, and skip the algebra needed to complete the calculations. If
anyone is serious about measureing the CG, I'll scan and post the diagrams, with the algebra and trig
equations.
Basically you weigh the vehicle flat, and note the weight on each tire. With these weights you can then
caculate the CG location front to rear, and side to side.
You still need the CG height, and that where it gets interesting.
The vehicle is lifted a distance on the front or rear, and weighed again at each corner, again noting the
corner weights. Then using the result fron the front to back dimension of the CG and a bit of trig,
you can solve the equations for the height of the CG. This is possible by determining the change in weigth
front to rear, from flat to lifted weights.
Sound like fun? Worry not. focus on keeping the weight low, and it will minimize the risk of going over center.
once the CG has passed the tire contact points, your done. Its on its side or head. Of course that is
assuming a slow crawl. at speed its much different and a much lessor angle to go over.
is NOT on the centerline along the length of the chassis. This is due to the passenged side offset of the
driveline, battery gas tank, etc. This is partially offset by the drivers weight. BTW make sure the driver is
in the rig to find the true asdriven CG. Also not that the CG will move forward as the fuel tank goes from
full to empty and will change as you carry loads, espesially if ti's on top or rear cargo racks.
Its going to take a set of 4 scales, one for each wheel. Since almost no one is going to have those 4
scales, I'll stick to the basic methodology, and skip the algebra needed to complete the calculations. If
anyone is serious about measureing the CG, I'll scan and post the diagrams, with the algebra and trig
equations.
Basically you weigh the vehicle flat, and note the weight on each tire. With these weights you can then
caculate the CG location front to rear, and side to side.
You still need the CG height, and that where it gets interesting.
The vehicle is lifted a distance on the front or rear, and weighed again at each corner, again noting the
corner weights. Then using the result fron the front to back dimension of the CG and a bit of trig,
you can solve the equations for the height of the CG. This is possible by determining the change in weigth
front to rear, from flat to lifted weights.
Sound like fun? Worry not. focus on keeping the weight low, and it will minimize the risk of going over center.
once the CG has passed the tire contact points, your done. Its on its side or head. Of course that is
assuming a slow crawl. at speed its much different and a much lessor angle to go over.
I think the page you guys are looking for is right here:
http://www.jeepaholics.com/tech/cog/
If you guys want that in a more permanent form, I can turn it into a pdf with live links and all.
and outlaw, what are you using to edit your text? It ends up with really weird line breaks on my screen.
Kevin
http://www.jeepaholics.com/tech/cog/
If you guys want that in a more permanent form, I can turn it into a pdf with live links and all.
and outlaw, what are you using to edit your text? It ends up with really weird line breaks on my screen.
Kevin
Sorry about the line breaks Kevin, I use a hard return at the end of the window space. otherwise the lines
go full length on the posts. If your screen width is narrow it will get choppy. I'm full width on my Ltop screen
so its not too wide, but may be wider than what your using.
Good CG site kev. Had to post that AFTER I did my scanning didn't you?
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Oh well for what its worth, here it is: Dang, It's unreadable when small enough to see.Hmm
I'll crop it to 2 pics... This should be the view from the top.
No, I guess I wont! Down to 85 K and it wont take it, its too big? Whats up with that?.
I have it posted as a file in my group , use the link in my sig and go to "files" under basics 101.
go full length on the posts. If your screen width is narrow it will get choppy. I'm full width on my Ltop screen
so its not too wide, but may be wider than what your using.
Good CG site kev. Had to post that AFTER I did my scanning didn't you?
Oh well for what its worth, here it is: Dang, It's unreadable when small enough to see.Hmm
I'll crop it to 2 pics... This should be the view from the top.
No, I guess I wont! Down to 85 K and it wont take it, its too big? Whats up with that?.
I have it posted as a file in my group , use the link in my sig and go to "files" under basics 101.
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